feat(frontend): Merge dev into feat/assignment

backend/.env-old

@@ -0,0 +1,21 @@
+PORT=3000
+DWENGO_DB_HOST=db
+DWENGO_DB_PORT=5432
+DWENGO_DB_USERNAME=postgres
+DWENGO_DB_PASSWORD=postgres
+DWENGO_DB_UPDATE=false
+
+DWENGO_AUTH_STUDENT_URL=http://localhost/idp/realms/student
+DWENGO_AUTH_STUDENT_CLIENT_ID=dwengo
+DWENGO_AUTH_STUDENT_JWKS_ENDPOINT=http://idp:7080/idp/realms/student/protocol/openid-connect/certs
+DWENGO_AUTH_TEACHER_URL=http://localhost/idp/realms/teacher
+DWENGO_AUTH_TEACHER_CLIENT_ID=dwengo
+DWENGO_AUTH_TEACHER_JWKS_ENDPOINT=http://idp:7080/idp/realms/teacher/protocol/openid-connect/certs
+
+# Allow Vite dev-server to access the backend (for testing purposes). Don't forget to remove this in production!
+#DWENGO_CORS_ALLOWED_ORIGINS=http://localhost/,127.0.0.1:80,http://127.0.0.1,http://localhost:80,http://127.0.0.1:80,localhost
+DWENGO_CORS_ALLOWED_ORIGINS=http://localhost/*,http://idp:7080,https://idp:7080
+
+# Logging and monitoring
+
+LOKI_HOST=http://logging:3102

backend/Dockerfile

@@ -6,8 +6,9 @@ WORKDIR /app/dwengo
 
 COPY package*.json ./
 COPY backend/package.json ./backend/
-# Backend depends on common
+# Backend depends on common and docs
 COPY common/package.json ./common/
+COPY docs/package.json ./docs/
 
 RUN npm install --silent
 
@@ -34,6 +35,7 @@ COPY ./backend/i18n ./i18n
 
 COPY --from=build-stage /app/dwengo/common/dist ./common/dist
 COPY --from=build-stage /app/dwengo/backend/dist ./backend/dist
+COPY --from=build-stage /app/dwengo/docs/api/swagger.json ./docs/api/swagger.json
 
 COPY package*.json ./
 COPY backend/package.json ./backend/
@@ -42,7 +44,6 @@ COPY common/package.json ./common/
 
 RUN npm install --silent --only=production
 
-COPY ./docs ./docs
 COPY ./backend/i18n ./backend/i18n
 
 EXPOSE 3000

backend/package.json

@@ -7,12 +7,12 @@
     "main": "dist/app.js",
     "scripts": {
         "build": "cross-env NODE_ENV=production tsc --build",
-        "dev": "cross-env NODE_ENV=development tsx watch --env-file=.env.development.local src/app.ts",
+        "dev": "cross-env NODE_ENV=development tsx tool/seed.ts; tsx watch --env-file=.env.development.local src/app.ts",
         "start": "cross-env NODE_ENV=production node --env-file=.env dist/app.js",
         "format": "prettier --write src/",
         "format-check": "prettier --check src/",
         "lint": "eslint . --fix",
-        "pretest:unit": "npm run build",
+        "pretest:unit": "tsx ../docs/api/generate.ts && npm run build",
         "test:unit": "vitest --run"
     },
     "dependencies": {

backend/src/config.ts

@@ -5,3 +5,4 @@ export const DWENGO_API_BASE = getEnvVar(envVars.LearningContentRepoApiBaseUrl);
 export const FALLBACK_LANG = getEnvVar(envVars.FallbackLanguage);
 
 export const FALLBACK_SEQ_NUM = 1;
+export const FALLBACK_VERSION_NUM = 1;

backend/src/controllers/answers.ts

@@ -0,0 +1,99 @@
+import { Request, Response } from 'express';
+import { requireFields } from './error-helper.js';
+import { getLearningObjectId, getQuestionId } from './questions.js';
+import { createAnswer, deleteAnswer, getAnswer, getAnswersByQuestion, updateAnswer } from '../services/answers.js';
+import { FALLBACK_SEQ_NUM } from '../config.js';
+import { AnswerData } from '@dwengo-1/common/interfaces/answer';
+
+export async function getAllAnswersHandler(req: Request, res: Response): Promise<void> {
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    const seq = req.params.seq;
+    const full = req.query.full === 'true';
+    requireFields({ hruid });
+
+    const learningObjectId = getLearningObjectId(hruid, version, language);
+    const questionId = getQuestionId(learningObjectId, seq);
+
+    const answers = await getAnswersByQuestion(questionId, full);
+
+    res.json({ answers });
+}
+
+export async function getAnswerHandler(req: Request, res: Response): Promise<void> {
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    const seq = req.params.seq;
+    const seqAnswer = req.params.seqAnswer;
+    requireFields({ hruid });
+
+    const learningObjectId = getLearningObjectId(hruid, version, language);
+    const questionId = getQuestionId(learningObjectId, seq);
+
+    const sequenceNumber = Number(seqAnswer) || FALLBACK_SEQ_NUM;
+    const answer = await getAnswer(questionId, sequenceNumber);
+
+    res.json({ answer });
+}
+
+export async function createAnswerHandler(req: Request, res: Response): Promise<void> {
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    const seq = req.params.seq;
+    requireFields({ hruid });
+
+    const learningObjectId = getLearningObjectId(hruid, version, language);
+    const questionId = getQuestionId(learningObjectId, seq);
+
+    const author = req.body.author as string;
+    const content = req.body.content as string;
+    requireFields({ author, content });
+
+    const answerData = req.body as AnswerData;
+
+    const answer = await createAnswer(questionId, answerData);
+
+    res.json({ answer });
+}
+
+export async function deleteAnswerHandler(req: Request, res: Response): Promise<void> {
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    const seq = req.params.seq;
+    const seqAnswer = req.params.seqAnswer;
+    requireFields({ hruid });
+
+    const learningObjectId = getLearningObjectId(hruid, version, language);
+    const questionId = getQuestionId(learningObjectId, seq);
+
+    const sequenceNumber = Number(seqAnswer) || FALLBACK_SEQ_NUM;
+    const answer = await deleteAnswer(questionId, sequenceNumber);
+
+    res.json({ answer });
+}
+
+export async function updateAnswerHandler(req: Request, res: Response): Promise<void> {
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    const seq = req.params.seq;
+    const seqAnswer = req.params.seqAnswer;
+    requireFields({ hruid });
+
+    const learningObjectId = getLearningObjectId(hruid, version, language);
+    const questionId = getQuestionId(learningObjectId, seq);
+
+    const content = req.body.content as string;
+    requireFields({ content });
+
+    const answerData = req.body as AnswerData;
+
+    const sequenceNumber = Number(seqAnswer) || FALLBACK_SEQ_NUM;
+    const answer = await updateAnswer(questionId, sequenceNumber, answerData);
+
+    res.json({ answer });
+}

backend/src/controllers/assignments.ts

@@ -1,77 +1,94 @@
 import { Request, Response } from 'express';
-import { createAssignment, getAllAssignments, getAssignment, getAssignmentsSubmissions } from '../services/assignments.js';
+import {
+    createAssignment,
+    deleteAssignment,
+    getAllAssignments,
+    getAssignment,
+    getAssignmentsSubmissions,
+    putAssignment,
+} from '../services/assignments.js';
 import { AssignmentDTO } from '@dwengo-1/common/interfaces/assignment';
+import { requireFields } from './error-helper.js';
+import { BadRequestException } from '../exceptions/bad-request-exception.js';
+import { Assignment } from '../entities/assignments/assignment.entity.js';
+import { EntityDTO } from '@mikro-orm/core';
 
-// Typescript is annoying with parameter forwarding from class.ts
-interface AssignmentParams {
-    classid: string;
-    id: string;
-}
-
-export async function getAllAssignmentsHandler(req: Request<AssignmentParams>, res: Response): Promise<void> {
-    const classid = req.params.classid;
+export async function getAllAssignmentsHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.classid;
     const full = req.query.full === 'true';
 
-    const assignments = await getAllAssignments(classid, full);
+    const assignments = await getAllAssignments(classId, full);
 
-    res.json({
-        assignments: assignments,
-    });
+    res.json({ assignments });
 }
 
-export async function createAssignmentHandler(req: Request<AssignmentParams>, res: Response): Promise<void> {
+export async function createAssignmentHandler(req: Request, res: Response): Promise<void> {
     const classid = req.params.classid;
+    const description = req.body.description;
+    const language = req.body.language;
+    const learningPath = req.body.learningPath;
+    const title = req.body.title;
+
+    requireFields({ description, language, learningPath, title });
+
     const assignmentData = req.body as AssignmentDTO;
-
-    if (!assignmentData.description || !assignmentData.language || !assignmentData.learningPath || !assignmentData.title) {
-        res.status(400).json({
-            error: 'Missing one or more required fields: title, description, learningPath, language',
-        });
-        return;
-    }
-
     const assignment = await createAssignment(classid, assignmentData);
 
-    if (!assignment) {
-        res.status(500).json({ error: 'Could not create assignment ' });
-        return;
-    }
-
-    res.status(201).json(assignment);
+    res.json({ assignment });
 }
 
-export async function getAssignmentHandler(req: Request<AssignmentParams>, res: Response): Promise<void> {
+export async function getAssignmentHandler(req: Request, res: Response): Promise<void> {
     const id = Number(req.params.id);
     const classid = req.params.classid;
+    requireFields({ id, classid });
 
     if (isNaN(id)) {
-        res.status(400).json({ error: 'Assignment id must be a number' });
-        return;
+        throw new BadRequestException('Assignment id should be a number');
     }
 
     const assignment = await getAssignment(classid, id);
 
-    if (!assignment) {
-        res.status(404).json({ error: 'Assignment not found' });
-        return;
-    }
-
-    res.json(assignment);
+    res.json({ assignment });
 }
 
-export async function getAssignmentsSubmissionsHandler(req: Request<AssignmentParams>, res: Response): Promise<void> {
+export async function putAssignmentHandler(req: Request, res: Response): Promise<void> {
+    const id = Number(req.params.id);
+    const classid = req.params.classid;
+    requireFields({ id, classid });
+
+    if (isNaN(id)) {
+        throw new BadRequestException('Assignment id should be a number');
+    }
+
+    const assignmentData = req.body as Partial<EntityDTO<Assignment>>;
+    const assignment = await putAssignment(classid, id, assignmentData);
+
+    res.json({ assignment });
+}
+
+export async function deleteAssignmentHandler(req: Request, _res: Response): Promise<void> {
+    const id = Number(req.params.id);
+    const classid = req.params.classid;
+    requireFields({ id, classid });
+
+    if (isNaN(id)) {
+        throw new BadRequestException('Assignment id should be a number');
+    }
+
+    await deleteAssignment(classid, id);
+}
+
+export async function getAssignmentsSubmissionsHandler(req: Request, res: Response): Promise<void> {
     const classid = req.params.classid;
     const assignmentNumber = Number(req.params.id);
     const full = req.query.full === 'true';
+    requireFields({ assignmentNumber, classid });
 
     if (isNaN(assignmentNumber)) {
-        res.status(400).json({ error: 'Assignment id must be a number' });
-        return;
+        throw new BadRequestException('Assignment id should be a number');
     }
 
     const submissions = await getAssignmentsSubmissions(classid, assignmentNumber, full);
 
-    res.json({
-        submissions: submissions,
-    });
+    res.json({ submissions });
 }

backend/src/controllers/classes.ts

@@ -1,66 +1,132 @@
 import { Request, Response } from 'express';
-import { createClass, getAllClasses, getClass, getClassStudents, getClassStudentsIds, getClassTeacherInvitations } from '../services/classes.js';
+import {
+    addClassStudent,
+    addClassTeacher,
+    createClass,
+    deleteClass,
+    deleteClassStudent,
+    deleteClassTeacher,
+    getAllClasses,
+    getClass,
+    getClassStudents,
+    getClassTeacherInvitations,
+    getClassTeachers,
+    putClass,
+} from '../services/classes.js';
 import { ClassDTO } from '@dwengo-1/common/interfaces/class';
+import { requireFields } from './error-helper.js';
+import { EntityDTO } from '@mikro-orm/core';
+import { Class } from '../entities/classes/class.entity.js';
 
 export async function getAllClassesHandler(req: Request, res: Response): Promise<void> {
     const full = req.query.full === 'true';
     const classes = await getAllClasses(full);
 
-    res.json({
-        classes: classes,
-    });
+    res.json({ classes });
 }
 
 export async function createClassHandler(req: Request, res: Response): Promise<void> {
+    const displayName = req.body.displayName;
+    requireFields({ displayName });
+
     const classData = req.body as ClassDTO;
-
-    if (!classData.displayName) {
-        res.status(400).json({
-            error: 'Missing one or more required fields: displayName',
-        });
-        return;
-    }
-
     const cls = await createClass(classData);
 
-    if (!cls) {
-        res.status(500).json({ error: 'Something went wrong while creating class' });
-        return;
-    }
-
-    res.status(201).json(cls);
+    res.json({ class: cls });
 }
 
 export async function getClassHandler(req: Request, res: Response): Promise<void> {
     const classId = req.params.id;
+    requireFields({ classId });
+
     const cls = await getClass(classId);
 
-    if (!cls) {
-        res.status(404).json({ error: 'Class not found' });
-        return;
-    }
+    res.json({ class: cls });
+}
 
-    res.json(cls);
+export async function putClassHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.id;
+    requireFields({ classId });
+
+    const newData = req.body as Partial<EntityDTO<Class>>;
+    const cls = await putClass(classId, newData);
+
+    res.json({ class: cls });
+}
+
+export async function deleteClassHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.id;
+    const cls = await deleteClass(classId);
+
+    res.json({ class: cls });
 }
 
 export async function getClassStudentsHandler(req: Request, res: Response): Promise<void> {
     const classId = req.params.id;
     const full = req.query.full === 'true';
+    requireFields({ classId });
 
-    const students = full ? await getClassStudents(classId) : await getClassStudentsIds(classId);
+    const students = await getClassStudents(classId, full);
 
-    res.json({
-        students: students,
-    });
+    res.json({ students });
+}
+
+export async function getClassTeachersHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.id;
+    const full = req.query.full === 'true';
+    requireFields({ classId });
+
+    const teachers = await getClassTeachers(classId, full);
+
+    res.json({ teachers });
 }
 
 export async function getTeacherInvitationsHandler(req: Request, res: Response): Promise<void> {
     const classId = req.params.id;
     const full = req.query.full === 'true';
+    requireFields({ classId });
 
     const invitations = await getClassTeacherInvitations(classId, full);
 
-    res.json({
-        invitations: invitations,
-    });
+    res.json({ invitations });
+}
+
+export async function deleteClassStudentHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.id;
+    const username = req.params.username;
+    requireFields({ classId, username });
+
+    const cls = await deleteClassStudent(classId, username);
+
+    res.json({ class: cls });
+}
+
+export async function deleteClassTeacherHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.id;
+    const username = req.params.username;
+    requireFields({ classId, username });
+
+    const cls = await deleteClassTeacher(classId, username);
+
+    res.json({ class: cls });
+}
+
+export async function addClassStudentHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.id;
+    const username = req.body.username;
+    requireFields({ classId, username });
+
+    const cls = await addClassStudent(classId, username);
+
+    res.json({ class: cls });
+}
+
+export async function addClassTeacherHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.id;
+    const username = req.body.username;
+    requireFields({ classId, username });
+
+    const cls = await addClassTeacher(classId, username);
+
+    res.json({ class: cls });
 }

backend/src/controllers/groups.ts

@@ -1,100 +1,104 @@
 import { Request, Response } from 'express';
-import { createGroup, getAllGroups, getGroup, getGroupSubmissions } from '../services/groups.js';
+import { createGroup, deleteGroup, getAllGroups, getGroup, getGroupSubmissions, putGroup } from '../services/groups.js';
 import { GroupDTO } from '@dwengo-1/common/interfaces/group';
+import { requireFields } from './error-helper.js';
+import { BadRequestException } from '../exceptions/bad-request-exception.js';
+import { EntityDTO } from '@mikro-orm/core';
+import { Group } from '../entities/assignments/group.entity.js';
 
-// Typescript is annoywith with parameter forwarding from class.ts
-interface GroupParams {
-    classid: string;
-    assignmentid: string;
-    groupid?: string;
-}
-
-export async function getGroupHandler(req: Request<GroupParams>, res: Response): Promise<void> {
-    const classId = req.params.classid;
-    const full = req.query.full === 'true';
-    const assignmentId = Number(req.params.assignmentid);
+function checkGroupFields(classId: string, assignmentId: number, groupId: number): void {
+    requireFields({ classId, assignmentId, groupId });
 
     if (isNaN(assignmentId)) {
-        res.status(400).json({ error: 'Assignment id must be a number' });
-        return;
+        throw new BadRequestException('Assignment id must be a number');
     }
 
-    const groupId = Number(req.params.groupid!); // Can't be undefined
-
     if (isNaN(groupId)) {
-        res.status(400).json({ error: 'Group id must be a number' });
-        return;
+        throw new BadRequestException('Group id must be a number');
     }
+}
 
-    const group = await getGroup(classId, assignmentId, groupId, full);
+export async function getGroupHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.classid;
+    const assignmentId = parseInt(req.params.assignmentid);
+    const groupId = parseInt(req.params.groupid);
+    checkGroupFields(classId, assignmentId, groupId);
 
-    if (!group) {
-        res.status(404).json({ error: 'Group not found' });
-        return;
-    }
+    const group = await getGroup(classId, assignmentId, groupId);
 
-    res.json(group);
+    res.json({ group });
+}
+
+export async function putGroupHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.classid;
+    const assignmentId = parseInt(req.params.assignmentid);
+    const groupId = parseInt(req.params.groupid);
+    checkGroupFields(classId, assignmentId, groupId);
+
+    const group = await putGroup(classId, assignmentId, groupId, req.body as Partial<EntityDTO<Group>>);
+
+    res.json({ group });
+}
+
+export async function deleteGroupHandler(req: Request, res: Response): Promise<void> {
+    const classId = req.params.classid;
+    const assignmentId = parseInt(req.params.assignmentid);
+    const groupId = parseInt(req.params.groupid);
+    checkGroupFields(classId, assignmentId, groupId);
+
+    const group = await deleteGroup(classId, assignmentId, groupId);
+
+    res.json({ group });
 }
 
 export async function getAllGroupsHandler(req: Request, res: Response): Promise<void> {
     const classId = req.params.classid;
-    const full = req.query.full === 'true';
-
     const assignmentId = Number(req.params.assignmentid);
+    const full = req.query.full === 'true';
+    requireFields({ classId, assignmentId });
 
     if (isNaN(assignmentId)) {
-        res.status(400).json({ error: 'Assignment id must be a number' });
-        return;
+        throw new BadRequestException('Assignment id must be a number');
     }
 
     const groups = await getAllGroups(classId, assignmentId, full);
 
-    res.json({
-        groups: groups,
-    });
+    res.json({ groups });
 }
 
 export async function createGroupHandler(req: Request, res: Response): Promise<void> {
     const classid = req.params.classid;
     const assignmentId = Number(req.params.assignmentid);
 
+    requireFields({ classid, assignmentId });
+
     if (isNaN(assignmentId)) {
-        res.status(400).json({ error: 'Assignment id must be a number' });
-        return;
+        throw new BadRequestException('Assignment id must be a number');
     }
 
     const groupData = req.body as GroupDTO;
     const group = await createGroup(groupData, classid, assignmentId);
 
-    if (!group) {
-        res.status(500).json({ error: 'Something went wrong while creating group' });
-        return;
-    }
-
-    res.status(201).json(group);
+    res.status(201).json({ group });
 }
 
 export async function getGroupSubmissionsHandler(req: Request, res: Response): Promise<void> {
     const classId = req.params.classid;
+    const assignmentId = Number(req.params.assignmentid);
+    const groupId = Number(req.params.groupid);
     const full = req.query.full === 'true';
 
-    const assignmentId = Number(req.params.assignmentid);
+    requireFields({ classId, assignmentId, groupId });
 
     if (isNaN(assignmentId)) {
-        res.status(400).json({ error: 'Assignment id must be a number' });
-        return;
+        throw new BadRequestException('Assignment id must be a number');
     }
 
-    const groupId = Number(req.params.groupid); // Can't be undefined
-
     if (isNaN(groupId)) {
-        res.status(400).json({ error: 'Group id must be a number' });
-        return;
+        throw new BadRequestException('Group id must be a number');
     }
 
     const submissions = await getGroupSubmissions(classId, assignmentId, groupId, full);
 
-    res.json({
-        submissions: submissions,
-    });
+    res.json({ submissions });
 }

backend/src/controllers/learning-objects.ts

@@ -6,9 +6,9 @@ import attachmentService from '../services/learning-objects/attachment-service.j
 import { BadRequestException } from '../exceptions/bad-request-exception.js';
 import { NotFoundException } from '../exceptions/not-found-exception.js';
 import { envVars, getEnvVar } from '../util/envVars.js';
-import { FilteredLearningObject, LearningObjectIdentifier, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { FilteredLearningObject, LearningObjectIdentifierDTO, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
 
-function getLearningObjectIdentifierFromRequest(req: Request): LearningObjectIdentifier {
+function getLearningObjectIdentifierFromRequest(req: Request): LearningObjectIdentifierDTO {
     if (!req.params.hruid) {
         throw new BadRequestException('HRUID is required.');
     }

backend/src/controllers/questions.ts

@@ -1,34 +1,27 @@
 import { Request, Response } from 'express';
-import { createQuestion, deleteQuestion, getAllQuestions, getAnswersByQuestion, getQuestion } from '../services/questions.js';
-import { FALLBACK_LANG, FALLBACK_SEQ_NUM } from '../config.js';
+import {
+    createQuestion,
+    deleteQuestion,
+    getAllQuestions,
+    getQuestion,
+    getQuestionsAboutLearningObjectInAssignment,
+    updateQuestion,
+} from '../services/questions.js';
+import { FALLBACK_LANG, FALLBACK_SEQ_NUM, FALLBACK_VERSION_NUM } from '../config.js';
 import { LearningObjectIdentifier } from '../entities/content/learning-object-identifier.js';
-import { QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
+import { QuestionData, QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
 import { Language } from '@dwengo-1/common/util/language';
+import { requireFields } from './error-helper.js';
 
-function getObjectId(req: Request, res: Response): LearningObjectIdentifier | null {
-    const { hruid, version } = req.params;
-    const lang = req.query.lang;
-
-    if (!hruid || !version) {
-        res.status(400).json({ error: 'Missing required parameters.' });
-        return null;
-    }
-
+export function getLearningObjectId(hruid: string, version: string, lang: string): LearningObjectIdentifier {
     return {
         hruid,
-        language: (lang as Language) || FALLBACK_LANG,
-        version: Number(version),
+        language: (lang || FALLBACK_LANG) as Language,
+        version: Number(version) || FALLBACK_VERSION_NUM,
     };
 }
 
-function getQuestionId(req: Request, res: Response): QuestionId | null {
-    const seq = req.params.seq;
-    const learningObjectIdentifier = getObjectId(req, res);
-
-    if (!learningObjectIdentifier) {
-        return null;
-    }
-
+export function getQuestionId(learningObjectIdentifier: LearningObjectIdentifier, seq: string): QuestionId {
     return {
         learningObjectIdentifier,
         sequenceNumber: seq ? Number(seq) : FALLBACK_SEQ_NUM,
@@ -36,84 +29,96 @@ function getQuestionId(req: Request, res: Response): QuestionId | null {
 }
 
 export async function getAllQuestionsHandler(req: Request, res: Response): Promise<void> {
-    const objectId = getObjectId(req, res);
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
     const full = req.query.full === 'true';
+    requireFields({ hruid });
 
-    if (!objectId) {
-        return;
-    }
+    const learningObjectId = getLearningObjectId(hruid, version, language);
 
-    const questions = await getAllQuestions(objectId, full);
-
-    if (!questions) {
-        res.status(404).json({ error: `Questions not found.` });
+    let questions: QuestionDTO[] | QuestionId[];
+    if (req.query.classId && req.query.assignmentId) {
+        questions = await getQuestionsAboutLearningObjectInAssignment(
+            learningObjectId,
+            req.query.classId as string,
+            parseInt(req.query.assignmentId as string),
+            full ?? false,
+            req.query.forStudent as string | undefined
+        );
     } else {
-        res.json({ questions: questions });
+        questions = await getAllQuestions(learningObjectId, full ?? false);
     }
+
+    res.json({ questions });
 }
 
 export async function getQuestionHandler(req: Request, res: Response): Promise<void> {
-    const questionId = getQuestionId(req, res);
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    const seq = req.params.seq;
+    requireFields({ hruid });
 
-    if (!questionId) {
-        return;
-    }
+    const learningObjectId = getLearningObjectId(hruid, version, language);
+    const questionId = getQuestionId(learningObjectId, seq);
 
     const question = await getQuestion(questionId);
 
-    if (!question) {
-        res.status(404).json({ error: `Question not found.` });
-    } else {
-        res.json(question);
-    }
-}
-
-export async function getQuestionAnswersHandler(req: Request, res: Response): Promise<void> {
-    const questionId = getQuestionId(req, res);
-    const full = req.query.full === 'true';
-
-    if (!questionId) {
-        return;
-    }
-
-    const answers = await getAnswersByQuestion(questionId, full);
-
-    if (!answers) {
-        res.status(404).json({ error: `Questions not found` });
-    } else {
-        res.json({ answers: answers });
-    }
+    res.json({ question });
 }
 
 export async function createQuestionHandler(req: Request, res: Response): Promise<void> {
-    const questionDTO = req.body as QuestionDTO;
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    requireFields({ hruid });
 
-    if (!questionDTO.learningObjectIdentifier || !questionDTO.author || !questionDTO.content) {
-        res.status(400).json({ error: 'Missing required fields: identifier and content' });
-        return;
-    }
+    const loId = getLearningObjectId(hruid, version, language);
 
-    const question = await createQuestion(questionDTO);
+    const author = req.body.author as string;
+    const content = req.body.content as string;
+    const inGroup = req.body.inGroup;
+    requireFields({ author, content, inGroup });
 
-    if (!question) {
-        res.status(400).json({ error: 'Could not create question' });
-    } else {
-        res.json(question);
-    }
+    const questionData = req.body as QuestionData;
+
+    const question = await createQuestion(loId, questionData);
+
+    res.json({ question });
 }
 
 export async function deleteQuestionHandler(req: Request, res: Response): Promise<void> {
-    const questionId = getQuestionId(req, res);
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    const seq = req.params.seq;
+    requireFields({ hruid });
 
-    if (!questionId) {
-        return;
-    }
+    const learningObjectId = getLearningObjectId(hruid, version, language);
+    const questionId = getQuestionId(learningObjectId, seq);
 
     const question = await deleteQuestion(questionId);
 
-    if (!question) {
-        res.status(400).json({ error: 'Could not find nor delete question' });
-    } else {
-        res.json(question);
-    }
+    res.json({ question });
+}
+
+export async function updateQuestionHandler(req: Request, res: Response): Promise<void> {
+    const hruid = req.params.hruid;
+    const version = req.params.version;
+    const language = req.query.lang as string;
+    const seq = req.params.seq;
+    requireFields({ hruid });
+
+    const learningObjectId = getLearningObjectId(hruid, version, language);
+    const questionId = getQuestionId(learningObjectId, seq);
+
+    const content = req.body.content as string;
+    requireFields({ content });
+
+    const questionData = req.body as QuestionData;
+
+    const question = await updateQuestion(questionId, questionData);
+
+    res.json({ question });
 }

backend/src/controllers/submissions.ts

@@ -1,61 +1,83 @@
 import { Request, Response } from 'express';
-import { createSubmission, deleteSubmission, getSubmission } from '../services/submissions.js';
+import {
+    createSubmission,
+    deleteSubmission,
+    getAllSubmissions,
+    getSubmission,
+    getSubmissionsForLearningObjectAndAssignment,
+} from '../services/submissions.js';
 import { SubmissionDTO } from '@dwengo-1/common/interfaces/submission';
 import { Language, languageMap } from '@dwengo-1/common/util/language';
+import { BadRequestException } from '../exceptions/bad-request-exception.js';
+import { requireFields } from './error-helper.js';
+import { LearningObjectIdentifier } from '../entities/content/learning-object-identifier.js';
 
-interface SubmissionParams {
-    hruid: string;
-    id: number;
+export async function getSubmissionsHandler(req: Request, res: Response): Promise<void> {
+    const loHruid = req.params.hruid;
+    const lang = languageMap[req.query.language as string] || Language.Dutch;
+    const version = parseInt(req.query.version as string) ?? 1;
+
+    const submissions = await getSubmissionsForLearningObjectAndAssignment(
+        loHruid,
+        lang,
+        version,
+        req.query.classId as string,
+        parseInt(req.query.assignmentId as string)
+    );
+
+    res.json(submissions);
 }
 
-export async function getSubmissionHandler(req: Request<SubmissionParams>, res: Response): Promise<void> {
+export async function getSubmissionHandler(req: Request, res: Response): Promise<void> {
     const lohruid = req.params.hruid;
-    const submissionNumber = Number(req.params.id);
-
-    if (isNaN(submissionNumber)) {
-        res.status(400).json({ error: 'Submission number is not a number' });
-        return;
-    }
-
     const lang = languageMap[req.query.language as string] || Language.Dutch;
     const version = (req.query.version || 1) as number;
+    const submissionNumber = Number(req.params.id);
+    requireFields({ lohruid, submissionNumber });
 
-    const submission = await getSubmission(lohruid, lang, version, submissionNumber);
-
-    if (!submission) {
-        res.status(404).json({ error: 'Submission not found' });
-        return;
+    if (isNaN(submissionNumber)) {
+        throw new BadRequestException('Submission number must be a number');
     }
 
-    res.json(submission);
+    const loId = new LearningObjectIdentifier(lohruid, lang, version);
+    const submission = await getSubmission(loId, submissionNumber);
+
+    res.json({ submission });
 }
 
+export async function getAllSubmissionsHandler(req: Request, res: Response): Promise<void> {
+    const lohruid = req.params.hruid;
+    const lang = languageMap[req.query.language as string] || Language.Dutch;
+    const version = (req.query.version || 1) as number;
+    requireFields({ lohruid });
+
+    const loId = new LearningObjectIdentifier(lohruid, lang, version);
+    const submissions = await getAllSubmissions(loId);
+
+    res.json({ submissions });
+}
+
+// TODO: gerald moet nog dingen toevoegen aan de databank voor dat dit gefinaliseerd kan worden
 export async function createSubmissionHandler(req: Request, res: Response): Promise<void> {
     const submissionDTO = req.body as SubmissionDTO;
-
     const submission = await createSubmission(submissionDTO);
 
-    if (!submission) {
-        res.status(400).json({ error: 'Failed to create submission' });
-        return;
-    }
-
-    res.json(submission);
+    res.json({ submission });
 }
 
 export async function deleteSubmissionHandler(req: Request, res: Response): Promise<void> {
     const hruid = req.params.hruid;
-    const submissionNumber = Number(req.params.id);
-
     const lang = languageMap[req.query.language as string] || Language.Dutch;
     const version = (req.query.version || 1) as number;
+    const submissionNumber = Number(req.params.id);
+    requireFields({ hruid, submissionNumber });
 
-    const submission = await deleteSubmission(hruid, lang, version, submissionNumber);
-
-    if (!submission) {
-        res.status(404).json({ error: 'Submission not found' });
-        return;
+    if (isNaN(submissionNumber)) {
+        throw new BadRequestException('Submission number must be a number');
     }
 
-    res.json(submission);
+    const loId = new LearningObjectIdentifier(hruid, lang, version);
+    const submission = await deleteSubmission(loId, submissionNumber);
+
+    res.json({ submission });
 }

backend/src/controllers/teacher-invitations.ts

@@ -0,0 +1,66 @@
+import { Request, Response } from 'express';
+import { requireFields } from './error-helper.js';
+import { createInvitation, deleteInvitation, getAllInvitations, getInvitation, updateInvitation } from '../services/teacher-invitations.js';
+import { TeacherInvitationData } from '@dwengo-1/common/interfaces/teacher-invitation';
+
+export async function getAllInvitationsHandler(req: Request, res: Response): Promise<void> {
+    const username = req.params.username;
+    const by = req.query.sent === 'true';
+    requireFields({ username });
+
+    const invitations = await getAllInvitations(username, by);
+
+    res.json({ invitations });
+}
+
+export async function getInvitationHandler(req: Request, res: Response): Promise<void> {
+    const sender = req.params.sender;
+    const receiver = req.params.receiver;
+    const classId = req.params.classId;
+    requireFields({ sender, receiver, classId });
+
+    const invitation = await getInvitation(sender, receiver, classId);
+
+    res.json({ invitation });
+}
+
+export async function createInvitationHandler(req: Request, res: Response): Promise<void> {
+    const sender = req.body.sender;
+    const receiver = req.body.receiver;
+    const classId = req.body.class;
+    requireFields({ sender, receiver, classId });
+
+    const data = req.body as TeacherInvitationData;
+    const invitation = await createInvitation(data);
+
+    res.json({ invitation });
+}
+
+export async function updateInvitationHandler(req: Request, res: Response): Promise<void> {
+    const sender = req.body.sender;
+    const receiver = req.body.receiver;
+    const classId = req.body.class;
+    req.body.accepted = req.body.accepted !== 'false';
+    requireFields({ sender, receiver, classId });
+
+    const data = req.body as TeacherInvitationData;
+    const invitation = await updateInvitation(data);
+
+    res.json({ invitation });
+}
+
+export async function deleteInvitationHandler(req: Request, res: Response): Promise<void> {
+    const sender = req.params.sender;
+    const receiver = req.params.receiver;
+    const classId = req.params.classId;
+    requireFields({ sender, receiver, classId });
+
+    const data: TeacherInvitationData = {
+        sender,
+        receiver,
+        class: classId,
+    };
+    const invitation = await deleteInvitation(data);
+
+    res.json({ invitation });
+}

backend/src/controllers/teachers.ts

@@ -81,16 +81,15 @@ export async function getTeacherQuestionHandler(req: Request, res: Response): Pr
 }
 
 export async function getStudentJoinRequestHandler(req: Request, res: Response): Promise<void> {
-    const username = req.query.username as string;
     const classId = req.params.classId;
-    requireFields({ username, classId });
+    requireFields({ classId });
 
     const joinRequests = await getJoinRequestsByClass(classId);
     res.json({ joinRequests });
 }
 
 export async function updateStudentJoinRequestHandler(req: Request, res: Response): Promise<void> {
-    const studentUsername = req.query.studentUsername as string;
+    const studentUsername = req.params.studentUsername;
     const classId = req.params.classId;
     const accepted = req.body.accepted !== 'false'; // Default = true
     requireFields({ studentUsername, classId });

backend/src/data/assignments/assignment-repository.ts

@@ -6,6 +6,22 @@ export class AssignmentRepository extends DwengoEntityRepository<Assignment> {
     public async findByClassAndId(within: Class, id: number): Promise<Assignment | null> {
         return this.findOne({ within: within, id: id });
     }
+    public async findByClassIdAndAssignmentId(withinClass: string, id: number): Promise<Assignment | null> {
+        return this.findOne({ within: { classId: withinClass }, id: id });
+    }
+    public async findAllByResponsibleTeacher(teacherUsername: string): Promise<Assignment[]> {
+        return this.findAll({
+            where: {
+                within: {
+                    teachers: {
+                        $some: {
+                            username: teacherUsername,
+                        },
+                    },
+                },
+            },
+        });
+    }
     public async findAllAssignmentsInClass(within: Class): Promise<Assignment[]> {
         return this.findAll({ where: { within: within } });
     }

backend/src/data/assignments/submission-repository.ts

@@ -3,6 +3,7 @@ import { Group } from '../../entities/assignments/group.entity.js';
 import { Submission } from '../../entities/assignments/submission.entity.js';
 import { LearningObjectIdentifier } from '../../entities/content/learning-object-identifier.js';
 import { Student } from '../../entities/users/student.entity.js';
+import { Assignment } from '../../entities/assignments/assignment.entity';
 
 export class SubmissionRepository extends DwengoEntityRepository<Submission> {
     public async findSubmissionByLearningObjectAndSubmissionNumber(
@@ -17,6 +18,14 @@ export class SubmissionRepository extends DwengoEntityRepository<Submission> {
         });
     }
 
+    public async findByLearningObject(loId: LearningObjectIdentifier): Promise<Submission[]> {
+        return this.find({
+            learningObjectHruid: loId.hruid,
+            learningObjectLanguage: loId.language,
+            learningObjectVersion: loId.version,
+        });
+    }
+
     public async findMostRecentSubmissionForStudent(loId: LearningObjectIdentifier, submitter: Student): Promise<Submission | null> {
         return this.findOne(
             {
@@ -42,11 +51,58 @@ export class SubmissionRepository extends DwengoEntityRepository<Submission> {
     }
 
     public async findAllSubmissionsForGroup(group: Group): Promise<Submission[]> {
-        return this.find({ onBehalfOf: group });
+        return this.find(
+            { onBehalfOf: group },
+            {
+                populate: ['onBehalfOf.members'],
+            }
+        );
+    }
+
+    /**
+     * Looks up all submissions for the given learning object which were submitted as part of the given assignment.
+     * When forStudentUsername is set, only the submissions of the given user's group are shown.
+     */
+    public async findAllSubmissionsForLearningObjectAndAssignment(
+        loId: LearningObjectIdentifier,
+        assignment: Assignment,
+        forStudentUsername?: string
+    ): Promise<Submission[]> {
+        const onBehalfOf = forStudentUsername
+            ? {
+                  assignment,
+                  members: {
+                      $some: {
+                          username: forStudentUsername,
+                      },
+                  },
+              }
+            : {
+                  assignment,
+              };
+
+        return this.findAll({
+            where: {
+                learningObjectHruid: loId.hruid,
+                learningObjectLanguage: loId.language,
+                learningObjectVersion: loId.version,
+                onBehalfOf,
+            },
+        });
     }
 
     public async findAllSubmissionsForStudent(student: Student): Promise<Submission[]> {
-        return this.find({ submitter: student });
+        const result = await this.find(
+            { submitter: student },
+            {
+                populate: ['onBehalfOf.members'],
+            }
+        );
+
+        // Workaround: For some reason, without this MikroORM generates an UPDATE query with a syntax error in some tests
+        this.em.clear();
+
+        return result;
     }
 
     public async deleteSubmissionByLearningObjectAndSubmissionNumber(loId: LearningObjectIdentifier, submissionNumber: number): Promise<void> {

backend/src/data/classes/class-join-request-repository.ts

@@ -2,14 +2,14 @@ import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { Class } from '../../entities/classes/class.entity.js';
 import { ClassJoinRequest } from '../../entities/classes/class-join-request.entity.js';
 import { Student } from '../../entities/users/student.entity.js';
-import { ClassJoinRequestStatus } from '@dwengo-1/common/util/class-join-request';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export class ClassJoinRequestRepository extends DwengoEntityRepository<ClassJoinRequest> {
     public async findAllRequestsBy(requester: Student): Promise<ClassJoinRequest[]> {
         return this.findAll({ where: { requester: requester } });
     }
     public async findAllOpenRequestsTo(clazz: Class): Promise<ClassJoinRequest[]> {
-        return this.findAll({ where: { class: clazz, status: ClassJoinRequestStatus.Open } }); // TODO check if works like this
+        return this.findAll({ where: { class: clazz, status: ClassStatus.Open } }); // TODO check if works like this
     }
     public async findByStudentAndClass(requester: Student, clazz: Class): Promise<ClassJoinRequest | null> {
         return this.findOne({ requester, class: clazz });

backend/src/data/classes/teacher-invitation-repository.ts

@@ -2,6 +2,7 @@ import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { Class } from '../../entities/classes/class.entity.js';
 import { TeacherInvitation } from '../../entities/classes/teacher-invitation.entity.js';
 import { Teacher } from '../../entities/users/teacher.entity.js';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export class TeacherInvitationRepository extends DwengoEntityRepository<TeacherInvitation> {
     public async findAllInvitationsForClass(clazz: Class): Promise<TeacherInvitation[]> {
@@ -11,7 +12,7 @@ export class TeacherInvitationRepository extends DwengoEntityRepository<TeacherI
         return this.findAll({ where: { sender: sender } });
     }
     public async findAllInvitationsFor(receiver: Teacher): Promise<TeacherInvitation[]> {
-        return this.findAll({ where: { receiver: receiver } });
+        return this.findAll({ where: { receiver: receiver, status: ClassStatus.Open } });
     }
     public async deleteBy(clazz: Class, sender: Teacher, receiver: Teacher): Promise<void> {
         return this.deleteWhere({
@@ -20,4 +21,11 @@ export class TeacherInvitationRepository extends DwengoEntityRepository<TeacherI
             class: clazz,
         });
     }
+    public async findBy(clazz: Class, sender: Teacher, receiver: Teacher): Promise<TeacherInvitation | null> {
+        return this.findOne({
+            sender: sender,
+            receiver: receiver,
+            class: clazz,
+        });
+    }
 }

backend/src/data/questions/answer-repository.ts

@@ -2,6 +2,7 @@ import { DwengoEntityRepository } from '../dwengo-entity-repository.js';
 import { Answer } from '../../entities/questions/answer.entity.js';
 import { Question } from '../../entities/questions/question.entity.js';
 import { Teacher } from '../../entities/users/teacher.entity.js';
+import { Loaded } from '@mikro-orm/core';
 
 export class AnswerRepository extends DwengoEntityRepository<Answer> {
     public async createAnswer(answer: { toQuestion: Question; author: Teacher; content: string }): Promise<Answer> {
@@ -19,10 +20,21 @@ export class AnswerRepository extends DwengoEntityRepository<Answer> {
             orderBy: { sequenceNumber: 'ASC' },
         });
     }
+    public async findAnswer(question: Question, sequenceNumber: number): Promise<Loaded<Answer> | null> {
+        return this.findOne({
+            toQuestion: question,
+            sequenceNumber,
+        });
+    }
     public async removeAnswerByQuestionAndSequenceNumber(question: Question, sequenceNumber: number): Promise<void> {
         return this.deleteWhere({
             toQuestion: question,
             sequenceNumber: sequenceNumber,
         });
     }
+    public async updateContent(answer: Answer, newContent: string): Promise<Answer> {
+        answer.content = newContent;
+        await this.save(answer);
+        return answer;
+    }
 }

backend/src/data/questions/question-repository.ts

@@ -3,14 +3,18 @@ import { Question } from '../../entities/questions/question.entity.js';
 import { LearningObjectIdentifier } from '../../entities/content/learning-object-identifier.js';
 import { Student } from '../../entities/users/student.entity.js';
 import { LearningObject } from '../../entities/content/learning-object.entity.js';
+import { Assignment } from '../../entities/assignments/assignment.entity.js';
+import { Loaded } from '@mikro-orm/core';
+import { Group } from '../../entities/assignments/group.entity';
 
 export class QuestionRepository extends DwengoEntityRepository<Question> {
-    public async createQuestion(question: { loId: LearningObjectIdentifier; author: Student; content: string }): Promise<Question> {
+    public async createQuestion(question: { loId: LearningObjectIdentifier; author: Student; inGroup: Group; content: string }): Promise<Question> {
         const questionEntity = this.create({
             learningObjectHruid: question.loId.hruid,
             learningObjectLanguage: question.loId.language,
             learningObjectVersion: question.loId.version,
             author: question.author,
+            inGroup: question.inGroup,
             content: question.content,
             timestamp: new Date(),
         });
@@ -18,6 +22,7 @@ export class QuestionRepository extends DwengoEntityRepository<Question> {
         questionEntity.learningObjectLanguage = question.loId.language;
         questionEntity.learningObjectVersion = question.loId.version;
         questionEntity.author = question.author;
+        questionEntity.inGroup = question.inGroup;
         questionEntity.content = question.content;
         return this.insert(questionEntity);
     }
@@ -55,10 +60,67 @@ export class QuestionRepository extends DwengoEntityRepository<Question> {
         });
     }
 
+    public async findAllByAssignment(assignment: Assignment): Promise<Question[]> {
+        return this.find({
+            inGroup: {
+                $contained: assignment.groups,
+            },
+            learningObjectHruid: assignment.learningPathHruid,
+            learningObjectLanguage: assignment.learningPathLanguage,
+        });
+    }
+
     public async findAllByAuthor(author: Student): Promise<Question[]> {
         return this.findAll({
             where: { author },
             orderBy: { timestamp: 'DESC' }, // New to old
         });
     }
+
+    /**
+     * Looks up all questions for the given learning object which were asked as part of the given assignment.
+     * When forStudentUsername is set, only the questions within the given user's group are shown.
+     */
+    public async findAllQuestionsAboutLearningObjectInAssignment(
+        loId: LearningObjectIdentifier,
+        assignment: Assignment,
+        forStudentUsername?: string
+    ): Promise<Question[]> {
+        const inGroup = forStudentUsername
+            ? {
+                  assignment,
+                  members: {
+                      $some: {
+                          username: forStudentUsername,
+                      },
+                  },
+              }
+            : {
+                  assignment,
+              };
+
+        return this.findAll({
+            where: {
+                learningObjectHruid: loId.hruid,
+                learningObjectLanguage: loId.language,
+                learningObjectVersion: loId.version,
+                inGroup,
+            },
+        });
+    }
+
+    public async findByLearningObjectAndSequenceNumber(loId: LearningObjectIdentifier, sequenceNumber: number): Promise<Loaded<Question> | null> {
+        return this.findOne({
+            learningObjectHruid: loId.hruid,
+            learningObjectLanguage: loId.language,
+            learningObjectVersion: loId.version,
+            sequenceNumber,
+        });
+    }
+
+    public async updateContent(question: Question, newContent: string): Promise<Question> {
+        question.content = newContent;
+        await this.save(question);
+        return question;
+    }
 }

backend/src/entities/assignments/assignment.entity.ts

@@ -1,4 +1,4 @@
-import { Entity, Enum, ManyToOne, OneToMany, PrimaryKey, Property } from '@mikro-orm/core';
+import { Collection, Entity, Enum, ManyToOne, OneToMany, PrimaryKey, Property } from '@mikro-orm/core';
 import { Class } from '../classes/class.entity.js';
 import { Group } from './group.entity.js';
 import { Language } from '@dwengo-1/common/util/language';
@@ -35,5 +35,5 @@ export class Assignment {
         entity: () => Group,
         mappedBy: 'assignment',
     })
-    groups!: Group[];
+    groups!: Collection<Group>;
 }

backend/src/entities/assignments/group.entity.ts

@@ -1,4 +1,4 @@
-import { Entity, ManyToMany, ManyToOne, PrimaryKey } from '@mikro-orm/core';
+import { Collection, Entity, ManyToMany, ManyToOne, PrimaryKey } from '@mikro-orm/core';
 import { Assignment } from './assignment.entity.js';
 import { Student } from '../users/student.entity.js';
 import { GroupRepository } from '../../data/assignments/group-repository.js';
@@ -19,5 +19,5 @@ export class Group {
     @ManyToMany({
         entity: () => Student,
     })
-    members!: Student[];
+    members!: Collection<Student>;
 }

backend/src/entities/assignments/submission.entity.ts

@@ -21,6 +21,11 @@ export class Submission {
     @PrimaryKey({ type: 'integer', autoincrement: true })
     submissionNumber?: number;
 
+    @ManyToOne({
+        entity: () => Group,
+    })
+    onBehalfOf!: Group;
+
     @ManyToOne({
         entity: () => Student,
     })
@@ -29,12 +34,6 @@ export class Submission {
     @Property({ type: 'datetime' })
     submissionTime!: Date;
 
-    @ManyToOne({
-        entity: () => Group,
-        nullable: true,
-    })
-    onBehalfOf?: Group;
-
     @Property({ type: 'json' })
     content!: string;
 }

backend/src/entities/classes/class-join-request.entity.ts

@@ -2,7 +2,7 @@ import { Entity, Enum, ManyToOne } from '@mikro-orm/core';
 import { Student } from '../users/student.entity.js';
 import { Class } from './class.entity.js';
 import { ClassJoinRequestRepository } from '../../data/classes/class-join-request-repository.js';
-import { ClassJoinRequestStatus } from '@dwengo-1/common/util/class-join-request';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 @Entity({
     repository: () => ClassJoinRequestRepository,
@@ -20,6 +20,6 @@ export class ClassJoinRequest {
     })
     class!: Class;
 
-    @Enum(() => ClassJoinRequestStatus)
-    status!: ClassJoinRequestStatus;
+    @Enum(() => ClassStatus)
+    status!: ClassStatus;
 }

backend/src/entities/classes/teacher-invitation.entity.ts

@@ -1,7 +1,8 @@
-import { Entity, ManyToOne } from '@mikro-orm/core';
+import { Entity, Enum, ManyToOne } from '@mikro-orm/core';
 import { Teacher } from '../users/teacher.entity.js';
 import { Class } from './class.entity.js';
 import { TeacherInvitationRepository } from '../../data/classes/teacher-invitation-repository.js';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 /**
  * Invitation of a teacher into a class (in order to teach it).
@@ -25,4 +26,7 @@ export class TeacherInvitation {
         primary: true,
     })
     class!: Class;
+
+    @Enum(() => ClassStatus)
+    status!: ClassStatus;
 }

backend/src/entities/questions/question.entity.ts

@@ -2,6 +2,7 @@ import { Entity, Enum, ManyToOne, PrimaryKey, Property } from '@mikro-orm/core';
 import { Student } from '../users/student.entity.js';
 import { QuestionRepository } from '../../data/questions/question-repository.js';
 import { Language } from '@dwengo-1/common/util/language';
+import { Group } from '../assignments/group.entity.js';
 
 @Entity({ repository: () => QuestionRepository })
 export class Question {
@@ -20,6 +21,9 @@ export class Question {
     @PrimaryKey({ type: 'integer', autoincrement: true })
     sequenceNumber?: number;
 
+    @ManyToOne({ entity: () => Group })
+    inGroup!: Group;
+
     @ManyToOne({
         entity: () => Student,
     })

backend/src/interfaces/answer.ts

@@ -1,14 +1,14 @@
-import { mapToUserDTO } from './user.js';
 import { mapToQuestionDTO, mapToQuestionDTOId } from './question.js';
 import { Answer } from '../entities/questions/answer.entity.js';
 import { AnswerDTO, AnswerId } from '@dwengo-1/common/interfaces/answer';
+import { mapToTeacherDTO } from './teacher.js';
 
 /**
  * Convert a Question entity to a DTO format.
  */
 export function mapToAnswerDTO(answer: Answer): AnswerDTO {
     return {
-        author: mapToUserDTO(answer.author),
+        author: mapToTeacherDTO(answer.author),
         toQuestion: mapToQuestionDTO(answer.toQuestion),
         sequenceNumber: answer.sequenceNumber!,
         timestamp: answer.timestamp.toISOString(),

backend/src/interfaces/assignment.ts

@@ -8,19 +8,18 @@ import { AssignmentDTO } from '@dwengo-1/common/interfaces/assignment';
 export function mapToAssignmentDTOId(assignment: Assignment): AssignmentDTO {
     return {
         id: assignment.id!,
-        class: assignment.within.classId!,
+        within: assignment.within.classId!,
         title: assignment.title,
         description: assignment.description,
         learningPath: assignment.learningPathHruid,
         language: assignment.learningPathLanguage,
-        // Groups: assignment.groups.map(group => group.groupNumber),
     };
 }
 
 export function mapToAssignmentDTO(assignment: Assignment): AssignmentDTO {
     return {
         id: assignment.id!,
-        class: assignment.within.classId!,
+        within: assignment.within.classId!,
         title: assignment.title,
         description: assignment.description,
         learningPath: assignment.learningPathHruid,

backend/src/interfaces/class.ts

@@ -10,7 +10,6 @@ export function mapToClassDTO(cls: Class): ClassDTO {
         displayName: cls.displayName,
         teachers: cls.teachers.map((teacher) => teacher.username),
         students: cls.students.map((student) => student.username),
-        joinRequests: [], // TODO
     };
 }
 

backend/src/interfaces/group.ts

@@ -1,11 +1,29 @@
 import { Group } from '../entities/assignments/group.entity.js';
+import { mapToAssignment } from './assignment.js';
+import { mapToStudent } from './student.js';
 import { mapToAssignmentDTO } from './assignment.js';
 import { mapToStudentDTO } from './student.js';
 import { GroupDTO } from '@dwengo-1/common/interfaces/group';
+import { getGroupRepository } from '../data/repositories.js';
+import { AssignmentDTO } from '@dwengo-1/common/interfaces/assignment';
+import { Class } from '../entities/classes/class.entity.js';
+import { StudentDTO } from '@dwengo-1/common/interfaces/student';
+import { mapToClassDTO } from './class.js';
+
+export function mapToGroup(groupDto: GroupDTO, clazz: Class): Group {
+    const assignmentDto = groupDto.assignment as AssignmentDTO;
+
+    return getGroupRepository().create({
+        groupNumber: groupDto.groupNumber,
+        assignment: mapToAssignment(assignmentDto, clazz),
+        members: groupDto.members!.map((studentDto) => mapToStudent(studentDto as StudentDTO)),
+    });
+}
 
 export function mapToGroupDTO(group: Group): GroupDTO {
     return {
-        assignment: mapToAssignmentDTO(group.assignment), // ERROR: , group.assignment.within),
+        class: mapToClassDTO(group.assignment.within),
+        assignment: mapToAssignmentDTO(group.assignment),
         groupNumber: group.groupNumber!,
         members: group.members.map(mapToStudentDTO),
     };
@@ -13,6 +31,18 @@ export function mapToGroupDTO(group: Group): GroupDTO {
 
 export function mapToGroupDTOId(group: Group): GroupDTO {
     return {
+        class: group.assignment.within.classId!,
+        assignment: group.assignment.id!,
+        groupNumber: group.groupNumber!,
+    };
+}
+
+/**
+ * Map to group DTO where other objects are only referenced by their id.
+ */
+export function mapToShallowGroupDTO(group: Group): GroupDTO {
+    return {
+        class: group.assignment.within.classId!,
         assignment: group.assignment.id!,
         groupNumber: group.groupNumber!,
         members: group.members.map((member) => member.username),

backend/src/interfaces/question.ts

@@ -1,9 +1,11 @@
 import { Question } from '../entities/questions/question.entity.js';
 import { mapToStudentDTO } from './student.js';
 import { QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
-import { LearningObjectIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { LearningObjectIdentifierDTO } from '@dwengo-1/common/interfaces/learning-content';
+import { LearningObjectIdentifier } from '../entities/content/learning-object-identifier.js';
+import { mapToGroupDTOId } from './group.js';
 
-function getLearningObjectIdentifier(question: Question): LearningObjectIdentifier {
+function getLearningObjectIdentifier(question: Question): LearningObjectIdentifierDTO {
     return {
         hruid: question.learningObjectHruid,
         language: question.learningObjectLanguage,
@@ -11,6 +13,14 @@ function getLearningObjectIdentifier(question: Question): LearningObjectIdentifi
     };
 }
 
+export function mapToLearningObjectID(loID: LearningObjectIdentifierDTO): LearningObjectIdentifier {
+    return {
+        hruid: loID.hruid,
+        language: loID.language,
+        version: loID.version ?? 1,
+    };
+}
+
 /**
  * Convert a Question entity to a DTO format.
  */
@@ -21,6 +31,7 @@ export function mapToQuestionDTO(question: Question): QuestionDTO {
         learningObjectIdentifier,
         sequenceNumber: question.sequenceNumber!,
         author: mapToStudentDTO(question.author),
+        inGroup: mapToGroupDTOId(question.inGroup),
         timestamp: question.timestamp.toISOString(),
         content: question.content,
     };

backend/src/interfaces/student-request.ts

@@ -4,7 +4,7 @@ import { getClassJoinRequestRepository } from '../data/repositories.js';
 import { Student } from '../entities/users/student.entity.js';
 import { Class } from '../entities/classes/class.entity.js';
 import { ClassJoinRequestDTO } from '@dwengo-1/common/interfaces/class-join-request';
-import { ClassJoinRequestStatus } from '@dwengo-1/common/util/class-join-request';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export function mapToStudentRequestDTO(request: ClassJoinRequest): ClassJoinRequestDTO {
     return {
@@ -18,6 +18,6 @@ export function mapToStudentRequest(student: Student, cls: Class): ClassJoinRequ
     return getClassJoinRequestRepository().create({
         requester: student,
         class: cls,
-        status: ClassJoinRequestStatus.Open,
+        status: ClassStatus.Open,
     });
 }

backend/src/interfaces/submission.ts

@@ -1,7 +1,10 @@
 import { Submission } from '../entities/assignments/submission.entity.js';
 import { mapToGroupDTO } from './group.js';
-import { mapToStudent, mapToStudentDTO } from './student.js';
+import { mapToStudentDTO } from './student.js';
 import { SubmissionDTO, SubmissionDTOId } from '@dwengo-1/common/interfaces/submission';
+import { getSubmissionRepository } from '../data/repositories.js';
+import { Student } from '../entities/users/student.entity.js';
+import { Group } from '../entities/assignments/group.entity.js';
 
 export function mapToSubmissionDTO(submission: Submission): SubmissionDTO {
     return {
@@ -14,7 +17,7 @@ export function mapToSubmissionDTO(submission: Submission): SubmissionDTO {
         submissionNumber: submission.submissionNumber,
         submitter: mapToStudentDTO(submission.submitter),
         time: submission.submissionTime,
-        group: submission.onBehalfOf ? mapToGroupDTO(submission.onBehalfOf) : undefined,
+        group: mapToGroupDTO(submission.onBehalfOf),
         content: submission.content,
     };
 }
@@ -29,17 +32,14 @@ export function mapToSubmissionDTOId(submission: Submission): SubmissionDTOId {
     };
 }
 
-export function mapToSubmission(submissionDTO: SubmissionDTO): Submission {
-    const submission = new Submission();
-    submission.learningObjectHruid = submissionDTO.learningObjectIdentifier.hruid;
-    submission.learningObjectLanguage = submissionDTO.learningObjectIdentifier.language;
-    submission.learningObjectVersion = submissionDTO.learningObjectIdentifier.version!;
-    // Submission.submissionNumber = submissionDTO.submissionNumber;
-    submission.submitter = mapToStudent(submissionDTO.submitter);
-    // Submission.submissionTime = submissionDTO.time;
-    // Submission.onBehalfOf =  submissionDTO.group!;
-    // TODO fix group
-    submission.content = submissionDTO.content;
-
-    return submission;
+export function mapToSubmission(submissionDTO: SubmissionDTO, submitter: Student, onBehalfOf: Group): Submission {
+    return getSubmissionRepository().create({
+        learningObjectHruid: submissionDTO.learningObjectIdentifier.hruid,
+        learningObjectLanguage: submissionDTO.learningObjectIdentifier.language,
+        learningObjectVersion: submissionDTO.learningObjectIdentifier.version || 1,
+        submitter: submitter,
+        submissionTime: new Date(),
+        content: submissionDTO.content,
+        onBehalfOf: onBehalfOf,
+    });
 }

backend/src/interfaces/teacher-invitation.ts

@@ -1,13 +1,17 @@
 import { TeacherInvitation } from '../entities/classes/teacher-invitation.entity.js';
-import { mapToClassDTO } from './class.js';
 import { mapToUserDTO } from './user.js';
 import { TeacherInvitationDTO } from '@dwengo-1/common/interfaces/teacher-invitation';
+import { getTeacherInvitationRepository } from '../data/repositories.js';
+import { Teacher } from '../entities/users/teacher.entity.js';
+import { Class } from '../entities/classes/class.entity.js';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export function mapToTeacherInvitationDTO(invitation: TeacherInvitation): TeacherInvitationDTO {
     return {
         sender: mapToUserDTO(invitation.sender),
         receiver: mapToUserDTO(invitation.receiver),
-        class: mapToClassDTO(invitation.class),
+        classId: invitation.class.classId!,
+        status: invitation.status,
     };
 }
 
@@ -15,6 +19,16 @@ export function mapToTeacherInvitationDTOIds(invitation: TeacherInvitation): Tea
     return {
         sender: invitation.sender.username,
         receiver: invitation.receiver.username,
-        class: invitation.class.classId!,
+        classId: invitation.class.classId!,
+        status: invitation.status,
     };
 }
+
+export function mapToInvitation(sender: Teacher, receiver: Teacher, cls: Class): TeacherInvitation {
+    return getTeacherInvitationRepository().create({
+        sender,
+        receiver,
+        class: cls,
+        status: ClassStatus.Open,
+    });
+}

backend/src/orm.ts

@@ -1,10 +1,10 @@
-import { EntityManager, MikroORM } from '@mikro-orm/core';
+import { EntityManager, IDatabaseDriver, MikroORM } from '@mikro-orm/core';
 import config from './mikro-orm.config.js';
 import { envVars, getEnvVar } from './util/envVars.js';
 import { getLogger, Logger } from './logging/initalize.js';
 
 let orm: MikroORM | undefined;
-export async function initORM(testingMode = false): Promise<void> {
+export async function initORM(testingMode = false): Promise<MikroORM<IDatabaseDriver, EntityManager>> {
     const logger: Logger = getLogger();
 
     logger.info('Initializing ORM');
@@ -25,6 +25,8 @@ export async function initORM(testingMode = false): Promise<void> {
             );
         }
     }
+
+    return orm;
 }
 export function forkEntityManager(): EntityManager {
     if (!orm) {

backend/src/routes/answers.ts

@@ -0,0 +1,16 @@
+import express from 'express';
+import { createAnswerHandler, deleteAnswerHandler, getAnswerHandler, getAllAnswersHandler, updateAnswerHandler } from '../controllers/answers.js';
+
+const router = express.Router({ mergeParams: true });
+
+router.get('/', getAllAnswersHandler);
+
+router.post('/', createAnswerHandler);
+
+router.get('/:seqAnswer', getAnswerHandler);
+
+router.delete('/:seqAnswer', deleteAnswerHandler);
+
+router.put('/:seqAnswer', updateAnswerHandler);
+
+export default router;

backend/src/routes/assignments.ts

@@ -1,22 +1,26 @@
 import express from 'express';
 import {
     createAssignmentHandler,
+    deleteAssignmentHandler,
     getAllAssignmentsHandler,
     getAssignmentHandler,
     getAssignmentsSubmissionsHandler,
+    putAssignmentHandler,
 } from '../controllers/assignments.js';
 import groupRouter from './groups.js';
 
 const router = express.Router({ mergeParams: true });
 
-// Root endpoint used to search objects
 router.get('/', getAllAssignmentsHandler);
 
 router.post('/', createAssignmentHandler);
 
-// Information about an assignment with id 'id'
 router.get('/:id', getAssignmentHandler);
 
+router.put('/:id', putAssignmentHandler);
+
+router.delete('/:id', deleteAssignmentHandler);
+
 router.get('/:id/submissions', getAssignmentsSubmissionsHandler);
 
 router.get('/:id/questions', (_req, res) => {

backend/src/routes/classes.ts

@@ -1,10 +1,17 @@
 import express from 'express';
 import {
+    addClassStudentHandler,
+    addClassTeacherHandler,
     createClassHandler,
+    deleteClassHandler,
+    deleteClassStudentHandler,
+    deleteClassTeacherHandler,
     getAllClassesHandler,
     getClassHandler,
     getClassStudentsHandler,
+    getClassTeachersHandler,
     getTeacherInvitationsHandler,
+    putClassHandler,
 } from '../controllers/classes.js';
 import assignmentRouter from './assignments.js';
 
@@ -15,13 +22,26 @@ router.get('/', getAllClassesHandler);
 
 router.post('/', createClassHandler);
 
-// Information about an class with id 'id'
 router.get('/:id', getClassHandler);
 
+router.put('/:id', putClassHandler);
+
+router.delete('/:id', deleteClassHandler);
+
 router.get('/:id/teacher-invitations', getTeacherInvitationsHandler);
 
 router.get('/:id/students', getClassStudentsHandler);
 
+router.post('/:id/students', addClassStudentHandler);
+
+router.delete('/:id/students/:username', deleteClassStudentHandler);
+
+router.get('/:id/teachers', getClassTeachersHandler);
+
+router.post('/:id/teachers', addClassTeacherHandler);
+
+router.delete('/:id/teachers/:username', deleteClassTeacherHandler);
+
 router.use('/:classid/assignments', assignmentRouter);
 
 export default router;

backend/src/routes/groups.ts

@@ -1,5 +1,12 @@
 import express from 'express';
-import { createGroupHandler, getAllGroupsHandler, getGroupHandler, getGroupSubmissionsHandler } from '../controllers/groups.js';
+import {
+    createGroupHandler,
+    deleteGroupHandler,
+    getAllGroupsHandler,
+    getGroupHandler,
+    getGroupSubmissionsHandler,
+    putGroupHandler,
+} from '../controllers/groups.js';
 
 const router = express.Router({ mergeParams: true });
 
@@ -8,16 +15,12 @@ router.get('/', getAllGroupsHandler);
 
 router.post('/', createGroupHandler);
 
-// Information about a group (members, ... [TODO DOC])
 router.get('/:groupid', getGroupHandler);
 
+router.put('/:groupid', putGroupHandler);
+
+router.delete('/:groupid', deleteGroupHandler);
+
 router.get('/:groupid/submissions', getGroupSubmissionsHandler);
 
-// The list of questions a group has made
-router.get('/:id/questions', (_req, res) => {
-    res.json({
-        questions: ['0'],
-    });
-});
-
 export default router;

backend/src/routes/questions.ts

@@ -1,11 +1,7 @@
 import express from 'express';
-import {
-    createQuestionHandler,
-    deleteQuestionHandler,
-    getAllQuestionsHandler,
-    getQuestionAnswersHandler,
-    getQuestionHandler,
-} from '../controllers/questions.js';
+import { createQuestionHandler, deleteQuestionHandler, getAllQuestionsHandler, getQuestionHandler } from '../controllers/questions.js';
+import answerRoutes from './answers.js';
+
 const router = express.Router({ mergeParams: true });
 
 // Query language
@@ -20,6 +16,6 @@ router.delete('/:seq', deleteQuestionHandler);
 // Information about a question with id
 router.get('/:seq', getQuestionHandler);
 
-router.get('/answers/:seq', getQuestionAnswersHandler);
+router.use('/:seq/answers', answerRoutes);
 
 export default router;

backend/src/routes/submissions.ts

@@ -1,13 +1,9 @@
 import express from 'express';
-import { createSubmissionHandler, deleteSubmissionHandler, getSubmissionHandler } from '../controllers/submissions.js';
+import { createSubmissionHandler, deleteSubmissionHandler, getSubmissionHandler, getSubmissionsHandler } from '../controllers/submissions.js';
 const router = express.Router({ mergeParams: true });
 
 // Root endpoint used to search objects
-router.get('/', (_req, res) => {
-    res.json({
-        submissions: ['0', '1'],
-    });
-});
+router.get('/', getSubmissionsHandler);
 
 router.post('/:id', createSubmissionHandler);
 

backend/src/routes/teacher-invitations.ts

@@ -0,0 +1,22 @@
+import express from 'express';
+import {
+    createInvitationHandler,
+    deleteInvitationHandler,
+    getAllInvitationsHandler,
+    getInvitationHandler,
+    updateInvitationHandler,
+} from '../controllers/teacher-invitations.js';
+
+const router = express.Router({ mergeParams: true });
+
+router.get('/:username', getAllInvitationsHandler);
+
+router.get('/:sender/:receiver/:classId', getInvitationHandler);
+
+router.post('/', createInvitationHandler);
+
+router.put('/', updateInvitationHandler);
+
+router.delete('/:sender/:receiver/:classId', deleteInvitationHandler);
+
+export default router;

backend/src/routes/teachers.ts

@@ -10,6 +10,8 @@ import {
     getTeacherStudentHandler,
     updateStudentJoinRequestHandler,
 } from '../controllers/teachers.js';
+import invitationRouter from './teacher-invitations.js';
+
 const router = express.Router();
 
 // Root endpoint used to search objects
@@ -32,10 +34,6 @@ router.get('/:username/joinRequests/:classId', getStudentJoinRequestHandler);
 router.put('/:username/joinRequests/:classId/:studentUsername', updateStudentJoinRequestHandler);
 
 // Invitations to other classes a teacher received
-router.get('/:id/invitations', (_req, res) => {
-    res.json({
-        invitations: ['0'],
-    });
-});
+router.get('/invitations', invitationRouter);
 
 export default router;

backend/src/services/answers.ts

@@ -0,0 +1,70 @@
+import { getAnswerRepository } from '../data/repositories.js';
+import { Answer } from '../entities/questions/answer.entity.js';
+import { mapToAnswerDTO, mapToAnswerDTOId } from '../interfaces/answer.js';
+import { fetchTeacher } from './teachers.js';
+import { fetchQuestion } from './questions.js';
+import { QuestionId } from '@dwengo-1/common/interfaces/question';
+import { AnswerData, AnswerDTO, AnswerId } from '@dwengo-1/common/interfaces/answer';
+import { NotFoundException } from '../exceptions/not-found-exception.js';
+
+export async function getAnswersByQuestion(questionId: QuestionId, full: boolean): Promise<AnswerDTO[] | AnswerId[]> {
+    const answerRepository = getAnswerRepository();
+    const question = await fetchQuestion(questionId);
+
+    const answers: Answer[] = await answerRepository.findAllAnswersToQuestion(question);
+
+    if (full) {
+        return answers.map(mapToAnswerDTO);
+    }
+
+    return answers.map(mapToAnswerDTOId);
+}
+
+export async function createAnswer(questionId: QuestionId, answerData: AnswerData): Promise<AnswerDTO> {
+    const answerRepository = getAnswerRepository();
+    const toQuestion = await fetchQuestion(questionId);
+    const author = await fetchTeacher(answerData.author);
+    const content = answerData.content;
+
+    const answer = await answerRepository.createAnswer({
+        toQuestion,
+        author,
+        content,
+    });
+    return mapToAnswerDTO(answer);
+}
+
+async function fetchAnswer(questionId: QuestionId, sequenceNumber: number): Promise<Answer> {
+    const answerRepository = getAnswerRepository();
+    const question = await fetchQuestion(questionId);
+    const answer = await answerRepository.findAnswer(question, sequenceNumber);
+
+    if (!answer) {
+        throw new NotFoundException('Answer with questionID and sequence number not found');
+    }
+
+    return answer;
+}
+
+export async function getAnswer(questionId: QuestionId, sequenceNumber: number): Promise<AnswerDTO> {
+    const answer = await fetchAnswer(questionId, sequenceNumber);
+    return mapToAnswerDTO(answer);
+}
+
+export async function deleteAnswer(questionId: QuestionId, sequenceNumber: number): Promise<AnswerDTO> {
+    const answerRepository = getAnswerRepository();
+
+    const question = await fetchQuestion(questionId);
+    const answer = await fetchAnswer(questionId, sequenceNumber);
+
+    await answerRepository.removeAnswerByQuestionAndSequenceNumber(question, sequenceNumber);
+    return mapToAnswerDTO(answer);
+}
+
+export async function updateAnswer(questionId: QuestionId, sequenceNumber: number, answerData: AnswerData): Promise<AnswerDTO> {
+    const answerRepository = getAnswerRepository();
+    const answer = await fetchAnswer(questionId, sequenceNumber);
+
+    const newAnswer = await answerRepository.updateContent(answer, answerData.content);
+    return mapToAnswerDTO(newAnswer);
+}

backend/src/services/assignments.ts

@@ -1,18 +1,43 @@
-import { getAssignmentRepository, getClassRepository, getGroupRepository, getSubmissionRepository } from '../data/repositories.js';
-import { mapToAssignment, mapToAssignmentDTO, mapToAssignmentDTOId } from '../interfaces/assignment.js';
-import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
 import { AssignmentDTO } from '@dwengo-1/common/interfaces/assignment';
+import {
+    getAssignmentRepository,
+    getClassRepository,
+    getGroupRepository,
+    getQuestionRepository,
+    getSubmissionRepository,
+} from '../data/repositories.js';
+import { Assignment } from '../entities/assignments/assignment.entity.js';
+import { NotFoundException } from '../exceptions/not-found-exception.js';
+import { mapToAssignment, mapToAssignmentDTO, mapToAssignmentDTOId } from '../interfaces/assignment.js';
+import { mapToQuestionDTO } from '../interfaces/question.js';
+import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
+import { fetchClass } from './classes.js';
+import { QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
 import { SubmissionDTO, SubmissionDTOId } from '@dwengo-1/common/interfaces/submission';
-import { getLogger } from '../logging/initalize.js';
+import { EntityDTO } from '@mikro-orm/core';
+import { putObject } from './service-helper.js';
 
-export async function getAllAssignments(classid: string, full: boolean): Promise<AssignmentDTO[]> {
+export async function fetchAssignment(classid: string, assignmentNumber: number): Promise<Assignment> {
     const classRepository = getClassRepository();
     const cls = await classRepository.findById(classid);
 
     if (!cls) {
-        return [];
+        throw new NotFoundException("Could not find assignment's class");
     }
 
+    const assignmentRepository = getAssignmentRepository();
+    const assignment = await assignmentRepository.findByClassAndId(cls, assignmentNumber);
+
+    if (!assignment) {
+        throw new NotFoundException('Could not find assignment');
+    }
+
+    return assignment;
+}
+
+export async function getAllAssignments(classid: string, full: boolean): Promise<AssignmentDTO[]> {
+    const cls = await fetchClass(classid);
+
     const assignmentRepository = getAssignmentRepository();
     const assignments = await assignmentRepository.findAllAssignmentsInClass(cls);
 
@@ -23,42 +48,37 @@ export async function getAllAssignments(classid: string, full: boolean): Promise
     return assignments.map(mapToAssignmentDTOId);
 }
 
-export async function createAssignment(classid: string, assignmentData: AssignmentDTO): Promise<AssignmentDTO | null> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classid);
-
-    if (!cls) {
-        return null;
-    }
+export async function createAssignment(classid: string, assignmentData: AssignmentDTO): Promise<AssignmentDTO> {
+    const cls = await fetchClass(classid);
 
     const assignment = mapToAssignment(assignmentData, cls);
+
     const assignmentRepository = getAssignmentRepository();
+    const newAssignment = assignmentRepository.create(assignment);
+    await assignmentRepository.save(newAssignment, { preventOverwrite: true });
 
-    try {
-        const newAssignment = assignmentRepository.create(assignment);
-        await assignmentRepository.save(newAssignment);
-
-        return mapToAssignmentDTO(newAssignment);
-    } catch (e) {
-        getLogger().error(e);
-        return null;
-    }
+    return mapToAssignmentDTO(newAssignment);
 }
 
-export async function getAssignment(classid: string, id: number): Promise<AssignmentDTO | null> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classid);
+export async function getAssignment(classid: string, id: number): Promise<AssignmentDTO> {
+    const assignment = await fetchAssignment(classid, id);
+    return mapToAssignmentDTO(assignment);
+}
 
-    if (!cls) {
-        return null;
-    }
+export async function putAssignment(classid: string, id: number, assignmentData: Partial<EntityDTO<Assignment>>): Promise<AssignmentDTO> {
+    const assignment = await fetchAssignment(classid, id);
+
+    await putObject<Assignment>(assignment, assignmentData, getAssignmentRepository());
+
+    return mapToAssignmentDTO(assignment);
+}
+
+export async function deleteAssignment(classid: string, id: number): Promise<AssignmentDTO> {
+    const assignment = await fetchAssignment(classid, id);
+    const cls = await fetchClass(classid);
 
     const assignmentRepository = getAssignmentRepository();
-    const assignment = await assignmentRepository.findByClassAndId(cls, id);
-
-    if (!assignment) {
-        return null;
-    }
+    await assignmentRepository.deleteByClassAndId(cls, id);
 
     return mapToAssignmentDTO(assignment);
 }
@@ -68,19 +88,7 @@ export async function getAssignmentsSubmissions(
     assignmentNumber: number,
     full: boolean
 ): Promise<SubmissionDTO[] | SubmissionDTOId[]> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classid);
-
-    if (!cls) {
-        return [];
-    }
-
-    const assignmentRepository = getAssignmentRepository();
-    const assignment = await assignmentRepository.findByClassAndId(cls, assignmentNumber);
-
-    if (!assignment) {
-        return [];
-    }
+    const assignment = await fetchAssignment(classid, assignmentNumber);
 
     const groupRepository = getGroupRepository();
     const groups = await groupRepository.findAllGroupsForAssignment(assignment);
@@ -94,3 +102,16 @@ export async function getAssignmentsSubmissions(
 
     return submissions.map(mapToSubmissionDTOId);
 }
+
+export async function getAssignmentsQuestions(classid: string, assignmentNumber: number, full: boolean): Promise<QuestionDTO[] | QuestionId[]> {
+    const assignment = await fetchAssignment(classid, assignmentNumber);
+
+    const questionRepository = getQuestionRepository();
+    const questions = await questionRepository.findAllByAssignment(assignment);
+
+    if (full) {
+        return questions.map(mapToQuestionDTO);
+    }
+
+    return questions.map(mapToQuestionDTO);
+}

backend/src/services/classes.ts

@@ -1,22 +1,25 @@
-import { getClassRepository, getStudentRepository, getTeacherInvitationRepository, getTeacherRepository } from '../data/repositories.js';
+import { getClassRepository, getTeacherInvitationRepository } from '../data/repositories.js';
 import { mapToClassDTO } from '../interfaces/class.js';
 import { mapToStudentDTO } from '../interfaces/student.js';
 import { mapToTeacherInvitationDTO, mapToTeacherInvitationDTOIds } from '../interfaces/teacher-invitation.js';
-import { getLogger } from '../logging/initalize.js';
 import { NotFoundException } from '../exceptions/not-found-exception.js';
 import { Class } from '../entities/classes/class.entity.js';
 import { ClassDTO } from '@dwengo-1/common/interfaces/class';
 import { TeacherInvitationDTO } from '@dwengo-1/common/interfaces/teacher-invitation';
 import { StudentDTO } from '@dwengo-1/common/interfaces/student';
+import { fetchTeacher } from './teachers.js';
+import { fetchStudent } from './students.js';
+import { TeacherDTO } from '@dwengo-1/common/interfaces/teacher';
+import { mapToTeacherDTO } from '../interfaces/teacher.js';
+import { EntityDTO } from '@mikro-orm/core';
+import { putObject } from './service-helper.js';
 
-const logger = getLogger();
-
-export async function fetchClass(classId: string): Promise<Class> {
+export async function fetchClass(classid: string): Promise<Class> {
     const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classId);
+    const cls = await classRepository.findById(classid);
 
     if (!cls) {
-        throw new NotFoundException('Class with id not found');
+        throw new NotFoundException('Class not found');
     }
 
     return cls;
@@ -24,11 +27,7 @@ export async function fetchClass(classId: string): Promise<Class> {
 
 export async function getAllClasses(full: boolean): Promise<ClassDTO[] | string[]> {
     const classRepository = getClassRepository();
-    const classes = await classRepository.find({}, { populate: ['students', 'teachers'] });
-
-    if (!classes) {
-        return [];
-    }
+    const classes = await classRepository.findAll({ populate: ['students', 'teachers'] });
 
     if (full) {
         return classes.map(mapToClassDTO);
@@ -36,74 +35,71 @@ export async function getAllClasses(full: boolean): Promise<ClassDTO[] | string[
     return classes.map((cls) => cls.classId!);
 }
 
-export async function createClass(classData: ClassDTO): Promise<ClassDTO | null> {
-    const teacherRepository = getTeacherRepository();
-    const teacherUsernames = classData.teachers || [];
-    const teachers = (await Promise.all(teacherUsernames.map(async (id) => teacherRepository.findByUsername(id)))).filter(
-        (teacher) => teacher !== null
-    );
-
-    const studentRepository = getStudentRepository();
-    const studentUsernames = classData.students || [];
-    const students = (await Promise.all(studentUsernames.map(async (id) => studentRepository.findByUsername(id)))).filter(
-        (student) => student !== null
-    );
-
-    const classRepository = getClassRepository();
-
-    try {
-        const newClass = classRepository.create({
-            displayName: classData.displayName,
-            teachers: teachers,
-            students: students,
-        });
-        await classRepository.save(newClass);
-
-        return mapToClassDTO(newClass);
-    } catch (e) {
-        logger.error(e);
-        return null;
-    }
+export async function getClass(classId: string): Promise<ClassDTO> {
+    const cls = await fetchClass(classId);
+    return mapToClassDTO(cls);
 }
 
-export async function getClass(classId: string): Promise<ClassDTO | null> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classId);
+export async function createClass(classData: ClassDTO): Promise<ClassDTO> {
+    const teacherUsernames = classData.teachers || [];
+    const teachers = await Promise.all(teacherUsernames.map(async (id) => fetchTeacher(id)));
 
-    if (!cls) {
-        return null;
-    }
+    const studentUsernames = classData.students || [];
+    const students = await Promise.all(studentUsernames.map(async (id) => fetchStudent(id)));
+
+    const classRepository = getClassRepository();
+    const newClass = classRepository.create({
+        displayName: classData.displayName,
+        teachers: teachers,
+        students: students,
+    });
+    await classRepository.save(newClass, { preventOverwrite: true });
+
+    return mapToClassDTO(newClass);
+}
+
+export async function putClass(classId: string, classData: Partial<EntityDTO<Class>>): Promise<ClassDTO> {
+    const cls = await fetchClass(classId);
+
+    await putObject<Class>(cls, classData, getClassRepository());
 
     return mapToClassDTO(cls);
 }
 
-async function fetchClassStudents(classId: string): Promise<StudentDTO[]> {
+export async function deleteClass(classId: string): Promise<ClassDTO> {
+    const cls = await fetchClass(classId);
+
     const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classId);
+    await classRepository.deleteById(classId);
 
-    if (!cls) {
-        return [];
+    return mapToClassDTO(cls);
+}
+
+export async function getClassStudents(classId: string, full: boolean): Promise<StudentDTO[] | string[]> {
+    const cls = await fetchClass(classId);
+
+    if (full) {
+        return cls.students.map(mapToStudentDTO);
     }
+    return cls.students.map((student) => student.username);
+}
 
+export async function getClassStudentsDTO(classId: string): Promise<StudentDTO[]> {
+    const cls = await fetchClass(classId);
     return cls.students.map(mapToStudentDTO);
 }
 
-export async function getClassStudents(classId: string): Promise<StudentDTO[]> {
-    return await fetchClassStudents(classId);
-}
+export async function getClassTeachers(classId: string, full: boolean): Promise<TeacherDTO[] | string[]> {
+    const cls = await fetchClass(classId);
 
-export async function getClassStudentsIds(classId: string): Promise<string[]> {
-    const students: StudentDTO[] = await fetchClassStudents(classId);
-    return students.map((student) => student.username);
+    if (full) {
+        return cls.teachers.map(mapToTeacherDTO);
+    }
+    return cls.teachers.map((student) => student.username);
 }
 
 export async function getClassTeacherInvitations(classId: string, full: boolean): Promise<TeacherInvitationDTO[]> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classId);
-
-    if (!cls) {
-        return [];
-    }
+    const cls = await fetchClass(classId);
 
     const teacherInvitationRepository = getTeacherInvitationRepository();
     const invitations = await teacherInvitationRepository.findAllInvitationsForClass(cls);
@@ -114,3 +110,41 @@ export async function getClassTeacherInvitations(classId: string, full: boolean)
 
     return invitations.map(mapToTeacherInvitationDTOIds);
 }
+
+export async function deleteClassStudent(classId: string, username: string): Promise<ClassDTO> {
+    const cls = await fetchClass(classId);
+
+    const newStudents = { students: cls.students.filter((student) => student.username !== username) };
+    await putObject<Class>(cls, newStudents, getClassRepository());
+
+    return mapToClassDTO(cls);
+}
+
+export async function deleteClassTeacher(classId: string, username: string): Promise<ClassDTO> {
+    const cls = await fetchClass(classId);
+
+    const newTeachers = { teachers: cls.teachers.filter((teacher) => teacher.username !== username) };
+    await putObject<Class>(cls, newTeachers, getClassRepository());
+
+    return mapToClassDTO(cls);
+}
+
+export async function addClassStudent(classId: string, username: string): Promise<ClassDTO> {
+    const cls = await fetchClass(classId);
+    const newStudent = await fetchStudent(username);
+
+    const newStudents = { students: [...cls.students, newStudent] };
+    await putObject<Class>(cls, newStudents, getClassRepository());
+
+    return mapToClassDTO(cls);
+}
+
+export async function addClassTeacher(classId: string, username: string): Promise<ClassDTO> {
+    const cls = await fetchClass(classId);
+    const newTeacher = await fetchTeacher(username);
+
+    const newTeachers = { teachers: [...cls.teachers, newTeacher] };
+    await putObject<Class>(cls, newTeachers, getClassRepository());
+
+    return mapToClassDTO(cls);
+}

backend/src/services/groups.ts

@@ -1,109 +1,94 @@
-import {
-    getAssignmentRepository,
-    getClassRepository,
-    getGroupRepository,
-    getStudentRepository,
-    getSubmissionRepository,
-} from '../data/repositories.js';
+import { EntityDTO } from '@mikro-orm/core';
+import { getGroupRepository, getStudentRepository, getSubmissionRepository } from '../data/repositories.js';
 import { Group } from '../entities/assignments/group.entity.js';
-import { mapToGroupDTO, mapToGroupDTOId } from '../interfaces/group.js';
+import { mapToGroupDTO, mapToShallowGroupDTO } from '../interfaces/group.js';
 import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
 import { GroupDTO } from '@dwengo-1/common/interfaces/group';
 import { SubmissionDTO, SubmissionDTOId } from '@dwengo-1/common/interfaces/submission';
-import { getLogger } from '../logging/initalize.js';
+import { fetchAssignment } from './assignments.js';
+import { NotFoundException } from '../exceptions/not-found-exception.js';
+import { putObject } from './service-helper.js';
 
-export async function getGroup(classId: string, assignmentNumber: number, groupNumber: number, full: boolean): Promise<GroupDTO | null> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classId);
-
-    if (!cls) {
-        return null;
-    }
-
-    const assignmentRepository = getAssignmentRepository();
-    const assignment = await assignmentRepository.findByClassAndId(cls, assignmentNumber);
-
-    if (!assignment) {
-        return null;
-    }
+export async function fetchGroup(classId: string, assignmentNumber: number, groupNumber: number): Promise<Group> {
+    const assignment = await fetchAssignment(classId, assignmentNumber);
 
     const groupRepository = getGroupRepository();
     const group = await groupRepository.findByAssignmentAndGroupNumber(assignment, groupNumber);
 
     if (!group) {
-        return null;
+        throw new NotFoundException('Could not find group');
     }
 
-    if (full) {
-        return mapToGroupDTO(group);
-    }
-
-    return mapToGroupDTOId(group);
+    return group;
 }
 
-export async function createGroup(groupData: GroupDTO, classid: string, assignmentNumber: number): Promise<Group | null> {
+export async function getGroup(classId: string, assignmentNumber: number, groupNumber: number): Promise<GroupDTO> {
+    const group = await fetchGroup(classId, assignmentNumber, groupNumber);
+    return mapToGroupDTO(group);
+}
+
+export async function putGroup(
+    classId: string,
+    assignmentNumber: number,
+    groupNumber: number,
+    groupData: Partial<EntityDTO<Group>>
+): Promise<GroupDTO> {
+    const group = await fetchGroup(classId, assignmentNumber, groupNumber);
+
+    await putObject<Group>(group, groupData, getGroupRepository());
+
+    return mapToGroupDTO(group);
+}
+
+export async function deleteGroup(classId: string, assignmentNumber: number, groupNumber: number): Promise<GroupDTO> {
+    const group = await fetchGroup(classId, assignmentNumber, groupNumber);
+    const assignment = await fetchAssignment(classId, assignmentNumber);
+
+    const groupRepository = getGroupRepository();
+    await groupRepository.deleteByAssignmentAndGroupNumber(assignment, groupNumber);
+
+    return mapToGroupDTO(group);
+}
+
+export async function getExistingGroupFromGroupDTO(groupData: GroupDTO): Promise<Group> {
+    const classId = typeof groupData.class === 'string' ? groupData.class : groupData.class.id;
+    const assignmentNumber = typeof groupData.assignment === 'number' ? groupData.assignment : groupData.assignment.id;
+    const groupNumber = groupData.groupNumber;
+
+    return await fetchGroup(classId, assignmentNumber, groupNumber);
+}
+
+export async function createGroup(groupData: GroupDTO, classid: string, assignmentNumber: number): Promise<GroupDTO> {
     const studentRepository = getStudentRepository();
 
-    const memberUsernames = (groupData.members as string[]) || []; // TODO check if groupdata.members is a list
+    const memberUsernames = (groupData.members as string[]) || [];
     const members = (await Promise.all([...memberUsernames].map(async (id) => studentRepository.findByUsername(id)))).filter(
         (student) => student !== null
     );
 
-    getLogger().debug(members);
-
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classid);
-
-    if (!cls) {
-        return null;
-    }
-
-    const assignmentRepository = getAssignmentRepository();
-    const assignment = await assignmentRepository.findByClassAndId(cls, assignmentNumber);
-
-    if (!assignment) {
-        return null;
-    }
+    const assignment = await fetchAssignment(classid, assignmentNumber);
 
     const groupRepository = getGroupRepository();
-    try {
-        const newGroup = groupRepository.create({
-            assignment: assignment,
-            members: members,
-        });
-        await groupRepository.save(newGroup);
+    const newGroup = groupRepository.create({
+        assignment: assignment,
+        members: members,
+    });
+    await groupRepository.save(newGroup);
 
-        return newGroup;
-    } catch (e) {
-        getLogger().error(e);
-        return null;
-    }
+    return mapToGroupDTO(newGroup);
 }
 
 export async function getAllGroups(classId: string, assignmentNumber: number, full: boolean): Promise<GroupDTO[]> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classId);
-
-    if (!cls) {
-        return [];
-    }
-
-    const assignmentRepository = getAssignmentRepository();
-    const assignment = await assignmentRepository.findByClassAndId(cls, assignmentNumber);
-
-    if (!assignment) {
-        return [];
-    }
+    const assignment = await fetchAssignment(classId, assignmentNumber);
 
     const groupRepository = getGroupRepository();
     const groups = await groupRepository.findAllGroupsForAssignment(assignment);
 
     if (full) {
-        getLogger().debug({ full: full, groups: groups });
         return groups.map(mapToGroupDTO);
     }
 
-    return groups.map(mapToGroupDTOId);
+    return groups.map(mapToShallowGroupDTO);
 }
 
 export async function getGroupSubmissions(
@@ -112,26 +97,7 @@ export async function getGroupSubmissions(
     groupNumber: number,
     full: boolean
 ): Promise<SubmissionDTO[] | SubmissionDTOId[]> {
-    const classRepository = getClassRepository();
-    const cls = await classRepository.findById(classId);
-
-    if (!cls) {
-        return [];
-    }
-
-    const assignmentRepository = getAssignmentRepository();
-    const assignment = await assignmentRepository.findByClassAndId(cls, assignmentNumber);
-
-    if (!assignment) {
-        return [];
-    }
-
-    const groupRepository = getGroupRepository();
-    const group = await groupRepository.findByAssignmentAndGroupNumber(assignment, groupNumber);
-
-    if (!group) {
-        return [];
-    }
+    const group = await fetchGroup(classId, assignmentNumber, groupNumber);
 
     const submissionRepository = getSubmissionRepository();
     const submissions = await submissionRepository.findAllSubmissionsForGroup(group);

backend/src/services/learning-objects/attachment-service.ts

@@ -1,10 +1,10 @@
 import { getAttachmentRepository } from '../../data/repositories.js';
 import { Attachment } from '../../entities/content/attachment.entity.js';
 
-import { LearningObjectIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { LearningObjectIdentifierDTO } from '@dwengo-1/common/interfaces/learning-content';
 
 const attachmentService = {
-    async getAttachment(learningObjectId: LearningObjectIdentifier, attachmentName: string): Promise<Attachment | null> {
+    async getAttachment(learningObjectId: LearningObjectIdentifierDTO, attachmentName: string): Promise<Attachment | null> {
         const attachmentRepo = getAttachmentRepository();
 
         if (learningObjectId.version) {

backend/src/services/learning-objects/database-learning-object-provider.ts

@@ -6,7 +6,7 @@ import processingService from './processing/processing-service.js';
 import { NotFoundError } from '@mikro-orm/core';
 import learningObjectService from './learning-object-service.js';
 import { getLogger, Logger } from '../../logging/initalize.js';
-import { FilteredLearningObject, LearningObjectIdentifier, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { FilteredLearningObject, LearningObjectIdentifierDTO, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
 
 const logger: Logger = getLogger();
 
@@ -40,7 +40,7 @@ function convertLearningObject(learningObject: LearningObject | null): FilteredL
     };
 }
 
-async function findLearningObjectEntityById(id: LearningObjectIdentifier): Promise<LearningObject | null> {
+async function findLearningObjectEntityById(id: LearningObjectIdentifierDTO): Promise<LearningObject | null> {
     const learningObjectRepo = getLearningObjectRepository();
 
     return learningObjectRepo.findLatestByHruidAndLanguage(id.hruid, id.language);
@@ -53,7 +53,7 @@ const databaseLearningObjectProvider: LearningObjectProvider = {
     /**
      * Fetches a single learning object by its HRUID
      */
-    async getLearningObjectById(id: LearningObjectIdentifier): Promise<FilteredLearningObject | null> {
+    async getLearningObjectById(id: LearningObjectIdentifierDTO): Promise<FilteredLearningObject | null> {
         const learningObject = await findLearningObjectEntityById(id);
         return convertLearningObject(learningObject);
     },
@@ -61,7 +61,7 @@ const databaseLearningObjectProvider: LearningObjectProvider = {
     /**
      * Obtain a HTML-rendering of the learning object with the given identifier (as a string).
      */
-    async getLearningObjectHTML(id: LearningObjectIdentifier): Promise<string | null> {
+    async getLearningObjectHTML(id: LearningObjectIdentifierDTO): Promise<string | null> {
         const learningObjectRepo = getLearningObjectRepository();
 
         const learningObject = await learningObjectRepo.findLatestByHruidAndLanguage(id.hruid, id.language);

backend/src/services/learning-objects/dwengo-api-learning-object-provider.ts

@@ -5,7 +5,7 @@ import { LearningObjectProvider } from './learning-object-provider.js';
 import { getLogger, Logger } from '../../logging/initalize.js';
 import {
     FilteredLearningObject,
-    LearningObjectIdentifier,
+    LearningObjectIdentifierDTO,
     LearningObjectMetadata,
     LearningObjectNode,
     LearningPathIdentifier,
@@ -67,7 +67,7 @@ async function fetchLearningObjects(learningPathId: LearningPathIdentifier, full
 
         const objects = await Promise.all(
             nodes.map(async (node) => {
-                const learningObjectId: LearningObjectIdentifier = {
+                const learningObjectId: LearningObjectIdentifierDTO = {
                     hruid: node.learningobject_hruid,
                     language: learningPathId.language,
                 };
@@ -85,7 +85,7 @@ const dwengoApiLearningObjectProvider: LearningObjectProvider = {
     /**
      * Fetches a single learning object by its HRUID
      */
-    async getLearningObjectById(id: LearningObjectIdentifier): Promise<FilteredLearningObject | null> {
+    async getLearningObjectById(id: LearningObjectIdentifierDTO): Promise<FilteredLearningObject | null> {
         const metadataUrl = `${DWENGO_API_BASE}/learningObject/getMetadata`;
         const metadata = await fetchWithLogging<LearningObjectMetadata>(
             metadataUrl,
@@ -121,7 +121,7 @@ const dwengoApiLearningObjectProvider: LearningObjectProvider = {
      * Obtain a HTML-rendering of the learning object with the given identifier (as a string). For learning objects
      * from the Dwengo API, this means passing through the HTML rendering from there.
      */
-    async getLearningObjectHTML(id: LearningObjectIdentifier): Promise<string | null> {
+    async getLearningObjectHTML(id: LearningObjectIdentifierDTO): Promise<string | null> {
         const htmlUrl = `${DWENGO_API_BASE}/learningObject/getRaw`;
         const html = await fetchWithLogging<string>(htmlUrl, `Metadata for Learning Object HRUID "${id.hruid}" (language ${id.language})`, {
             params: { ...id },

backend/src/services/learning-objects/learning-object-provider.ts

@@ -1,10 +1,10 @@
-import { FilteredLearningObject, LearningObjectIdentifier, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { FilteredLearningObject, LearningObjectIdentifierDTO, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
 
 export interface LearningObjectProvider {
     /**
      * Fetches a single learning object by its HRUID
      */
-    getLearningObjectById(id: LearningObjectIdentifier): Promise<FilteredLearningObject | null>;
+    getLearningObjectById(id: LearningObjectIdentifierDTO): Promise<FilteredLearningObject | null>;
 
     /**
      * Fetch full learning object data (metadata)
@@ -19,5 +19,5 @@ export interface LearningObjectProvider {
     /**
      * Obtain a HTML-rendering of the learning object with the given identifier (as a string).
      */
-    getLearningObjectHTML(id: LearningObjectIdentifier): Promise<string | null>;
+    getLearningObjectHTML(id: LearningObjectIdentifierDTO): Promise<string | null>;
 }

backend/src/services/learning-objects/learning-object-service.ts

@@ -2,9 +2,9 @@ import dwengoApiLearningObjectProvider from './dwengo-api-learning-object-provid
 import { LearningObjectProvider } from './learning-object-provider.js';
 import { envVars, getEnvVar } from '../../util/envVars.js';
 import databaseLearningObjectProvider from './database-learning-object-provider.js';
-import { FilteredLearningObject, LearningObjectIdentifier, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { FilteredLearningObject, LearningObjectIdentifierDTO, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
 
-function getProvider(id: LearningObjectIdentifier): LearningObjectProvider {
+function getProvider(id: LearningObjectIdentifierDTO): LearningObjectProvider {
     if (id.hruid.startsWith(getEnvVar(envVars.UserContentPrefix))) {
         return databaseLearningObjectProvider;
     }
@@ -18,7 +18,7 @@ const learningObjectService = {
     /**
      * Fetches a single learning object by its HRUID
      */
-    async getLearningObjectById(id: LearningObjectIdentifier): Promise<FilteredLearningObject | null> {
+    async getLearningObjectById(id: LearningObjectIdentifierDTO): Promise<FilteredLearningObject | null> {
         return getProvider(id).getLearningObjectById(id);
     },
 
@@ -39,7 +39,7 @@ const learningObjectService = {
     /**
      * Obtain a HTML-rendering of the learning object with the given identifier (as a string).
      */
-    async getLearningObjectHTML(id: LearningObjectIdentifier): Promise<string | null> {
+    async getLearningObjectHTML(id: LearningObjectIdentifierDTO): Promise<string | null> {
         return getProvider(id).getLearningObjectHTML(id);
     },
 };

backend/src/services/learning-objects/processing/markdown/dwengo-marked-renderer.ts

@@ -12,7 +12,7 @@ import Image = marked.Tokens.Image;
 import Heading = marked.Tokens.Heading;
 import Link = marked.Tokens.Link;
 import RendererObject = marked.RendererObject;
-import { LearningObjectIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { LearningObjectIdentifierDTO } from '@dwengo-1/common/interfaces/learning-content';
 import { Language } from '@dwengo-1/common/util/language';
 
 const prefixes = {
@@ -25,7 +25,7 @@ const prefixes = {
     blockly: '@blockly',
 };
 
-function extractLearningObjectIdFromHref(href: string): LearningObjectIdentifier {
+function extractLearningObjectIdFromHref(href: string): LearningObjectIdentifierDTO {
     const [hruid, language, version] = href.split(/\/(.+)/, 2)[1].split('/');
     return {
         hruid,

backend/src/services/learning-objects/processing/processing-service.ts

@@ -14,7 +14,7 @@ import { LearningObject } from '../../../entities/content/learning-object.entity
 import Processor from './processor.js';
 import { DwengoContentType } from './content-type.js';
 import { replaceAsync } from '../../../util/async.js';
-import { LearningObjectIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { LearningObjectIdentifierDTO } from '@dwengo-1/common/interfaces/learning-content';
 import { Language } from '@dwengo-1/common/util/language';
 
 const EMBEDDED_LEARNING_OBJECT_PLACEHOLDER = /<learning-object hruid="([^"]+)" language="([^"]+)" version="([^"]+)"\/>/g;
@@ -50,7 +50,7 @@ class ProcessingService {
      */
     async render(
         learningObject: LearningObject,
-        fetchEmbeddedLearningObjects?: (loId: LearningObjectIdentifier) => Promise<LearningObject | null>
+        fetchEmbeddedLearningObjects?: (loId: LearningObjectIdentifierDTO) => Promise<LearningObject | null>
     ): Promise<string> {
         const html = this.processors.get(learningObject.contentType)!.renderLearningObject(learningObject);
         if (fetchEmbeddedLearningObjects) {

backend/src/services/questions.ts

@@ -1,22 +1,39 @@
-import { getAnswerRepository, getQuestionRepository } from '../data/repositories.js';
-import { mapToQuestionDTO, mapToQuestionDTOId } from '../interfaces/question.js';
+import { getAnswerRepository, getAssignmentRepository, getClassRepository, getGroupRepository, getQuestionRepository } from '../data/repositories.js';
+import { mapToLearningObjectID, mapToQuestionDTO, mapToQuestionDTOId } from '../interfaces/question.js';
 import { Question } from '../entities/questions/question.entity.js';
 import { Answer } from '../entities/questions/answer.entity.js';
 import { mapToAnswerDTO, mapToAnswerDTOId } from '../interfaces/answer.js';
 import { QuestionRepository } from '../data/questions/question-repository.js';
 import { LearningObjectIdentifier } from '../entities/content/learning-object-identifier.js';
-import { mapToStudent } from '../interfaces/student.js';
-import { QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
+import { QuestionData, QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
 import { AnswerDTO, AnswerId } from '@dwengo-1/common/interfaces/answer';
+import { mapToAssignment } from '../interfaces/assignment.js';
+import { AssignmentDTO } from '@dwengo-1/common/interfaces/assignment';
+import { fetchStudent } from './students.js';
+import { NotFoundException } from '../exceptions/not-found-exception.js';
+import { FALLBACK_VERSION_NUM } from '../config.js';
+
+export async function getQuestionsAboutLearningObjectInAssignment(
+    loId: LearningObjectIdentifier,
+    classId: string,
+    assignmentId: number,
+    full: boolean,
+    studentUsername?: string
+): Promise<QuestionDTO[] | QuestionId[]> {
+    const assignment = await getAssignmentRepository().findByClassIdAndAssignmentId(classId, assignmentId);
+
+    const questions = await getQuestionRepository().findAllQuestionsAboutLearningObjectInAssignment(loId, assignment!, studentUsername);
+
+    if (full) {
+        return questions.map((q) => mapToQuestionDTO(q));
+    }
+    return questions.map((q) => mapToQuestionDTOId(q));
+}
 
 export async function getAllQuestions(id: LearningObjectIdentifier, full: boolean): Promise<QuestionDTO[] | QuestionId[]> {
     const questionRepository: QuestionRepository = getQuestionRepository();
     const questions = await questionRepository.findAllQuestionsAboutLearningObject(id);
 
-    if (!questions) {
-        return [];
-    }
-
     if (full) {
         return questions.map(mapToQuestionDTO);
     }
@@ -24,24 +41,22 @@ export async function getAllQuestions(id: LearningObjectIdentifier, full: boolea
     return questions.map(mapToQuestionDTOId);
 }
 
-async function fetchQuestion(questionId: QuestionId): Promise<Question | null> {
+export async function fetchQuestion(questionId: QuestionId): Promise<Question> {
     const questionRepository = getQuestionRepository();
-
-    return await questionRepository.findOne({
-        learningObjectHruid: questionId.learningObjectIdentifier.hruid,
-        learningObjectLanguage: questionId.learningObjectIdentifier.language,
-        learningObjectVersion: questionId.learningObjectIdentifier.version,
-        sequenceNumber: questionId.sequenceNumber,
-    });
-}
-
-export async function getQuestion(questionId: QuestionId): Promise<QuestionDTO | null> {
-    const question = await fetchQuestion(questionId);
+    const question = await questionRepository.findByLearningObjectAndSequenceNumber(
+        mapToLearningObjectID(questionId.learningObjectIdentifier),
+        questionId.sequenceNumber
+    );
 
     if (!question) {
-        return null;
+        throw new NotFoundException('Question with loID and sequence number not found');
     }
 
+    return question;
+}
+
+export async function getQuestion(questionId: QuestionId): Promise<QuestionDTO> {
+    const question = await fetchQuestion(questionId);
     return mapToQuestionDTO(question);
 }
 
@@ -66,48 +81,43 @@ export async function getAnswersByQuestion(questionId: QuestionId, full: boolean
     return answers.map(mapToAnswerDTOId);
 }
 
-export async function createQuestion(questionDTO: QuestionDTO): Promise<QuestionDTO | null> {
+export async function createQuestion(loId: LearningObjectIdentifier, questionData: QuestionData): Promise<QuestionDTO> {
     const questionRepository = getQuestionRepository();
+    const author = await fetchStudent(questionData.author!);
+    const content = questionData.content;
 
-    const author = mapToStudent(questionDTO.author);
+    const clazz = await getClassRepository().findById((questionData.inGroup.assignment as AssignmentDTO).within);
+    const assignment = mapToAssignment(questionData.inGroup.assignment as AssignmentDTO, clazz!);
+    const inGroup = await getGroupRepository().findByAssignmentAndGroupNumber(assignment, questionData.inGroup.groupNumber);
 
-    const loId: LearningObjectIdentifier = {
-        ...questionDTO.learningObjectIdentifier,
-        version: questionDTO.learningObjectIdentifier.version ?? 1,
-    };
-
-    try {
-        await questionRepository.createQuestion({
-            loId,
-            author,
-            content: questionDTO.content,
-        });
-    } catch (_) {
-        return null;
-    }
-
-    return questionDTO;
-}
-
-export async function deleteQuestion(questionId: QuestionId): Promise<QuestionDTO | null> {
-    const questionRepository = getQuestionRepository();
-
-    const question = await fetchQuestion(questionId);
-
-    if (!question) {
-        return null;
-    }
-
-    const loId: LearningObjectIdentifier = {
-        ...questionId.learningObjectIdentifier,
-        version: questionId.learningObjectIdentifier.version ?? 1,
-    };
-
-    try {
-        await questionRepository.removeQuestionByLearningObjectAndSequenceNumber(loId, questionId.sequenceNumber);
-    } catch (_) {
-        return null;
-    }
+    const question = await questionRepository.createQuestion({
+        loId,
+        author,
+        inGroup: inGroup!,
+        content,
+    });
 
     return mapToQuestionDTO(question);
 }
+
+export async function deleteQuestion(questionId: QuestionId): Promise<QuestionDTO> {
+    const questionRepository = getQuestionRepository();
+    const question = await fetchQuestion(questionId); // Throws error if not found
+
+    const loId: LearningObjectIdentifier = {
+        hruid: questionId.learningObjectIdentifier.hruid,
+        language: questionId.learningObjectIdentifier.language,
+        version: questionId.learningObjectIdentifier.version || FALLBACK_VERSION_NUM,
+    };
+
+    await questionRepository.removeQuestionByLearningObjectAndSequenceNumber(loId, questionId.sequenceNumber);
+    return mapToQuestionDTO(question);
+}
+
+export async function updateQuestion(questionId: QuestionId, questionData: QuestionData): Promise<QuestionDTO> {
+    const questionRepository = getQuestionRepository();
+    const question = await fetchQuestion(questionId);
+
+    const newQuestion = await questionRepository.updateContent(question, questionData.content);
+    return mapToQuestionDTO(newQuestion);
+}

backend/src/services/service-helper.ts

@@ -0,0 +1,20 @@
+import { EntityDTO, FromEntityType } from '@mikro-orm/core';
+import { DwengoEntityRepository } from '../data/dwengo-entity-repository';
+
+/**
+ * Utility function to perform an PUT on an object.
+ *
+ * @param object The object that needs to be changed
+ * @param data The datafields and their values that will be updated
+ * @param repo The repository on which this action needs to be performed
+ *
+ * @returns Nothing.
+ */
+export async function putObject<T extends object>(
+    object: T,
+    data: Partial<EntityDTO<FromEntityType<T>>>,
+    repo: DwengoEntityRepository<T>
+): Promise<void> {
+    repo.assign(object, data);
+    await repo.getEntityManager().flush();
+}

backend/src/services/students.ts

@@ -7,7 +7,7 @@ import {
     getSubmissionRepository,
 } from '../data/repositories.js';
 import { mapToClassDTO } from '../interfaces/class.js';
-import { mapToGroupDTO, mapToGroupDTOId } from '../interfaces/group.js';
+import { mapToGroupDTO, mapToShallowGroupDTO } from '../interfaces/group.js';
 import { mapToStudent, mapToStudentDTO } from '../interfaces/student.js';
 import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
 import { getAllAssignments } from './assignments.js';
@@ -23,6 +23,8 @@ import { GroupDTO } from '@dwengo-1/common/interfaces/group';
 import { SubmissionDTO, SubmissionDTOId } from '@dwengo-1/common/interfaces/submission';
 import { QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
 import { ClassJoinRequestDTO } from '@dwengo-1/common/interfaces/class-join-request';
+import { ConflictException } from '../exceptions/conflict-exception.js';
+import { Submission } from '../entities/assignments/submission.entity';
 
 export async function getAllStudents(full: boolean): Promise<StudentDTO[] | string[]> {
     const studentRepository = getStudentRepository();
@@ -100,14 +102,15 @@ export async function getStudentGroups(username: string, full: boolean): Promise
         return groups.map(mapToGroupDTO);
     }
 
-    return groups.map(mapToGroupDTOId);
+    return groups.map(mapToShallowGroupDTO);
 }
 
 export async function getStudentSubmissions(username: string, full: boolean): Promise<SubmissionDTO[] | SubmissionDTOId[]> {
     const student = await fetchStudent(username);
 
     const submissionRepository = getSubmissionRepository();
-    const submissions = await submissionRepository.findAllSubmissionsForStudent(student);
+
+    const submissions: Submission[] = await submissionRepository.findAllSubmissionsForStudent(student);
 
     if (full) {
         return submissions.map(mapToSubmissionDTO);
@@ -135,6 +138,10 @@ export async function createClassJoinRequest(username: string, classId: string):
     const student = await fetchStudent(username); // Throws error if student not found
     const cls = await fetchClass(classId);
 
+    if (cls.students.contains(student)) {
+        throw new ConflictException('Student already in this class');
+    }
+
     const request = mapToStudentRequest(student, cls);
     await requestRepo.save(request, { preventOverwrite: true });
     return mapToStudentRequestDTO(request);

backend/src/services/submissions.ts

@@ -1,57 +1,71 @@
-import { getSubmissionRepository } from '../data/repositories.js';
+import { getAssignmentRepository, getSubmissionRepository } from '../data/repositories.js';
 import { LearningObjectIdentifier } from '../entities/content/learning-object-identifier.js';
+import { NotFoundException } from '../exceptions/not-found-exception.js';
 import { mapToSubmission, mapToSubmissionDTO } from '../interfaces/submission.js';
 import { SubmissionDTO } from '@dwengo-1/common/interfaces/submission';
+import { fetchStudent } from './students.js';
+import { getExistingGroupFromGroupDTO } from './groups.js';
+import { Submission } from '../entities/assignments/submission.entity.js';
 import { Language } from '@dwengo-1/common/util/language';
 
-export async function getSubmission(
-    learningObjectHruid: string,
-    language: Language,
-    version: number,
-    submissionNumber: number
-): Promise<SubmissionDTO | null> {
-    const loId = new LearningObjectIdentifier(learningObjectHruid, language, version);
-
+export async function fetchSubmission(loId: LearningObjectIdentifier, submissionNumber: number): Promise<Submission> {
     const submissionRepository = getSubmissionRepository();
     const submission = await submissionRepository.findSubmissionByLearningObjectAndSubmissionNumber(loId, submissionNumber);
 
     if (!submission) {
-        return null;
+        throw new NotFoundException('Could not find submission');
     }
 
-    return mapToSubmissionDTO(submission);
-}
-
-export async function createSubmission(submissionDTO: SubmissionDTO): Promise<SubmissionDTO | null> {
-    const submissionRepository = getSubmissionRepository();
-    const submission = mapToSubmission(submissionDTO);
-
-    try {
-        const newSubmission = submissionRepository.create(submission);
-        await submissionRepository.save(newSubmission);
-    } catch (_) {
-        return null;
-    }
-
-    return mapToSubmissionDTO(submission);
-}
-
-export async function deleteSubmission(
-    learningObjectHruid: string,
-    language: Language,
-    version: number,
-    submissionNumber: number
-): Promise<SubmissionDTO | null> {
-    const submissionRepository = getSubmissionRepository();
-
-    const submission = getSubmission(learningObjectHruid, language, version, submissionNumber);
-
-    if (!submission) {
-        return null;
-    }
-
-    const loId = new LearningObjectIdentifier(learningObjectHruid, language, version);
-    await submissionRepository.deleteSubmissionByLearningObjectAndSubmissionNumber(loId, submissionNumber);
-
     return submission;
 }
+
+export async function getSubmission(loId: LearningObjectIdentifier, submissionNumber: number): Promise<SubmissionDTO> {
+    const submission = await fetchSubmission(loId, submissionNumber);
+    return mapToSubmissionDTO(submission);
+}
+
+export async function getAllSubmissions(loId: LearningObjectIdentifier): Promise<SubmissionDTO[]> {
+    const submissionRepository = getSubmissionRepository();
+    const submissions = await submissionRepository.findByLearningObject(loId);
+
+    return submissions.map(mapToSubmissionDTO);
+}
+
+export async function createSubmission(submissionDTO: SubmissionDTO): Promise<SubmissionDTO> {
+    const submitter = await fetchStudent(submissionDTO.submitter.username);
+    const group = await getExistingGroupFromGroupDTO(submissionDTO.group);
+
+    const submissionRepository = getSubmissionRepository();
+    const submission = mapToSubmission(submissionDTO, submitter, group);
+    await submissionRepository.save(submission);
+
+    return mapToSubmissionDTO(submission);
+}
+
+export async function deleteSubmission(loId: LearningObjectIdentifier, submissionNumber: number): Promise<SubmissionDTO> {
+    const submission = await fetchSubmission(loId, submissionNumber);
+
+    const submissionRepository = getSubmissionRepository();
+    await submissionRepository.deleteSubmissionByLearningObjectAndSubmissionNumber(loId, submissionNumber);
+
+    return mapToSubmissionDTO(submission);
+}
+
+/**
+ * Returns all the submissions made by on behalf of any group the given student is in.
+ */
+export async function getSubmissionsForLearningObjectAndAssignment(
+    learningObjectHruid: string,
+    language: Language,
+    version: number,
+    classId: string,
+    assignmentId: number,
+    studentUsername?: string
+): Promise<SubmissionDTO[]> {
+    const loId = new LearningObjectIdentifier(learningObjectHruid, language, version);
+    const assignment = await getAssignmentRepository().findByClassIdAndAssignmentId(classId, assignmentId);
+
+    const submissions = await getSubmissionRepository().findAllSubmissionsForLearningObjectAndAssignment(loId, assignment!, studentUsername);
+
+    return submissions.map((s) => mapToSubmissionDTO(s));
+}

backend/src/services/teacher-invitations.ts

@@ -0,0 +1,87 @@
+import { fetchTeacher } from './teachers.js';
+import { getTeacherInvitationRepository } from '../data/repositories.js';
+import { mapToInvitation, mapToTeacherInvitationDTO } from '../interfaces/teacher-invitation.js';
+import { addClassTeacher, fetchClass } from './classes.js';
+import { TeacherInvitationData, TeacherInvitationDTO } from '@dwengo-1/common/interfaces/teacher-invitation';
+import { ConflictException } from '../exceptions/conflict-exception.js';
+import { NotFoundException } from '../exceptions/not-found-exception.js';
+import { TeacherInvitation } from '../entities/classes/teacher-invitation.entity.js';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
+
+export async function getAllInvitations(username: string, sent: boolean): Promise<TeacherInvitationDTO[]> {
+    const teacher = await fetchTeacher(username);
+    const teacherInvitationRepository = getTeacherInvitationRepository();
+
+    let invitations;
+    if (sent) {
+        invitations = await teacherInvitationRepository.findAllInvitationsBy(teacher);
+    } else {
+        invitations = await teacherInvitationRepository.findAllInvitationsFor(teacher);
+    }
+    return invitations.map(mapToTeacherInvitationDTO);
+}
+
+export async function createInvitation(data: TeacherInvitationData): Promise<TeacherInvitationDTO> {
+    const teacherInvitationRepository = getTeacherInvitationRepository();
+    const sender = await fetchTeacher(data.sender);
+    const receiver = await fetchTeacher(data.receiver);
+
+    const cls = await fetchClass(data.class);
+
+    if (!cls.teachers.contains(sender)) {
+        throw new ConflictException('The teacher sending the invite is not part of the class');
+    }
+
+    const newInvitation = mapToInvitation(sender, receiver, cls);
+    await teacherInvitationRepository.save(newInvitation, { preventOverwrite: true });
+
+    return mapToTeacherInvitationDTO(newInvitation);
+}
+
+async function fetchInvitation(usernameSender: string, usernameReceiver: string, classId: string): Promise<TeacherInvitation> {
+    const sender = await fetchTeacher(usernameSender);
+    const receiver = await fetchTeacher(usernameReceiver);
+    const cls = await fetchClass(classId);
+
+    const teacherInvitationRepository = getTeacherInvitationRepository();
+    const invite = await teacherInvitationRepository.findBy(cls, sender, receiver);
+
+    if (!invite) {
+        throw new NotFoundException('Teacher invite not found');
+    }
+
+    return invite;
+}
+
+export async function getInvitation(sender: string, receiver: string, classId: string): Promise<TeacherInvitationDTO> {
+    const invitation = await fetchInvitation(sender, receiver, classId);
+    return mapToTeacherInvitationDTO(invitation);
+}
+
+export async function updateInvitation(data: TeacherInvitationData): Promise<TeacherInvitationDTO> {
+    const invitation = await fetchInvitation(data.sender, data.receiver, data.class);
+    invitation.status = ClassStatus.Declined;
+
+    if (data.accepted) {
+        invitation.status = ClassStatus.Accepted;
+        await addClassTeacher(data.class, data.receiver);
+    }
+
+    const teacherInvitationRepository = getTeacherInvitationRepository();
+    await teacherInvitationRepository.save(invitation);
+
+    return mapToTeacherInvitationDTO(invitation);
+}
+
+export async function deleteInvitation(data: TeacherInvitationData): Promise<TeacherInvitationDTO> {
+    const invitation = await fetchInvitation(data.sender, data.receiver, data.class);
+
+    const sender = await fetchTeacher(data.sender);
+    const receiver = await fetchTeacher(data.receiver);
+    const cls = await fetchClass(data.class);
+
+    const teacherInvitationRepository = getTeacherInvitationRepository();
+    await teacherInvitationRepository.deleteBy(cls, sender, receiver);
+
+    return mapToTeacherInvitationDTO(invitation);
+}

backend/src/services/teachers.ts

@@ -22,13 +22,14 @@ import { Question } from '../entities/questions/question.entity.js';
 import { ClassJoinRequestRepository } from '../data/classes/class-join-request-repository.js';
 import { Student } from '../entities/users/student.entity.js';
 import { NotFoundException } from '../exceptions/not-found-exception.js';
-import { getClassStudents } from './classes.js';
+import { addClassStudent, fetchClass, getClassStudentsDTO } from './classes.js';
 import { TeacherDTO } from '@dwengo-1/common/interfaces/teacher';
 import { ClassDTO } from '@dwengo-1/common/interfaces/class';
 import { StudentDTO } from '@dwengo-1/common/interfaces/student';
 import { QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
 import { ClassJoinRequestDTO } from '@dwengo-1/common/interfaces/class-join-request';
-import { ClassJoinRequestStatus } from '@dwengo-1/common/util/class-join-request';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
+import { ConflictException } from '../exceptions/conflict-exception.js';
 
 export async function getAllTeachers(full: boolean): Promise<TeacherDTO[] | string[]> {
     const teacherRepository: TeacherRepository = getTeacherRepository();
@@ -99,10 +100,12 @@ export async function getStudentsByTeacher(username: string, full: boolean): Pro
 
     const classIds: string[] = classes.map((cls) => cls.id);
 
-    const students: StudentDTO[] = (await Promise.all(classIds.map(async (id) => getClassStudents(id)))).flat();
+    const students: StudentDTO[] = (await Promise.all(classIds.map(async (username) => await getClassStudentsDTO(username)))).flat();
+
     if (full) {
         return students;
     }
+
     return students.map((student) => student.username);
 }
 
@@ -143,13 +146,12 @@ export async function getJoinRequestsByClass(classId: string): Promise<ClassJoin
 
 export async function updateClassJoinRequestStatus(studentUsername: string, classId: string, accepted = true): Promise<ClassJoinRequestDTO> {
     const requestRepo: ClassJoinRequestRepository = getClassJoinRequestRepository();
-    const classRepo: ClassRepository = getClassRepository();
 
     const student: Student = await fetchStudent(studentUsername);
-    const cls: Class | null = await classRepo.findById(classId);
+    const cls = await fetchClass(classId);
 
-    if (!cls) {
-        throw new NotFoundException('Class not found');
+    if (cls.students.contains(student)) {
+        throw new ConflictException('Student already in this class');
     }
 
     const request: ClassJoinRequest | null = await requestRepo.findByStudentAndClass(student, cls);
@@ -158,8 +160,14 @@ export async function updateClassJoinRequestStatus(studentUsername: string, clas
         throw new NotFoundException('Join request not found');
     }
 
-    request.status = accepted ? ClassJoinRequestStatus.Accepted : ClassJoinRequestStatus.Declined;
+    request.status = ClassStatus.Declined;
+
+    if (accepted) {
+        request.status = ClassStatus.Accepted;
+        await addClassStudent(classId, studentUsername);
+    }
 
     await requestRepo.save(request);
+
     return mapToStudentRequestDTO(request);
 }

backend/src/util/links.ts

@@ -1,4 +1,4 @@
-import { LearningObjectIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { LearningObjectIdentifierDTO } from '@dwengo-1/common/interfaces/learning-content';
 
 export function isValidHttpUrl(url: string): boolean {
     try {
@@ -9,7 +9,7 @@ export function isValidHttpUrl(url: string): boolean {
     }
 }
 
-export function getUrlStringForLearningObject(learningObjectId: LearningObjectIdentifier): string {
+export function getUrlStringForLearningObject(learningObjectId: LearningObjectIdentifierDTO): string {
     let url = `/learningObject/${learningObjectId.hruid}/html?language=${learningObjectId.language}`;
     if (learningObjectId.version) {
         url += `&version=${learningObjectId.version}`;
@@ -17,7 +17,7 @@ export function getUrlStringForLearningObject(learningObjectId: LearningObjectId
     return url;
 }
 
-export function getUrlStringForLearningObjectHTML(learningObjectIdentifier: LearningObjectIdentifier): string {
+export function getUrlStringForLearningObjectHTML(learningObjectIdentifier: LearningObjectIdentifierDTO): string {
     let url = `/learningObject/${learningObjectIdentifier.hruid}/html?language=${learningObjectIdentifier.language}`;
     if (learningObjectIdentifier.version) {
         url += `&version=${learningObjectIdentifier.version}`;

backend/tests/controllers/answers.test.ts

@@ -0,0 +1,87 @@
+import { Request, Response } from 'express';
+import { beforeAll, beforeEach, describe, expect, it, Mock, vi } from 'vitest';
+import { setupTestApp } from '../setup-tests';
+import { Language } from '@dwengo-1/common/util/language';
+import { getAllAnswersHandler, getAnswerHandler, updateAnswerHandler } from '../../src/controllers/answers';
+import { BadRequestException } from '../../src/exceptions/bad-request-exception';
+import { NotFoundException } from '../../src/exceptions/not-found-exception';
+
+describe('Questions controllers', () => {
+    let req: Partial<Request>;
+    let res: Partial<Response>;
+
+    let jsonMock: Mock;
+
+    beforeAll(async () => {
+        await setupTestApp();
+    });
+
+    beforeEach(() => {
+        jsonMock = vi.fn();
+        res = {
+            json: jsonMock,
+        };
+    });
+
+    it('Get answers list', async () => {
+        req = {
+            params: { hruid: 'id05', version: '1', seq: '2' },
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await getAllAnswersHandler(req as Request, res as Response);
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ answers: expect.anything() }));
+
+        const result = jsonMock.mock.lastCall?.[0];
+        // Console.log(result.answers);
+        expect(result.answers).to.have.length.greaterThan(1);
+    });
+
+    it('Get answer', async () => {
+        req = {
+            params: { hruid: 'id05', version: '1', seq: '2', seqAnswer: '2' },
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await getAnswerHandler(req as Request, res as Response);
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ answer: expect.anything() }));
+
+        // Const result = jsonMock.mock.lastCall?.[0];
+        // Console.log(result.answer);
+    });
+
+    it('Get answer hruid does not exist', async () => {
+        req = {
+            params: { hruid: 'id_not_exist' },
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await expect(async () => getAnswerHandler(req as Request, res as Response)).rejects.toThrow(NotFoundException);
+    });
+
+    it('Get answer no hruid given', async () => {
+        req = {
+            params: {},
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await expect(async () => getAnswerHandler(req as Request, res as Response)).rejects.toThrow(BadRequestException);
+    });
+
+    it('Update question', async () => {
+        const newContent = 'updated question';
+        req = {
+            params: { hruid: 'id05', version: '1', seq: '2', seqAnswer: '2' },
+            query: { lang: Language.English },
+            body: { content: newContent },
+        };
+
+        await updateAnswerHandler(req as Request, res as Response);
+
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ answer: expect.anything() }));
+
+        const result = jsonMock.mock.lastCall?.[0];
+        // Console.log(result.question);
+        expect(result.answer.content).to.eq(newContent);
+    });
+});

backend/tests/controllers/questions.test.ts

@@ -0,0 +1,117 @@
+import { beforeAll, beforeEach, describe, expect, it, Mock, vi } from 'vitest';
+import { Request, Response } from 'express';
+import { setupTestApp } from '../setup-tests';
+import { getAllQuestionsHandler, getQuestionHandler, updateQuestionHandler } from '../../src/controllers/questions';
+import { Language } from '@dwengo-1/common/util/language';
+import { NotFoundException } from '../../src/exceptions/not-found-exception';
+import { BadRequestException } from '../../src/exceptions/bad-request-exception';
+
+describe('Questions controllers', () => {
+    let req: Partial<Request>;
+    let res: Partial<Response>;
+
+    let jsonMock: Mock;
+
+    beforeAll(async () => {
+        await setupTestApp();
+    });
+
+    beforeEach(() => {
+        jsonMock = vi.fn();
+        res = {
+            json: jsonMock,
+        };
+    });
+
+    it('Get question list', async () => {
+        req = {
+            params: { hruid: 'id05', version: '1' },
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await getAllQuestionsHandler(req as Request, res as Response);
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ questions: expect.anything() }));
+
+        const result = jsonMock.mock.lastCall?.[0];
+        // Console.log(result.questions);
+        expect(result.questions).to.have.length.greaterThan(1);
+    });
+
+    it('Get question', async () => {
+        req = {
+            params: { hruid: 'id05', version: '1', seq: '1' },
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await getQuestionHandler(req as Request, res as Response);
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ question: expect.anything() }));
+
+        // Const result = jsonMock.mock.lastCall?.[0];
+        // Console.log(result.question);
+    });
+
+    it('Get question with fallback sequence number and version', async () => {
+        req = {
+            params: { hruid: 'id05' },
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await getQuestionHandler(req as Request, res as Response);
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ question: expect.anything() }));
+
+        // Const result = jsonMock.mock.lastCall?.[0];
+        // Console.log(result.question);
+    });
+
+    it('Get question hruid does not exist', async () => {
+        req = {
+            params: { hruid: 'id_not_exist' },
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await expect(async () => getQuestionHandler(req as Request, res as Response)).rejects.toThrow(NotFoundException);
+    });
+
+    it('Get question no hruid given', async () => {
+        req = {
+            params: {},
+            query: { lang: Language.English, full: 'true' },
+        };
+
+        await expect(async () => getQuestionHandler(req as Request, res as Response)).rejects.toThrow(BadRequestException);
+    });
+
+    /*
+    It('Create and delete question', async() => {
+        req = {
+            params: { hruid: 'id05', version: '1', seq: '2'},
+            query: { lang: Language.English },
+        };
+
+        await deleteQuestionHandler(req as Request, res as Response);
+
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ question: expect.anything() }));
+
+        const result = jsonMock.mock.lastCall?.[0];
+        console.log(result.question);
+    });
+
+     */
+
+    it('Update question', async () => {
+        const newContent = 'updated question';
+        req = {
+            params: { hruid: 'id05', version: '1', seq: '1' },
+            query: { lang: Language.English },
+            body: { content: newContent },
+        };
+
+        await updateQuestionHandler(req as Request, res as Response);
+
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ question: expect.anything() }));
+
+        const result = jsonMock.mock.lastCall?.[0];
+        // Console.log(result.question);
+        expect(result.question.content).to.eq(newContent);
+    });
+});

backend/tests/controllers/students.test.ts

@@ -186,7 +186,7 @@ describe('Student controllers', () => {
 
     it('Get join request by student and class', async () => {
         req = {
-            params: { username: 'PinkFloyd', classId: 'id02' },
+            params: { username: 'PinkFloyd', classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89' },
         };
 
         await getStudentRequestHandler(req as Request, res as Response);
@@ -198,29 +198,18 @@ describe('Student controllers', () => {
         );
     });
 
-    it('Create join request', async () => {
+    it('Create and delete join request', async () => {
         req = {
-            params: { username: 'Noordkaap' },
-            body: { classId: 'id02' },
+            params: { username: 'TheDoors' },
+            body: { classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89' },
         };
 
         await createStudentRequestHandler(req as Request, res as Response);
 
         expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ request: expect.anything() }));
-    });
 
-    it('Create join request duplicate', async () => {
         req = {
-            params: { username: 'Tool' },
-            body: { classId: 'id02' },
-        };
-
-        await expect(async () => createStudentRequestHandler(req as Request, res as Response)).rejects.toThrow(ConflictException);
-    });
-
-    it('Delete join request', async () => {
-        req = {
-            params: { username: 'Noordkaap', classId: 'id02' },
+            params: { username: 'TheDoors', classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89' },
         };
 
         await deleteClassJoinRequestHandler(req as Request, res as Response);
@@ -229,4 +218,22 @@ describe('Student controllers', () => {
 
         await expect(async () => deleteClassJoinRequestHandler(req as Request, res as Response)).rejects.toThrow(NotFoundException);
     });
+
+    it('Create join request student already in class error', async () => {
+        req = {
+            params: { username: 'Noordkaap' },
+            body: { classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89' },
+        };
+
+        await expect(async () => createStudentRequestHandler(req as Request, res as Response)).rejects.toThrow(ConflictException);
+    });
+
+    it('Create join request duplicate', async () => {
+        req = {
+            params: { username: 'Tool' },
+            body: { classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89' },
+        };
+
+        await expect(async () => createStudentRequestHandler(req as Request, res as Response)).rejects.toThrow(ConflictException);
+    });
 });

backend/tests/controllers/teacher-invitations.test.ts

@@ -0,0 +1,123 @@
+import { beforeAll, beforeEach, describe, expect, it, Mock, vi } from 'vitest';
+import { Request, Response } from 'express';
+import { setupTestApp } from '../setup-tests.js';
+import {
+    createInvitationHandler,
+    deleteInvitationHandler,
+    getAllInvitationsHandler,
+    getInvitationHandler,
+    updateInvitationHandler,
+} from '../../src/controllers/teacher-invitations';
+import { TeacherInvitationData } from '@dwengo-1/common/interfaces/teacher-invitation';
+import { getClassHandler } from '../../src/controllers/classes';
+import { BadRequestException } from '../../src/exceptions/bad-request-exception';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
+
+describe('Teacher controllers', () => {
+    let req: Partial<Request>;
+    let res: Partial<Response>;
+
+    let jsonMock: Mock;
+
+    beforeAll(async () => {
+        await setupTestApp();
+    });
+
+    beforeEach(() => {
+        jsonMock = vi.fn();
+        res = {
+            json: jsonMock,
+        };
+    });
+
+    it('Get teacher invitations by', async () => {
+        req = { params: { username: 'LimpBizkit' }, query: { sent: 'true' } };
+
+        await getAllInvitationsHandler(req as Request, res as Response);
+
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ invitations: expect.anything() }));
+
+        const result = jsonMock.mock.lastCall?.[0];
+        // Console.log(result.invitations);
+        expect(result.invitations).to.have.length.greaterThan(0);
+    });
+
+    it('Get teacher invitations for', async () => {
+        req = { params: { username: 'FooFighters' }, query: { by: 'false' } };
+
+        await getAllInvitationsHandler(req as Request, res as Response);
+
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ invitations: expect.anything() }));
+
+        const result = jsonMock.mock.lastCall?.[0];
+        expect(result.invitations).to.have.length.greaterThan(0);
+    });
+
+    it('Create and delete invitation', async () => {
+        const body = {
+            sender: 'LimpBizkit',
+            receiver: 'testleerkracht1',
+            class: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89',
+        } as TeacherInvitationData;
+        req = { body };
+
+        await createInvitationHandler(req as Request, res as Response);
+
+        req = {
+            params: {
+                sender: 'LimpBizkit',
+                receiver: 'testleerkracht1',
+                classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89',
+            },
+            body: { accepted: 'false' },
+        };
+
+        await deleteInvitationHandler(req as Request, res as Response);
+    });
+
+    it('Get invitation', async () => {
+        req = {
+            params: {
+                sender: 'LimpBizkit',
+                receiver: 'FooFighters',
+                classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89',
+            },
+        };
+        await getInvitationHandler(req as Request, res as Response);
+
+        expect(jsonMock).toHaveBeenCalledWith(expect.objectContaining({ invitation: expect.anything() }));
+    });
+
+    it('Get invitation error', async () => {
+        req = {
+            params: { no: 'no params' },
+        };
+
+        await expect(async () => getInvitationHandler(req as Request, res as Response)).rejects.toThrowError(BadRequestException);
+    });
+
+    it('Accept invitation', async () => {
+        const body = {
+            sender: 'LimpBizkit',
+            receiver: 'FooFighters',
+            class: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89',
+        } as TeacherInvitationData;
+        req = { body };
+
+        await updateInvitationHandler(req as Request, res as Response);
+
+        const result1 = jsonMock.mock.lastCall?.[0];
+        expect(result1.invitation.status).toEqual(ClassStatus.Accepted);
+
+        req = {
+            params: {
+                id: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89',
+            },
+        };
+
+        await getClassHandler(req as Request, res as Response);
+
+        const result = jsonMock.mock.lastCall?.[0];
+        expect(result.class.teachers).toContain('FooFighters');
+    });
+});

backend/tests/controllers/teachers.test.ts

@@ -16,6 +16,7 @@ import { BadRequestException } from '../../src/exceptions/bad-request-exception.
 import { EntityAlreadyExistsException } from '../../src/exceptions/entity-already-exists-exception.js';
 import { getStudentRequestsHandler } from '../../src/controllers/students.js';
 import { TeacherDTO } from '@dwengo-1/common/interfaces/teacher';
+import { getClassHandler } from '../../src/controllers/classes';
 
 describe('Teacher controllers', () => {
     let req: Partial<Request>;
@@ -104,9 +105,9 @@ describe('Teacher controllers', () => {
         const result = jsonMock.mock.lastCall?.[0];
 
         const teacherUsernames = result.teachers.map((s: TeacherDTO) => s.username);
-        expect(teacherUsernames).toContain('FooFighters');
+        expect(teacherUsernames).toContain('testleerkracht1');
 
-        expect(result.teachers).toHaveLength(4);
+        expect(result.teachers).toHaveLength(5);
     });
 
     it('Deleting non-existent student', async () => {
@@ -117,7 +118,7 @@ describe('Teacher controllers', () => {
 
     it('Get teacher classes', async () => {
         req = {
-            params: { username: 'FooFighters' },
+            params: { username: 'testleerkracht1' },
             query: { full: 'true' },
         };
 
@@ -132,7 +133,7 @@ describe('Teacher controllers', () => {
 
     it('Get teacher students', async () => {
         req = {
-            params: { username: 'FooFighters' },
+            params: { username: 'testleerkracht1' },
             query: { full: 'true' },
         };
 
@@ -168,8 +169,7 @@ describe('Teacher controllers', () => {
 
     it('Get join requests by class', async () => {
         req = {
-            query: { username: 'LimpBizkit' },
-            params: { classId: 'id02' },
+            params: { classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89' },
         };
 
         await getStudentJoinRequestHandler(req as Request, res as Response);
@@ -183,8 +183,7 @@ describe('Teacher controllers', () => {
 
     it('Update join request status', async () => {
         req = {
-            query: { username: 'LimpBizkit', studentUsername: 'PinkFloyd' },
-            params: { classId: 'id02' },
+            params: { classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89', studentUsername: 'PinkFloyd' },
             body: { accepted: 'true' },
         };
 
@@ -200,5 +199,13 @@ describe('Teacher controllers', () => {
 
         const status: boolean = jsonMock.mock.lastCall?.[0].requests[0].status;
         expect(status).toBeTruthy();
+
+        req = {
+            params: { id: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89' },
+        };
+
+        await getClassHandler(req as Request, res as Response);
+        const students: string[] = jsonMock.mock.lastCall?.[0].class.students;
+        expect(students).contains('PinkFloyd');
     });
 });

backend/tests/data/assignments/assignments.test.ts

@@ -15,7 +15,7 @@ describe('AssignmentRepository', () => {
     });
 
     it('should return the requested assignment', async () => {
-        const class_ = await classRepository.findById('id02');
+        const class_ = await classRepository.findById('34d484a1-295f-4e9f-bfdc-3e7a23d86a89');
         const assignment = await assignmentRepository.findByClassAndId(class_!, 2);
 
         expect(assignment).toBeTruthy();
@@ -23,7 +23,7 @@ describe('AssignmentRepository', () => {
     });
 
     it('should return all assignments for a class', async () => {
-        const class_ = await classRepository.findById('id02');
+        const class_ = await classRepository.findById('34d484a1-295f-4e9f-bfdc-3e7a23d86a89');
         const assignments = await assignmentRepository.findAllAssignmentsInClass(class_!);
 
         expect(assignments).toBeTruthy();
@@ -31,6 +31,13 @@ describe('AssignmentRepository', () => {
         expect(assignments[0].title).toBe('tool');
     });
 
+    it('should find all by username of the responsible teacher', async () => {
+        const result = await assignmentRepository.findAllByResponsibleTeacher('testleerkracht1');
+        const resultIds = result.map((it) => it.id).sort((a, b) => (a ?? 0) - (b ?? 0));
+
+        expect(resultIds).toEqual([1, 3, 4]);
+    });
+
     it('should not find removed assignment', async () => {
         const class_ = await classRepository.findById('id01');
         await assignmentRepository.deleteByClassAndId(class_!, 3);

backend/tests/data/assignments/groups.test.ts

@@ -18,7 +18,7 @@ describe('GroupRepository', () => {
     });
 
     it('should return the requested group', async () => {
-        const class_ = await classRepository.findById('id01');
+        const class_ = await classRepository.findById('8764b861-90a6-42e5-9732-c0d9eb2f55f9');
         const assignment = await assignmentRepository.findByClassAndId(class_!, 1);
 
         const group = await groupRepository.findByAssignmentAndGroupNumber(assignment!, 1);
@@ -27,7 +27,7 @@ describe('GroupRepository', () => {
     });
 
     it('should return all groups for assignment', async () => {
-        const class_ = await classRepository.findById('id01');
+        const class_ = await classRepository.findById('8764b861-90a6-42e5-9732-c0d9eb2f55f9');
         const assignment = await assignmentRepository.findByClassAndId(class_!, 1);
 
         const groups = await groupRepository.findAllGroupsForAssignment(assignment!);
@@ -37,7 +37,7 @@ describe('GroupRepository', () => {
     });
 
     it('should not find removed group', async () => {
-        const class_ = await classRepository.findById('id02');
+        const class_ = await classRepository.findById('34d484a1-295f-4e9f-bfdc-3e7a23d86a89');
         const assignment = await assignmentRepository.findByClassAndId(class_!, 2);
 
         await groupRepository.deleteByAssignmentAndGroupNumber(assignment!, 1);

backend/tests/data/assignments/submissions.test.ts

@@ -14,6 +14,9 @@ import { StudentRepository } from '../../../src/data/users/student-repository';
 import { GroupRepository } from '../../../src/data/assignments/group-repository';
 import { AssignmentRepository } from '../../../src/data/assignments/assignment-repository';
 import { ClassRepository } from '../../../src/data/classes/class-repository';
+import { Submission } from '../../../src/entities/assignments/submission.entity';
+import { Class } from '../../../src/entities/classes/class.entity';
+import { Assignment } from '../../../src/entities/assignments/assignment.entity';
 
 describe('SubmissionRepository', () => {
     let submissionRepository: SubmissionRepository;
@@ -50,7 +53,7 @@ describe('SubmissionRepository', () => {
 
     it('should find the most recent submission for a group', async () => {
         const id = new LearningObjectIdentifier('id03', Language.English, 1);
-        const class_ = await classRepository.findById('id01');
+        const class_ = await classRepository.findById('8764b861-90a6-42e5-9732-c0d9eb2f55f9');
         const assignment = await assignmentRepository.findByClassAndId(class_!, 1);
         const group = await groupRepository.findByAssignmentAndGroupNumber(assignment!, 1);
         const submission = await submissionRepository.findMostRecentSubmissionForGroup(id, group!);
@@ -59,6 +62,49 @@ describe('SubmissionRepository', () => {
         expect(submission?.submissionTime.getDate()).toBe(25);
     });
 
+    let clazz: Class | null;
+    let assignment: Assignment | null;
+    let loId: LearningObjectIdentifier;
+    it('should find all submissions for a certain learning object and assignment', async () => {
+        clazz = await classRepository.findById('8764b861-90a6-42e5-9732-c0d9eb2f55f9');
+        assignment = await assignmentRepository.findByClassAndId(clazz!, 1);
+        loId = {
+            hruid: 'id02',
+            language: Language.English,
+            version: 1,
+        };
+        const result = await submissionRepository.findAllSubmissionsForLearningObjectAndAssignment(loId, assignment!);
+        sortSubmissions(result);
+
+        expect(result).toHaveLength(3);
+
+        // Submission3 should be found (for learning object 'id02' by group #1 for Assignment #1 in class 'id01')
+        expect(result[0].learningObjectHruid).toBe(loId.hruid);
+        expect(result[0].submissionNumber).toBe(1);
+
+        // Submission4 should be found (for learning object 'id02' by group #1 for Assignment #1 in class 'id01')
+        expect(result[1].learningObjectHruid).toBe(loId.hruid);
+        expect(result[1].submissionNumber).toBe(2);
+
+        // Submission8 should be found (for learning object 'id02' by group #2 for Assignment #1 in class 'id01')
+        expect(result[2].learningObjectHruid).toBe(loId.hruid);
+        expect(result[2].submissionNumber).toBe(3);
+    });
+
+    it("should find only the submissions for a certain learning object and assignment made for the user's group", async () => {
+        const result = await submissionRepository.findAllSubmissionsForLearningObjectAndAssignment(loId, assignment!, 'Tool');
+        // (student Tool is in group #2)
+
+        expect(result).toHaveLength(1);
+
+        // Submission8 should be found (for learning object 'id02' by group #2 for Assignment #1 in class 'id01')
+        expect(result[0].learningObjectHruid).toBe(loId.hruid);
+        expect(result[0].submissionNumber).toBe(3);
+
+        // The other submissions found in the previous test case should not be found anymore as they were made on
+        // Behalf of group #1 which Tool is no member of.
+    });
+
     it('should not find a deleted submission', async () => {
         const id = new LearningObjectIdentifier('id01', Language.English, 1);
         await submissionRepository.deleteSubmissionByLearningObjectAndSubmissionNumber(id, 1);
@@ -68,3 +114,15 @@ describe('SubmissionRepository', () => {
         expect(submission).toBeNull();
     });
 });
+
+function sortSubmissions(submissions: Submission[]): void {
+    submissions.sort((a, b) => {
+        if (a.learningObjectHruid < b.learningObjectHruid) {
+            return -1;
+        }
+        if (a.learningObjectHruid > b.learningObjectHruid) {
+            return 1;
+        }
+        return a.submissionNumber! - b.submissionNumber!;
+    });
+}

backend/tests/data/classes/class-join-request.test.ts

@@ -26,7 +26,7 @@ describe('ClassJoinRequestRepository', () => {
     });
 
     it('should list all requests to a single class', async () => {
-        const class_ = await cassRepository.findById('id02');
+        const class_ = await cassRepository.findById('34d484a1-295f-4e9f-bfdc-3e7a23d86a89');
         const requests = await classJoinRequestRepository.findAllOpenRequestsTo(class_!);
 
         expect(requests).toBeTruthy();
@@ -35,7 +35,7 @@ describe('ClassJoinRequestRepository', () => {
 
     it('should not find a removed request', async () => {
         const student = await studentRepository.findByUsername('SmashingPumpkins');
-        const class_ = await cassRepository.findById('id03');
+        const class_ = await cassRepository.findById('80dcc3e0-1811-4091-9361-42c0eee91cfa');
         await classJoinRequestRepository.deleteBy(student!, class_!);
 
         const request = await classJoinRequestRepository.findAllRequestsBy(student!);

backend/tests/data/classes/classes.test.ts

@@ -18,16 +18,16 @@ describe('ClassRepository', () => {
     });
 
     it('should return requested class', async () => {
-        const classVar = await classRepository.findById('id01');
+        const classVar = await classRepository.findById('8764b861-90a6-42e5-9732-c0d9eb2f55f9');
 
         expect(classVar).toBeTruthy();
         expect(classVar?.displayName).toBe('class01');
     });
 
     it('class should be gone after deletion', async () => {
-        await classRepository.deleteById('id04');
+        await classRepository.deleteById('33d03536-83b8-4880-9982-9bbf2f908ddf');
 
-        const classVar = await classRepository.findById('id04');
+        const classVar = await classRepository.findById('33d03536-83b8-4880-9982-9bbf2f908ddf');
 
         expect(classVar).toBeNull();
     });

backend/tests/data/classes/teacher-invitation.test.ts

@@ -34,7 +34,7 @@ describe('ClassRepository', () => {
     });
 
     it('should return all invitations for a class', async () => {
-        const class_ = await classRepository.findById('id02');
+        const class_ = await classRepository.findById('34d484a1-295f-4e9f-bfdc-3e7a23d86a89');
         const invitations = await teacherInvitationRepository.findAllInvitationsForClass(class_!);
 
         expect(invitations).toBeTruthy();
@@ -42,7 +42,7 @@ describe('ClassRepository', () => {
     });
 
     it('should not find a removed invitation', async () => {
-        const class_ = await classRepository.findById('id01');
+        const class_ = await classRepository.findById('8764b861-90a6-42e5-9732-c0d9eb2f55f9');
         const sender = await teacherRepository.findByUsername('FooFighters');
         const receiver = await teacherRepository.findByUsername('LimpBizkit');
         await teacherInvitationRepository.deleteBy(class_!, sender!, receiver!);

backend/tests/data/questions/questions.test.ts

@@ -1,10 +1,19 @@
 import { beforeAll, describe, expect, it } from 'vitest';
 import { setupTestApp } from '../../setup-tests';
 import { QuestionRepository } from '../../../src/data/questions/question-repository';
-import { getQuestionRepository, getStudentRepository } from '../../../src/data/repositories';
+import {
+    getAssignmentRepository,
+    getClassRepository,
+    getGroupRepository,
+    getQuestionRepository,
+    getStudentRepository,
+} from '../../../src/data/repositories';
 import { StudentRepository } from '../../../src/data/users/student-repository';
 import { LearningObjectIdentifier } from '../../../src/entities/content/learning-object-identifier';
 import { Language } from '@dwengo-1/common/util/language';
+import { Question } from '../../../src/entities/questions/question.entity';
+import { Class } from '../../../src/entities/classes/class.entity';
+import { Assignment } from '../../../src/entities/assignments/assignment.entity';
 
 describe('QuestionRepository', () => {
     let questionRepository: QuestionRepository;
@@ -21,14 +30,19 @@ describe('QuestionRepository', () => {
         const questions = await questionRepository.findAllQuestionsAboutLearningObject(id);
 
         expect(questions).toBeTruthy();
-        expect(questions).toHaveLength(2);
+        expect(questions).toHaveLength(4);
     });
 
     it('should create new question', async () => {
         const id = new LearningObjectIdentifier('id03', Language.English, 1);
         const student = await studentRepository.findByUsername('Noordkaap');
+
+        const clazz = await getClassRepository().findById('8764b861-90a6-42e5-9732-c0d9eb2f55f9');
+        const assignment = await getAssignmentRepository().findByClassAndId(clazz!, 1);
+        const group = await getGroupRepository().findByAssignmentAndGroupNumber(assignment!, 1);
         await questionRepository.createQuestion({
             loId: id,
+            inGroup: group!,
             author: student!,
             content: 'question?',
         });
@@ -38,6 +52,52 @@ describe('QuestionRepository', () => {
         expect(question).toHaveLength(1);
     });
 
+    let clazz: Class | null;
+    let assignment: Assignment | null;
+    let loId: LearningObjectIdentifier;
+    it('should find all questions for a certain learning object and assignment', async () => {
+        clazz = await getClassRepository().findById('8764b861-90a6-42e5-9732-c0d9eb2f55f9');
+        assignment = await getAssignmentRepository().findByClassAndId(clazz!, 1);
+        loId = {
+            hruid: 'id05',
+            language: Language.English,
+            version: 1,
+        };
+        const result = await questionRepository.findAllQuestionsAboutLearningObjectInAssignment(loId, assignment!);
+        sortQuestions(result);
+
+        expect(result).toHaveLength(3);
+
+        // Question01: About learning object 'id05', in group #1 for Assignment #1 in class 'id01'
+        expect(result[0].learningObjectHruid).toEqual(loId.hruid);
+        expect(result[0].sequenceNumber).toEqual(1);
+
+        // Question02: About learning object 'id05', in group #1 for Assignment #1 in class 'id01'
+        expect(result[1].learningObjectHruid).toEqual(loId.hruid);
+        expect(result[1].sequenceNumber).toEqual(2);
+
+        // Question05: About learning object 'id05', in group #2 for Assignment #1 in class 'id01'
+        expect(result[2].learningObjectHruid).toEqual(loId.hruid);
+        expect(result[2].sequenceNumber).toEqual(3);
+
+        // Question06: About learning object 'id05', but for Assignment #2 in class 'id01' => not expected.
+    });
+
+    it("should find only the questions for a certain learning object and assignment asked by the user's group", async () => {
+        const result = await questionRepository.findAllQuestionsAboutLearningObjectInAssignment(loId, assignment!, 'Tool');
+        // (student Tool is in group #2)
+
+        expect(result).toHaveLength(1);
+
+        // Question01 and question02 are in group #1 => not displayed.
+
+        // Question05: About learning object 'id05', in group #2 for Assignment #1 in class 'id01'
+        expect(result[0].learningObjectHruid).toEqual(loId.hruid);
+        expect(result[0].sequenceNumber).toEqual(3);
+
+        // Question06: About learning object 'id05', but for Assignment #2 in class 'id01' => not expected.
+    });
+
     it('should not find removed question', async () => {
         const id = new LearningObjectIdentifier('id04', Language.English, 1);
         await questionRepository.removeQuestionByLearningObjectAndSequenceNumber(id, 1);
@@ -47,3 +107,14 @@ describe('QuestionRepository', () => {
         expect(question).toHaveLength(0);
     });
 });
+
+function sortQuestions(questions: Question[]): void {
+    questions.sort((a, b) => {
+        if (a.learningObjectHruid < b.learningObjectHruid) {
+            return -1;
+        } else if (a.learningObjectHruid > b.learningObjectHruid) {
+            return 1;
+        }
+        return a.sequenceNumber! - b.sequenceNumber!;
+    });
+}

backend/tests/services/learning-objects/learning-object-service.test.ts

@@ -7,11 +7,11 @@ import learningObjectService from '../../../src/services/learning-objects/learni
 import { envVars, getEnvVar } from '../../../src/util/envVars';
 import { LearningPath } from '../../../src/entities/content/learning-path.entity';
 import learningPathExample from '../../test-assets/learning-paths/pn-werking-example';
-import { LearningObjectIdentifier, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
+import { LearningObjectIdentifierDTO, LearningPathIdentifier } from '@dwengo-1/common/interfaces/learning-content';
 import { Language } from '@dwengo-1/common/util/language';
 
 const EXPECTED_DWENGO_LEARNING_OBJECT_TITLE = 'Werken met notebooks';
-const DWENGO_TEST_LEARNING_OBJECT_ID: LearningObjectIdentifier = {
+const DWENGO_TEST_LEARNING_OBJECT_ID: LearningObjectIdentifierDTO = {
     hruid: 'pn_werkingnotebooks',
     language: Language.Dutch,
     version: 3,

backend/tests/services/learning-path/database-learning-path-provider.test.ts

@@ -3,6 +3,9 @@ import { LearningObject } from '../../../src/entities/content/learning-object.en
 import { setupTestApp } from '../../setup-tests.js';
 import { LearningPath } from '../../../src/entities/content/learning-path.entity.js';
 import {
+    getAssignmentRepository,
+    getClassRepository,
+    getGroupRepository,
     getLearningObjectRepository,
     getLearningPathRepository,
     getStudentRepository,
@@ -22,6 +25,10 @@ import { Student } from '../../../src/entities/users/student.entity.js';
 
 import { LearningObjectNode, LearningPathResponse } from '@dwengo-1/common/interfaces/learning-content';
 
+const STUDENT_A_USERNAME = 'student_a';
+const STUDENT_B_USERNAME = 'student_b';
+const CLASS_NAME = 'test_class';
+
 async function initExampleData(): Promise<{ learningObject: LearningObject; learningPath: LearningPath }> {
     const learningObjectRepo = getLearningObjectRepository();
     const learningPathRepo = getLearningPathRepository();
@@ -38,6 +45,9 @@ async function initPersonalizationTestData(): Promise<{
     studentB: Student;
 }> {
     const studentRepo = getStudentRepository();
+    const classRepo = getClassRepository();
+    const assignmentRepo = getAssignmentRepository();
+    const groupRepo = getGroupRepository();
     const submissionRepo = getSubmissionRepository();
     const learningPathRepo = getLearningPathRepository();
     const learningObjectRepo = getLearningObjectRepository();
@@ -47,32 +57,69 @@ async function initPersonalizationTestData(): Promise<{
     await learningObjectRepo.save(learningContent.extraExerciseObject);
     await learningPathRepo.save(learningContent.learningPath);
 
+    // Create students
     const studentA = studentRepo.create({
-        username: 'student_a',
+        username: STUDENT_A_USERNAME,
         firstName: 'Aron',
         lastName: 'Student',
     });
     await studentRepo.save(studentA);
+
+    const studentB = studentRepo.create({
+        username: STUDENT_B_USERNAME,
+        firstName: 'Bill',
+        lastName: 'Student',
+    });
+    await studentRepo.save(studentB);
+
+    // Create class for students
+    const testClass = classRepo.create({
+        classId: CLASS_NAME,
+        displayName: 'Test class',
+    });
+    await classRepo.save(testClass);
+
+    // Create assignment for students and assign them to different groups
+    const assignment = assignmentRepo.create({
+        id: 0,
+        title: 'Test assignment',
+        description: 'Test description',
+        learningPathHruid: learningContent.learningPath.hruid,
+        learningPathLanguage: learningContent.learningPath.language,
+        within: testClass,
+    });
+
+    const groupA = groupRepo.create({
+        groupNumber: 0,
+        members: [studentA],
+        assignment,
+    });
+    await groupRepo.save(groupA);
+
+    const groupB = groupRepo.create({
+        groupNumber: 1,
+        members: [studentB],
+        assignment,
+    });
+    await groupRepo.save(groupB);
+
+    // Let each of the students make a submission in his own group.
     const submissionA = submissionRepo.create({
         learningObjectHruid: learningContent.branchingObject.hruid,
         learningObjectLanguage: learningContent.branchingObject.language,
         learningObjectVersion: learningContent.branchingObject.version,
+        onBehalfOf: groupA,
         submitter: studentA,
         submissionTime: new Date(),
         content: '[0]',
     });
     await submissionRepo.save(submissionA);
 
-    const studentB = studentRepo.create({
-        username: 'student_b',
-        firstName: 'Bill',
-        lastName: 'Student',
-    });
-    await studentRepo.save(studentB);
     const submissionB = submissionRepo.create({
         learningObjectHruid: learningContent.branchingObject.hruid,
         learningObjectLanguage: learningContent.branchingObject.language,
         learningObjectVersion: learningContent.branchingObject.version,
+        onBehalfOf: groupA,
         submitter: studentB,
         submissionTime: new Date(),
         content: '[1]',

backend/tests/setup-tests.ts

@@ -13,6 +13,7 @@ import { makeTestAttachments } from './test_assets/content/attachments.testdata.
 import { makeTestQuestions } from './test_assets/questions/questions.testdata.js';
 import { makeTestAnswers } from './test_assets/questions/answers.testdata.js';
 import { makeTestSubmissions } from './test_assets/assignments/submission.testdata.js';
+import { Collection } from '@mikro-orm/core';
 
 export async function setupTestApp(): Promise<void> {
     dotenv.config({ path: '.env.test' });
@@ -28,8 +29,8 @@ export async function setupTestApp(): Promise<void> {
     const assignments = makeTestAssignemnts(em, classes);
     const groups = makeTestGroups(em, students, assignments);
 
-    assignments[0].groups = groups.slice(0, 3);
-    assignments[1].groups = groups.slice(3, 4);
+    assignments[0].groups = new Collection(groups.slice(0, 3));
+    assignments[1].groups = new Collection(groups.slice(3, 4));
 
     const teacherInvitations = makeTestTeacherInvitations(em, teachers, classes);
     const classJoinRequests = makeTestClassJoinRequests(em, students, classes);
@@ -37,7 +38,7 @@ export async function setupTestApp(): Promise<void> {
 
     learningObjects[1].attachments = attachments;
 
-    const questions = makeTestQuestions(em, students);
+    const questions = makeTestQuestions(em, students, groups);
     const answers = makeTestAnswers(em, teachers, questions);
     const submissions = makeTestSubmissions(em, students, groups);
 

backend/tests/test_assets/assignments/assignments.testdata.ts

@@ -34,5 +34,15 @@ export function makeTestAssignemnts(em: EntityManager, classes: Class[]): Assign
         groups: [],
     });
 
-    return [assignment01, assignment02, assignment03];
+    const assignment04 = em.create(Assignment, {
+        within: classes[0],
+        id: 4,
+        title: 'another assignment',
+        description: 'with a description',
+        learningPathHruid: 'id01',
+        learningPathLanguage: Language.English,
+        groups: [],
+    });
+
+    return [assignment01, assignment02, assignment03, assignment04];
 }

backend/tests/test_assets/assignments/groups.testdata.ts

@@ -4,29 +4,55 @@ import { Assignment } from '../../../src/entities/assignments/assignment.entity'
 import { Student } from '../../../src/entities/users/student.entity';
 
 export function makeTestGroups(em: EntityManager, students: Student[], assignments: Assignment[]): Group[] {
+    /*
+     * Group #1 for Assignment #1 in class 'id01'
+     * => Assigned to do learning path 'id02'
+     */
     const group01 = em.create(Group, {
         assignment: assignments[0],
         groupNumber: 1,
         members: students.slice(0, 2),
     });
 
+    /*
+     * Group #2 for Assignment #1 in class 'id01'
+     * => Assigned to do learning path 'id02'
+     */
     const group02 = em.create(Group, {
         assignment: assignments[0],
         groupNumber: 2,
         members: students.slice(2, 4),
     });
 
+    /*
+     * Group #3 for Assignment #1 in class 'id01'
+     * => Assigned to do learning path 'id02'
+     */
     const group03 = em.create(Group, {
         assignment: assignments[0],
         groupNumber: 3,
         members: students.slice(4, 6),
     });
 
+    /*
+     * Group #4 for Assignment #2 in class 'id02'
+     * => Assigned to do learning path 'id01'
+     */
     const group04 = em.create(Group, {
         assignment: assignments[1],
         groupNumber: 4,
         members: students.slice(3, 4),
     });
 
-    return [group01, group02, group03, group04];
+    /*
+     * Group #5 for Assignment #4 in class 'id01'
+     * => Assigned to do learning path 'id01'
+     */
+    const group05 = em.create(Group, {
+        assignment: assignments[3],
+        groupNumber: 1,
+        members: students.slice(0, 2),
+    });
+
+    return [group01, group02, group03, group04, group05];
 }

backend/tests/test_assets/assignments/submission.testdata.ts

@@ -12,7 +12,7 @@ export function makeTestSubmissions(em: EntityManager, students: Student[], grou
         submissionNumber: 1,
         submitter: students[0],
         submissionTime: new Date(2025, 2, 20),
-        onBehalfOf: groups[0],
+        onBehalfOf: groups[0], // Group #1 for Assignment #1 in class 'id01'
         content: 'sub1',
     });
 
@@ -23,7 +23,7 @@ export function makeTestSubmissions(em: EntityManager, students: Student[], grou
         submissionNumber: 2,
         submitter: students[0],
         submissionTime: new Date(2025, 2, 25),
-        onBehalfOf: groups[0],
+        onBehalfOf: groups[0], // Group #1 for Assignment #1 in class 'id01'
         content: '',
     });
 
@@ -34,6 +34,7 @@ export function makeTestSubmissions(em: EntityManager, students: Student[], grou
         submissionNumber: 1,
         submitter: students[0],
         submissionTime: new Date(2025, 2, 20),
+        onBehalfOf: groups[0], // Group #1 for Assignment #1 in class 'id01'
         content: '',
     });
 
@@ -44,6 +45,7 @@ export function makeTestSubmissions(em: EntityManager, students: Student[], grou
         submissionNumber: 2,
         submitter: students[0],
         submissionTime: new Date(2025, 2, 25),
+        onBehalfOf: groups[0], // Group #1 for Assignment #1 in class 'id01'
         content: '',
     });
 
@@ -54,8 +56,42 @@ export function makeTestSubmissions(em: EntityManager, students: Student[], grou
         submissionNumber: 1,
         submitter: students[1],
         submissionTime: new Date(2025, 2, 20),
+        onBehalfOf: groups[1], // Group #2 for Assignment #1 in class 'id01'
         content: '',
     });
 
-    return [submission01, submission02, submission03, submission04, submission05];
+    const submission06 = em.create(Submission, {
+        learningObjectHruid: 'id01',
+        learningObjectLanguage: Language.English,
+        learningObjectVersion: 1,
+        submissionNumber: 2,
+        submitter: students[1],
+        submissionTime: new Date(2025, 2, 25),
+        onBehalfOf: groups[4], // Group #5 for Assignment #4 in class 'id01'
+        content: '',
+    });
+
+    const submission07 = em.create(Submission, {
+        learningObjectHruid: 'id01',
+        learningObjectLanguage: Language.English,
+        learningObjectVersion: 1,
+        submissionNumber: 3,
+        submitter: students[3],
+        submissionTime: new Date(2025, 3, 25),
+        onBehalfOf: groups[3], // Group #4 for Assignment #2 in class 'id02'
+        content: '',
+    });
+
+    const submission08 = em.create(Submission, {
+        learningObjectHruid: 'id02',
+        learningObjectLanguage: Language.English,
+        learningObjectVersion: 1,
+        submissionNumber: 3,
+        submitter: students[1],
+        submissionTime: new Date(2025, 4, 7),
+        onBehalfOf: groups[1], // Group #2 for Assignment #1 in class 'id01'
+        content: '',
+    });
+
+    return [submission01, submission02, submission03, submission04, submission05, submission06, submission07, submission08];
 }

backend/tests/test_assets/classes/class-join-requests.testdata.ts

@@ -2,31 +2,31 @@ import { EntityManager } from '@mikro-orm/core';
 import { ClassJoinRequest } from '../../../src/entities/classes/class-join-request.entity';
 import { Student } from '../../../src/entities/users/student.entity';
 import { Class } from '../../../src/entities/classes/class.entity';
-import { ClassJoinRequestStatus } from '@dwengo-1/common/util/class-join-request';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export function makeTestClassJoinRequests(em: EntityManager, students: Student[], classes: Class[]): ClassJoinRequest[] {
     const classJoinRequest01 = em.create(ClassJoinRequest, {
         requester: students[4],
         class: classes[1],
-        status: ClassJoinRequestStatus.Open,
+        status: ClassStatus.Open,
     });
 
     const classJoinRequest02 = em.create(ClassJoinRequest, {
         requester: students[2],
         class: classes[1],
-        status: ClassJoinRequestStatus.Open,
+        status: ClassStatus.Open,
     });
 
     const classJoinRequest03 = em.create(ClassJoinRequest, {
         requester: students[4],
         class: classes[2],
-        status: ClassJoinRequestStatus.Open,
+        status: ClassStatus.Open,
     });
 
     const classJoinRequest04 = em.create(ClassJoinRequest, {
         requester: students[3],
         class: classes[2],
-        status: ClassJoinRequestStatus.Open,
+        status: ClassStatus.Open,
     });
 
     return [classJoinRequest01, classJoinRequest02, classJoinRequest03, classJoinRequest04];

backend/tests/test_assets/classes/classes.testdata.ts

@@ -4,11 +4,11 @@ import { Student } from '../../../src/entities/users/student.entity';
 import { Teacher } from '../../../src/entities/users/teacher.entity';
 
 export function makeTestClasses(em: EntityManager, students: Student[], teachers: Teacher[]): Class[] {
-    const studentsClass01 = students.slice(0, 7);
-    const teacherClass01: Teacher[] = teachers.slice(0, 1);
+    const studentsClass01 = students.slice(0, 8);
+    const teacherClass01: Teacher[] = teachers.slice(4, 5);
 
     const class01 = em.create(Class, {
-        classId: 'id01',
+        classId: '8764b861-90a6-42e5-9732-c0d9eb2f55f9',
         displayName: 'class01',
         teachers: teacherClass01,
         students: studentsClass01,
@@ -18,7 +18,7 @@ export function makeTestClasses(em: EntityManager, students: Student[], teachers
     const teacherClass02: Teacher[] = teachers.slice(1, 2);
 
     const class02 = em.create(Class, {
-        classId: 'id02',
+        classId: '34d484a1-295f-4e9f-bfdc-3e7a23d86a89',
         displayName: 'class02',
         teachers: teacherClass02,
         students: studentsClass02,
@@ -28,7 +28,7 @@ export function makeTestClasses(em: EntityManager, students: Student[], teachers
     const teacherClass03: Teacher[] = teachers.slice(2, 3);
 
     const class03 = em.create(Class, {
-        classId: 'id03',
+        classId: '80dcc3e0-1811-4091-9361-42c0eee91cfa',
         displayName: 'class03',
         teachers: teacherClass03,
         students: studentsClass03,
@@ -38,7 +38,7 @@ export function makeTestClasses(em: EntityManager, students: Student[], teachers
     const teacherClass04: Teacher[] = teachers.slice(2, 3);
 
     const class04 = em.create(Class, {
-        classId: 'id04',
+        classId: '33d03536-83b8-4880-9982-9bbf2f908ddf',
         displayName: 'class04',
         teachers: teacherClass04,
         students: studentsClass04,

backend/tests/test_assets/classes/teacher-invitations.testdata.ts

@@ -2,30 +2,35 @@ import { EntityManager } from '@mikro-orm/core';
 import { TeacherInvitation } from '../../../src/entities/classes/teacher-invitation.entity';
 import { Teacher } from '../../../src/entities/users/teacher.entity';
 import { Class } from '../../../src/entities/classes/class.entity';
+import { ClassStatus } from '@dwengo-1/common/util/class-join-request';
 
 export function makeTestTeacherInvitations(em: EntityManager, teachers: Teacher[], classes: Class[]): TeacherInvitation[] {
     const teacherInvitation01 = em.create(TeacherInvitation, {
         sender: teachers[1],
         receiver: teachers[0],
         class: classes[1],
+        status: ClassStatus.Open,
     });
 
     const teacherInvitation02 = em.create(TeacherInvitation, {
         sender: teachers[1],
         receiver: teachers[2],
         class: classes[1],
+        status: ClassStatus.Open,
     });
 
     const teacherInvitation03 = em.create(TeacherInvitation, {
         sender: teachers[2],
         receiver: teachers[0],
         class: classes[2],
+        status: ClassStatus.Open,
     });
 
     const teacherInvitation04 = em.create(TeacherInvitation, {
         sender: teachers[0],
         receiver: teachers[1],
         class: classes[0],
+        status: ClassStatus.Open,
     });
 
     return [teacherInvitation01, teacherInvitation02, teacherInvitation03, teacherInvitation04];

backend/tests/test_assets/questions/questions.testdata.ts

@@ -2,12 +2,14 @@ import { EntityManager } from '@mikro-orm/core';
 import { Question } from '../../../src/entities/questions/question.entity';
 import { Language } from '@dwengo-1/common/util/language';
 import { Student } from '../../../src/entities/users/student.entity';
+import { Group } from '../../../src/entities/assignments/group.entity';
 
-export function makeTestQuestions(em: EntityManager, students: Student[]): Question[] {
+export function makeTestQuestions(em: EntityManager, students: Student[], groups: Group[]): Question[] {
     const question01 = em.create(Question, {
         learningObjectLanguage: Language.English,
         learningObjectVersion: 1,
         learningObjectHruid: 'id05',
+        inGroup: groups[0], // Group #1 for Assignment #1 in class 'id01'
         sequenceNumber: 1,
         author: students[0],
         timestamp: new Date(),
@@ -18,6 +20,7 @@ export function makeTestQuestions(em: EntityManager, students: Student[]): Quest
         learningObjectLanguage: Language.English,
         learningObjectVersion: 1,
         learningObjectHruid: 'id05',
+        inGroup: groups[0], // Group #1 for Assignment #1 in class 'id01'
         sequenceNumber: 2,
         author: students[2],
         timestamp: new Date(),
@@ -30,6 +33,7 @@ export function makeTestQuestions(em: EntityManager, students: Student[]): Quest
         learningObjectHruid: 'id04',
         sequenceNumber: 1,
         author: students[0],
+        inGroup: groups[0], // Group #1 for Assignment #1 in class 'id01'
         timestamp: new Date(),
         content: 'question',
     });
@@ -40,9 +44,32 @@ export function makeTestQuestions(em: EntityManager, students: Student[]): Quest
         learningObjectHruid: 'id01',
         sequenceNumber: 1,
         author: students[1],
+        inGroup: groups[1], // Group #2 for Assignment #1 in class 'id01'
         timestamp: new Date(),
         content: 'question',
     });
 
-    return [question01, question02, question03, question04];
+    const question05 = em.create(Question, {
+        learningObjectLanguage: Language.English,
+        learningObjectVersion: 1,
+        learningObjectHruid: 'id05',
+        sequenceNumber: 3,
+        author: students[1],
+        inGroup: groups[1], // Group #2 for Assignment #1 in class 'id01'
+        timestamp: new Date(),
+        content: 'question',
+    });
+
+    const question06 = em.create(Question, {
+        learningObjectLanguage: Language.English,
+        learningObjectVersion: 1,
+        learningObjectHruid: 'id05',
+        sequenceNumber: 4,
+        author: students[2],
+        inGroup: groups[3], // Group #4 for Assignment #2 in class 'id02'
+        timestamp: new Date(),
+        content: 'question',
+    });
+
+    return [question01, question02, question03, question04, question05, question06];
 }

backend/tests/test_assets/users/students.testdata.ts

@@ -11,6 +11,8 @@ export const TEST_STUDENTS = [
     { username: 'TheDoors', firstName: 'Jim', lastName: 'Morisson' },
     // ⚠️ Deze mag niet gebruikt worden in elke test!
     { username: 'Nirvana', firstName: 'Kurt', lastName: 'Cobain' },
+    // Makes sure when logged in as leerling1, there exists a corresponding user
+    { username: 'testleerling1', firstName: 'Gerald', lastName: 'Schmittinger' },
 ];
 
 // 🏗️ Functie die ORM entities maakt uit de data array

backend/tests/test_assets/users/teachers.testdata.ts

@@ -27,5 +27,12 @@ export function makeTestTeachers(em: EntityManager): Teacher[] {
         lastName: 'Cappelle',
     });
 
-    return [teacher01, teacher02, teacher03, teacher04];
+    // Makes sure when logged in as testleerkracht1, there exists a corresponding user
+    const teacher05 = em.create(Teacher, {
+        username: 'testleerkracht1',
+        firstName: 'Bob',
+        lastName: 'Dylan',
+    });
+
+    return [teacher01, teacher02, teacher03, teacher04, teacher05];
 }

backend/tool/seed.ts

@@ -0,0 +1,74 @@
+import { forkEntityManager, initORM } from '../src/orm.js';
+import dotenv from 'dotenv';
+import { makeTestAssignemnts } from '../tests/test_assets/assignments/assignments.testdata.js';
+import { makeTestGroups } from '../tests/test_assets/assignments/groups.testdata.js';
+import { makeTestSubmissions } from '../tests/test_assets/assignments/submission.testdata.js';
+import { makeTestClassJoinRequests } from '../tests/test_assets/classes/class-join-requests.testdata.js';
+import { makeTestClasses } from '../tests/test_assets/classes/classes.testdata.js';
+import { makeTestTeacherInvitations } from '../tests/test_assets/classes/teacher-invitations.testdata.js';
+import { makeTestAttachments } from '../tests/test_assets/content/attachments.testdata.js';
+import { makeTestLearningObjects } from '../tests/test_assets/content/learning-objects.testdata.js';
+import { makeTestLearningPaths } from '../tests/test_assets/content/learning-paths.testdata.js';
+import { makeTestAnswers } from '../tests/test_assets/questions/answers.testdata.js';
+import { makeTestQuestions } from '../tests/test_assets/questions/questions.testdata.js';
+import { makeTestStudents } from '../tests/test_assets/users/students.testdata.js';
+import { makeTestTeachers } from '../tests/test_assets/users/teachers.testdata.js';
+import { getLogger, Logger } from '../src/logging/initalize.js';
+import { Collection } from '@mikro-orm/core';
+import { Group } from '../dist/entities/assignments/group.entity.js';
+
+const logger: Logger = getLogger();
+
+export async function seedDatabase(): Promise<void> {
+    dotenv.config({ path: '.env.development.local' });
+    const orm = await initORM();
+    await orm.schema.clearDatabase();
+
+    const em = forkEntityManager();
+
+    logger.info('seeding database...');
+
+    const students = makeTestStudents(em);
+    const teachers = makeTestTeachers(em);
+    const learningObjects = makeTestLearningObjects(em);
+    const learningPaths = makeTestLearningPaths(em);
+    const classes = makeTestClasses(em, students, teachers);
+    const assignments = makeTestAssignemnts(em, classes);
+    const groups = makeTestGroups(em, students, assignments);
+
+    assignments[0].groups = new Collection<Group>(groups.slice(0, 3));
+    assignments[1].groups = new Collection<Group>(groups.slice(3, 4));
+
+    const teacherInvitations = makeTestTeacherInvitations(em, teachers, classes);
+    const classJoinRequests = makeTestClassJoinRequests(em, students, classes);
+    const attachments = makeTestAttachments(em, learningObjects);
+
+    learningObjects[1].attachments = attachments;
+
+    const questions = makeTestQuestions(em, students, groups);
+    const answers = makeTestAnswers(em, teachers, questions);
+    const submissions = makeTestSubmissions(em, students, groups);
+
+    // Persist all entities
+    await em.persistAndFlush([
+        ...students,
+        ...teachers,
+        ...learningObjects,
+        ...learningPaths,
+        ...classes,
+        ...assignments,
+        ...groups,
+        ...teacherInvitations,
+        ...classJoinRequests,
+        ...attachments,
+        ...questions,
+        ...answers,
+        ...submissions,
+    ]);
+
+    logger.info('Development database seeded successfully!');
+
+    await orm.close();
+}
+
+seedDatabase().catch(logger.error);

common/src/interfaces/answer.ts

@@ -1,14 +1,19 @@
-import { UserDTO } from './user';
 import { QuestionDTO, QuestionId } from './question';
+import { TeacherDTO } from './teacher';
 
 export interface AnswerDTO {
-    author: UserDTO;
+    author: TeacherDTO;
     toQuestion: QuestionDTO;
     sequenceNumber: number;
     timestamp: string;
     content: string;
 }
 
+export interface AnswerData {
+    author: string;
+    content: string;
+}
+
 export interface AnswerId {
     author: string;
     toQuestion: QuestionId;

common/src/interfaces/assignment.ts

@@ -2,7 +2,7 @@ import { GroupDTO } from './group';
 
 export interface AssignmentDTO {
     id: number;
-    class: string; // Id of class 'within'
+    within: string;
     title: string;
     description: string;
     learningPath: string;

common/src/interfaces/class-join-request.ts

@@ -1,8 +1,8 @@
 import { StudentDTO } from './student';
-import { ClassJoinRequestStatus } from '../util/class-join-request';
+import { ClassStatus } from '../util/class-join-request';
 
 export interface ClassJoinRequestDTO {
     requester: StudentDTO;
     class: string;
-    status: ClassJoinRequestStatus;
+    status: ClassStatus;
 }

common/src/interfaces/class.ts

@@ -3,5 +3,4 @@ export interface ClassDTO {
     displayName: string;
     teachers: string[];
     students: string[];
-    joinRequests: string[];
 }

common/src/interfaces/group.ts

@@ -1,8 +1,10 @@
 import { AssignmentDTO } from './assignment';
+import { ClassDTO } from './class';
 import { StudentDTO } from './student';
 
 export interface GroupDTO {
+    class: string | ClassDTO;
     assignment: number | AssignmentDTO;
     groupNumber: number;
-    members: string[] | StudentDTO[];
+    members?: string[] | StudentDTO[];
 }

common/src/interfaces/learning-content.ts

@@ -11,7 +11,7 @@ export interface Transition {
     };
 }
 
-export interface LearningObjectIdentifier {
+export interface LearningObjectIdentifierDTO {
     hruid: string;
     language: Language;
     version?: number;

common/src/interfaces/question.ts

@@ -1,15 +1,23 @@
-import { LearningObjectIdentifier } from './learning-content';
+import { LearningObjectIdentifierDTO } from './learning-content';
 import { StudentDTO } from './student';
+import { GroupDTO } from './group';
 
 export interface QuestionDTO {
-    learningObjectIdentifier: LearningObjectIdentifier;
+    learningObjectIdentifier: LearningObjectIdentifierDTO;
     sequenceNumber?: number;
     author: StudentDTO;
-    timestamp?: string;
+    inGroup: GroupDTO;
+    timestamp: string;
     content: string;
 }
 
+export interface QuestionData {
+    author?: string;
+    content: string;
+    inGroup: GroupDTO;
+}
+
 export interface QuestionId {
-    learningObjectIdentifier: LearningObjectIdentifier;
+    learningObjectIdentifier: LearningObjectIdentifierDTO;
     sequenceNumber: number;
 }

common/src/interfaces/submission.ts

@@ -1,15 +1,15 @@
 import { GroupDTO } from './group';
-import { LearningObjectIdentifier } from './learning-content';
+import { LearningObjectIdentifierDTO } from './learning-content';
 import { StudentDTO } from './student';
 import { Language } from '../util/language';
 
 export interface SubmissionDTO {
-    learningObjectIdentifier: LearningObjectIdentifier;
+    learningObjectIdentifier: LearningObjectIdentifierDTO;
 
     submissionNumber?: number;
     submitter: StudentDTO;
     time?: Date;
-    group?: GroupDTO;
+    group: GroupDTO;
     content: string;
 }
 

common/src/interfaces/teacher-invitation.ts

@@ -1,8 +1,16 @@
 import { UserDTO } from './user';
-import { ClassDTO } from './class';
+import { ClassStatus } from '../util/class-join-request';
 
 export interface TeacherInvitationDTO {
     sender: string | UserDTO;
     receiver: string | UserDTO;
-    class: string | ClassDTO;
+    classId: string;
+    status: ClassStatus;
+}
+
+export interface TeacherInvitationData {
+    sender: string;
+    receiver: string;
+    class: string;
+    accepted?: boolean; // Use for put requests, else skip
 }

common/src/util/class-join-request.ts

@@ -1,4 +1,4 @@
-export enum ClassJoinRequestStatus {
+export enum ClassStatus {
     Open = 'open',
     Accepted = 'accepted',
     Declined = 'declined',

docs/.gitignore

@@ -0,0 +1 @@
+api/swagger.json

docs/api/generate.ts

@@ -15,6 +15,10 @@ const doc = {
             url: 'http://localhost:3000/',
             description: 'Development server',
         },
+        {
+            url: 'http://localhost/',
+            description: 'Staging server',
+        },
         {
             url: 'https://sel2-1.ugent.be/',
             description: 'Production server',
@@ -55,4 +59,4 @@ const doc = {
 const outputFile = './swagger.json';
 const routes = ['../../backend/src/app.ts'];
 
-await swaggerAutogen({ openapi: '3.1.0' })(outputFile, routes, doc);
+void swaggerAutogen({ openapi: '3.1.0' })(outputFile, routes, doc);

eslint.config.ts

@@ -44,16 +44,16 @@ export default [
             // All @typescript-eslint configuration options are listed.
             // If the rules are commented, they are configured by the inherited configurations.
 
-            '@typescript-eslint/adjacent-overload-signatures': 'warn',
-            '@typescript-eslint/array-type': 'warn',
+            '@typescript-eslint/adjacent-overload-signatures': 'error',
+            '@typescript-eslint/array-type': 'error',
             '@typescript-eslint/await-thenable': 'error',
             '@typescript-eslint/ban-ts-comment': ['error', { minimumDescriptionLength: 10 }],
             '@typescript-eslint/ban-tslint-comment': 'error',
             camelcase: 'off',
-            '@typescript-eslint/class-literal-property-style': 'warn',
+            '@typescript-eslint/class-literal-property-style': 'error',
             'class-methods-use-this': 'off',
             '@typescript-eslint/class-methods-use-this': ['error', { ignoreOverrideMethods: true }],
-            '@typescript-eslint/consistent-generic-constructors': 'warn',
+            '@typescript-eslint/consistent-generic-constructors': 'error',
             '@typescript-eslint/consistent-indexed-object-style': 'error',
             'consistent-return': 'off',
             '@typescript-eslint/consistent-return': 'off',
@@ -64,18 +64,18 @@ export default [
             'default-param-last': 'off',
             '@typescript-eslint/default-param-last': 'error',
             'dot-notation': 'off',
-            '@typescript-eslint/dot-notation': 'warn',
-            '@typescript-eslint/explicit-function-return-type': 'warn',
+            '@typescript-eslint/dot-notation': 'error',
+            '@typescript-eslint/explicit-function-return-type': 'error',
             '@typescript-eslint/explicit-member-accessibility': 'off',
-            '@typescript-eslint/explicit-module-boundary-types': 'warn',
+            '@typescript-eslint/explicit-module-boundary-types': 'error',
             'init-declarations': 'off',
             '@typescript-eslint/init-declarations': 'off',
             'max-params': 'off',
             '@typescript-eslint/max-params': ['error', { max: 6 }],
-            '@typescript-eslint/member-ordering': 'warn',
+            '@typescript-eslint/member-ordering': 'error',
             '@typescript-eslint/method-signature-style': 'off', // Don't care about TypeScript strict mode.
             '@typescript-eslint/naming-convention': [
-                'warn',
+                'error',
                 {
                     // Enforce that all variables, functions and properties are camelCase
                     selector: 'variableLike',
@@ -113,7 +113,7 @@ export default [
             '@typescript-eslint/no-empty-function': 'error',
             '@typescript-eslint/no-empty-interface': 'off',
             '@typescript-eslint/no-empty-object-type': 'error',
-            '@typescript-eslint/no-explicit-any': 'warn', // Once in production, this should be an error.
+            '@typescript-eslint/no-explicit-any': 'error', // Once in production, this should be an error.
             '@typescript-eslint/no-extra-non-null-assertion': 'error',
             '@typescript-eslint/no-extraneous-class': 'error',
             '@typescript-eslint/no-floating-promises': 'error',
@@ -121,7 +121,7 @@ export default [
             'no-implied-eval': 'off',
             '@typescript-eslint/no-implied-eval': 'error',
             '@typescript-eslint/no-import-type-side-effects': 'error',
-            '@typescript-eslint/no-inferrable-types': 'warn',
+            '@typescript-eslint/no-inferrable-types': 'error',
             'no-invalid-this': 'off',
             '@typescript-eslint/no-invalid-this': 'off',
             '@typescript-eslint/no-invalid-void-type': 'error',
@@ -146,10 +146,10 @@ export default [
             '@typescript-eslint/no-unsafe-function-type': 'error',
 
             'no-unused-expressions': 'off',
-            '@typescript-eslint/no-unused-expressions': 'warn',
+            '@typescript-eslint/no-unused-expressions': 'error',
             'no-unused-vars': 'off',
             '@typescript-eslint/no-unused-vars': [
-                'warn',
+                'error',
                 {
                     args: 'all',
                     argsIgnorePattern: '^_',
@@ -164,53 +164,53 @@ export default [
 
             '@typescript-eslint/parameter-properties': 'off',
 
-            '@typescript-eslint/prefer-find': 'warn',
+            '@typescript-eslint/prefer-find': 'error',
 
             '@typescript-eslint/prefer-function-type': 'error',
 
             '@typescript-eslint/prefer-readonly-parameter-types': 'off',
             '@typescript-eslint/prefer-reduce-type-parameter': 'error',
 
-            '@typescript-eslint/promise-function-async': 'warn',
+            '@typescript-eslint/promise-function-async': 'error',
 
-            '@typescript-eslint/require-array-sort-compare': 'warn',
+            '@typescript-eslint/require-array-sort-compare': 'error',
 
-            'no-await-in-loop': 'warn',
+            'no-await-in-loop': 'error',
             'no-constructor-return': 'error',
             'no-inner-declarations': 'error',
             'no-self-compare': 'error',
             'no-template-curly-in-string': 'error',
-            'no-unmodified-loop-condition': 'warn',
-            'no-unreachable-loop': 'warn',
+            'no-unmodified-loop-condition': 'error',
+            'no-unreachable-loop': 'error',
             'no-useless-assignment': 'error',
 
-            'arrow-body-style': ['warn', 'as-needed'],
-            'block-scoped-var': 'warn',
-            'capitalized-comments': 'warn',
+            'arrow-body-style': ['error', 'as-needed'],
+            'block-scoped-var': 'error',
+            'capitalized-comments': 'error',
             'consistent-this': 'error',
             curly: 'error',
             'default-case': 'error',
             'default-case-last': 'error',
             eqeqeq: 'error',
-            'func-names': 'warn',
-            'func-style': ['warn', 'declaration'],
-            'grouped-accessor-pairs': ['warn', 'getBeforeSet'],
-            'guard-for-in': 'warn',
-            'logical-assignment-operators': 'warn',
-            'max-classes-per-file': 'warn',
+            'func-names': 'error',
+            'func-style': ['error', 'declaration'],
+            'grouped-accessor-pairs': ['error', 'getBeforeSet'],
+            'guard-for-in': 'error',
+            'logical-assignment-operators': 'error',
+            'max-classes-per-file': 'error',
             'no-alert': 'error',
-            'no-bitwise': 'warn',
-            'no-console': 'warn',
-            'no-continue': 'warn',
-            'no-else-return': 'warn',
+            'no-bitwise': 'error',
+            'no-console': 'error',
+            'no-continue': 'error',
+            'no-else-return': 'error',
             'no-eq-null': 'error',
             'no-eval': 'error',
             'no-extend-native': 'error',
             'no-extra-label': 'error',
-            'no-implicit-coercion': 'warn',
+            'no-implicit-coercion': 'error',
             'no-iterator': 'error',
-            'no-label-var': 'warn',
-            'no-labels': 'warn',
+            'no-label-var': 'error',
+            'no-labels': 'error',
             'no-multi-assign': 'error',
             'no-nested-ternary': 'error',
             'no-object-constructor': 'error',

frontend/eslint.config.ts

@@ -21,7 +21,14 @@ const vueConfig = defineConfigWithVueTs(
 
     {
         name: "app/files-to-ignore",
-        ignores: ["**/dist/**", "**/dist-ssr/**", "**/coverage/**", "prettier.config.js"],
+        ignores: [
+            "**/dist/**",
+            "**/dist-ssr/**",
+            "**/coverage/**",
+            "prettier.config.js",
+            "**/test-results/**",
+            "**/playwright-report/**",
+        ],
     },
 
     pluginVue.configs["flat/essential"],