merge: merge fix/183-post-assignment into dev

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

@@ -12,7 +12,7 @@
         "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/controllers/questions.ts

@@ -1,8 +1,15 @@
 import { Request, Response } from 'express';
-import { createQuestion, deleteQuestion, getAllQuestions, getQuestion, updateQuestion } from '../services/questions.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 { QuestionData, 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';
 
@@ -30,7 +37,18 @@ export async function getAllQuestionsHandler(req: Request, res: Response): Promi
 
     const learningObjectId = getLearningObjectId(hruid, version, language);
 
-    const questions = await getAllQuestions(learningObjectId, full);
+    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 {
+        questions = await getAllQuestions(learningObjectId, full ?? false);
+    }
 
     res.json({ questions });
 }
@@ -60,7 +78,8 @@ export async function createQuestionHandler(req: Request, res: Response): Promis
 
     const author = req.body.author as string;
     const content = req.body.content as string;
-    requireFields({ author, content });
+    const inGroup = req.body.inGroup;
+    requireFields({ author, content, inGroup });
 
     const questionData = req.body as QuestionData;
 

backend/src/controllers/submissions.ts

@@ -1,10 +1,32 @@
 import { Request, Response } from 'express';
-import { createSubmission, deleteSubmission, getAllSubmissions, getSubmission } from '../services/submissions.js';
-import { BadRequestException } from '../exceptions/bad-request-exception.js';
-import { LearningObjectIdentifier } from '../entities/content/learning-object-identifier.js';
-import { Language, languageMap } from '@dwengo-1/common/util/language';
+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';
+
+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, res: Response): Promise<void> {
     const lohruid = req.params.hruid;

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/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 }, { populate: [ "groups", "groups.members" ]});
     }
+    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 }, populate: [ "groups", "groups.members" ] });
     }

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(
@@ -50,11 +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/question-repository.ts

@@ -5,15 +5,16 @@ 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";
+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(),
         });
@@ -21,6 +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);
     }
@@ -60,7 +62,9 @@ export class QuestionRepository extends DwengoEntityRepository<Question> {
 
     public async findAllByAssignment(assignment: Assignment): Promise<Question[]> {
         return this.find({
-            author: assignment.groups.toArray<Group>().flatMap((group) => group.members),
+            inGroup: {
+                $contained: assignment.groups,
+            },
             learningObjectHruid: assignment.learningPathHruid,
             learningObjectLanguage: assignment.learningPathLanguage,
         });
@@ -73,6 +77,38 @@ export class QuestionRepository extends DwengoEntityRepository<Question> {
         });
     }
 
+    /**
+     * 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,

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/group.ts

@@ -1,17 +1,31 @@
 import { Group } from '../entities/assignments/group.entity.js';
-import { Class } from '../entities/classes/class.entity.js';
+import { mapToAssignment } from './assignment.js';
+import { mapToStudent } from './student.js';
+import { mapToAssignmentDTO } from './assignment.js';
 import { mapToStudentDTO } from './student.js';
 import { GroupDTO, GroupDTOId } 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 mapToGroupDTO(group: Group, cls: Class, options?: { expandStudents: boolean }): GroupDTO {
+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, cls: Class): GroupDTO {
     return {
         class: cls.classId!,
         assignment: group.assignment.id!,
         groupNumber: group.groupNumber!,
-        members: 
-            options?.expandStudents 
-            ? group.members.map(mapToStudentDTO)
-            : group.members.map((student) => student.username)
+        members: group.members.map(mapToStudentDTO)
 
     };
 }
@@ -23,3 +37,15 @@ export function mapToGroupDTOId(group: Group, cls: Class): GroupDTOId {
         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

@@ -3,6 +3,7 @@ import { mapToStudentDTO } from './student.js';
 import { QuestionDTO, QuestionId } from '@dwengo-1/common/interfaces/question';
 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): LearningObjectIdentifierDTO {
     return {
@@ -30,6 +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

@@ -1,10 +1,10 @@
-import { getSubmissionRepository } from '../data/repositories.js';
-import { Group } from '../entities/assignments/group.entity.js';
 import { Submission } from '../entities/assignments/submission.entity.js';
-import { Student } from '../entities/users/student.entity.js';
 import { mapToGroupDTO } from './group.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 {
@@ -32,7 +32,7 @@ export function mapToSubmissionDTOId(submission: Submission): SubmissionDTOId {
     };
 }
 
-export function mapToSubmission(submissionDTO: SubmissionDTO, submitter: Student, onBehalfOf: Group | undefined): Submission {
+export function mapToSubmission(submissionDTO: SubmissionDTO, submitter: Student, onBehalfOf: Group): Submission {
     return getSubmissionRepository().create({
         learningObjectHruid: submissionDTO.learningObjectIdentifier.hruid,
         learningObjectLanguage: submissionDTO.learningObjectIdentifier.language,

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/routes/submissions.ts

@@ -1,9 +1,9 @@
 import express from 'express';
-import { createSubmissionHandler, deleteSubmissionHandler, getAllSubmissionsHandler, 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('/', getAllSubmissionsHandler);
+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/groups.ts

@@ -1,7 +1,7 @@
 import { EntityDTO } from '@mikro-orm/core';
 import { getGroupRepository, getSubmissionRepository } from '../data/repositories.js';
 import { Group } from '../entities/assignments/group.entity.js';
-import { mapToGroupDTO, mapToGroupDTOId } from '../interfaces/group.js';
+import { mapToGroupDTO, mapToGroupDTOId, mapToShallowGroupDTO } from '../interfaces/group.js';
 import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
 import { GroupDTO, GroupDTOId } from '@dwengo-1/common/interfaces/group';
 import { SubmissionDTO, SubmissionDTOId } from '@dwengo-1/common/interfaces/submission';

backend/src/services/questions.ts

@@ -1,12 +1,34 @@
-import { getQuestionRepository } from '../data/repositories.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 { 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';
-import { fetchStudent } from './students.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();
@@ -38,14 +60,40 @@ export async function getQuestion(questionId: QuestionId): Promise<QuestionDTO>
     return mapToQuestionDTO(question);
 }
 
+export async function getAnswersByQuestion(questionId: QuestionId, full: boolean): Promise<AnswerDTO[] | AnswerId[]> {
+    const answerRepository = getAnswerRepository();
+    const question = await fetchQuestion(questionId);
+
+    if (!question) {
+        return [];
+    }
+
+    const answers: Answer[] = await answerRepository.findAllAnswersToQuestion(question);
+
+    if (!answers) {
+        return [];
+    }
+
+    if (full) {
+        return answers.map(mapToAnswerDTO);
+    }
+
+    return answers.map(mapToAnswerDTOId);
+}
+
 export async function createQuestion(loId: LearningObjectIdentifier, questionData: QuestionData): Promise<QuestionDTO> {
     const questionRepository = getQuestionRepository();
     const author = await fetchStudent(questionData.author!);
     const content = questionData.content;
 
+    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 question = await questionRepository.createQuestion({
         loId,
         author,
+        inGroup: inGroup!,
         content,
     });
 

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, mapToGroupDTOId, mapToShallowGroupDTO } from '../interfaces/group.js';
 import { mapToStudent, mapToStudentDTO } from '../interfaces/student.js';
 import { mapToSubmissionDTO, mapToSubmissionDTOId } from '../interfaces/submission.js';
 import { getAllAssignments } from './assignments.js';
@@ -24,6 +24,7 @@ import { SubmissionDTO, SubmissionDTOId } from '@dwengo-1/common/interfaces/subm
 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();
@@ -113,7 +114,8 @@ export async function getStudentSubmissions(username: string, full: boolean): Pr
     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);

backend/src/services/submissions.ts

@@ -1,4 +1,4 @@
-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';
@@ -6,6 +6,7 @@ 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 fetchSubmission(loId: LearningObjectIdentifier, submissionNumber: number): Promise<Submission> {
     const submissionRepository = getSubmissionRepository();
@@ -32,9 +33,7 @@ export async function getAllSubmissions(loId: LearningObjectIdentifier): Promise
 
 export async function createSubmission(submissionDTO: SubmissionDTO): Promise<SubmissionDTO> {
     const submitter = await fetchStudent(submissionDTO.submitter.username);
-    // TODO: fix
-    // const group = submissionDTO.group ? await getExistingGroupFromGroupDTO(submissionDTO.group) : undefined;
-    const group = undefined;
+    const group = await getExistingGroupFromGroupDTO(submissionDTO.group!);
 
     const submissionRepository = getSubmissionRepository();
     const submission = mapToSubmission(submissionDTO, submitter, group);
@@ -51,3 +50,22 @@ export async function deleteSubmission(loId: LearningObjectIdentifier, submissio
 
     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

@@ -28,7 +28,7 @@ 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[]> {
@@ -160,10 +160,10 @@ export async function updateClassJoinRequestStatus(studentUsername: string, clas
         throw new NotFoundException('Join request not found');
     }
 
-    request.status = ClassJoinRequestStatus.Declined;
+    request.status = ClassStatus.Declined;
 
     if (accepted) {
-        request.status = ClassJoinRequestStatus.Accepted;
+        request.status = ClassStatus.Accepted;
         await addClassStudent(classId, studentUsername);
     }
 

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/data/assignments/assignments.test.ts

@@ -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/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;
@@ -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/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-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/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/tool/seed.ts

@@ -14,6 +14,8 @@ import { makeTestQuestions } from '../tests/test_assets/questions/questions.test
 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();
 
@@ -34,8 +36,8 @@ export async function seedDatabase(): 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<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);
@@ -43,7 +45,7 @@ export async function seedDatabase(): 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);