Merge remote-tracking branch 'origin/dev' into feat/questions-answers-en-submissions-groep-specifiek-maken-#163

# Conflicts:
#	backend/src/controllers/questions.ts
#	backend/src/controllers/submissions.ts
#	backend/src/data/questions/question-repository.ts
#	backend/src/interfaces/group.ts
#	backend/src/interfaces/question.ts
#	backend/src/interfaces/submission.ts
#	backend/src/routes/submissions.ts
#	backend/src/services/groups.ts
#	backend/src/services/questions.ts
#	backend/src/services/students.ts
#	backend/src/services/submissions.ts
#	common/src/interfaces/question.ts

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.ts

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

common/src/interfaces/group.ts

@@ -1,7 +1,9 @@
 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[];

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

@@ -1,17 +1,17 @@
-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;
     inGroup: GroupDTO;
-    timestamp?: string;
+    timestamp: string;
     content: string;
 }
 
 export interface QuestionId {
-    learningObjectIdentifier: LearningObjectIdentifier;
+    learningObjectIdentifier: LearningObjectIdentifierDTO;
     sequenceNumber: number;
 }

common/src/interfaces/submission.ts

@@ -1,10 +1,10 @@
 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;