feat: question route als subroute van learning objects

backend/src/interfaces/question.ts

@@ -1,48 +1,56 @@
 import { Question } from '../entities/questions/question.entity.js';
+import {mapToUserDTO, UserDTO} from "./user.js";
+import {LearningObjectIdentifier} from "../entities/content/learning-object-identifier.js";
+import {Teacher} from "../entities/users/teacher.entity";
 
 export interface QuestionDTO {
-    learningObjectHruid: string;
-    learningObjectLanguage: string;
-    learningObjectVersion: string;
-    sequenceNumber: number;
-    authorUsername: string;
-    timestamp: string;
+    learningObjectIdentifier: LearningObjectIdentifier;
+    sequenceNumber?: number;
+    author: UserDTO;
+    timestamp?: string;
     content: string;
-    endpoints?: {
-        classes: string;
-        questions: string;
-        invitations: string;
-        groups: string;
-    };
 }
 
 /**
  * Convert a Question entity to a DTO format.
  */
 export function mapToQuestionDTO(question: Question): QuestionDTO {
+    const learningObjectIdentifier = {
+        hruid: question.learningObjectHruid,
+        language: question.learningObjectLanguage,
+        version: question.learningObjectVersion
+    }
+
     return {
-        learningObjectHruid: question.learningObjectHruid,
-        learningObjectLanguage: question.learningObjectLanguage,
-        learningObjectVersion: question.learningObjectVersion,
+        learningObjectIdentifier,
         sequenceNumber: question.sequenceNumber,
-        authorUsername: question.author.username,
+        author: question.author,
         timestamp: question.timestamp.toISOString(),
         content: question.content,
     };
 }
 
 export interface QuestionId {
-    learningObjectHruid: string;
-    learningObjectLanguage: string;
-    learningObjectVersion: string;
+    learningObjectIdentifier: LearningObjectIdentifier;
     sequenceNumber: number;
 }
 
 export function mapToQuestionId(question: QuestionDTO): QuestionId {
     return {
-        learningObjectHruid: question.learningObjectHruid,
-        learningObjectLanguage: question.learningObjectLanguage,
-        learningObjectVersion: question.learningObjectVersion,
+        learningObjectIdentifier: question.learningObjectIdentifier,
         sequenceNumber: question.sequenceNumber,
     };
 }
+
+export function mapToQuestion(questionDTO: QuestionDTO): Question {
+    const question = new Question();
+    question.author = mapToUserDTO<Teacher>(questionDTO.author);
+    question.learningObjectHruid = questionDTO.learningObjectIdentifier.hruid;
+    question.learningObjectLanguage = questionDTO.learningObjectIdentifier.language;
+    question.learningObjectVersion = questionDTO.learningObjectIdentifier.version;
+    question.content  = questionDTO.content;
+    question.sequenceNumber = questionDTO.sequenceNumber;
+    question.timestamp = questionDTO.timestamp;
+
+    return question;
+}