feat: (BROKEN) kolossale bug in POST group aan het fixen

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

@@ -1,4 +1,5 @@
 import {
+    Collection,
     Entity,
     Enum,
     ManyToOne,
@@ -50,5 +51,5 @@ export class Assignment {
         },
         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';
@@ -20,10 +20,8 @@ export class Group {
     @PrimaryKey({ type: 'integer', autoincrement: true })
     groupNumber?: number;
 
-    @ManyToMany({
-        entity: () => {
-            return Student;
-        },
+    @ManyToMany(() => {
+        return Student;
     })
-    members!: Student[];
+    members!: Collection<Student>;
 }

backend/src/entities/users/student.entity.ts

@@ -19,4 +19,12 @@ export class Student extends User {
         return Group;
     })
     groups!: Collection<Group>;
+
+    constructor(
+        public username: string,
+        public firstName: string,
+        public lastName: string
+    ) {
+        super();
+    }
 }