feat(backend): Assignment-, Group- en SubmissionRepository aangemaakt

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

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+import {Entity, Enum, ManyToOne, OneToMany, PrimaryKey, Property} from "@mikro-orm/core";
+import {Class} from "../classes/class.entity";
+import {Group} from "./group.entity"
+import {Language} from "../content/language";
+
+@Entity()
+export class Assignment {
+    @ManyToOne({entity: () => Class, primary: true})
+    within!: Class;
+
+    @PrimaryKey({type: "number"})
+    id!: number;
+
+    @Property({type: "string"})
+    title!: string;
+
+    @Property({type: "text"})
+    description!: string;
+
+    @Property({type: "string"})
+    learningPathHruid!: string;
+
+    @Enum({items: () => Language})
+    learningPathLanguage!: Language;
+
+    @OneToMany({entity: () => Group, mappedBy: "assignment"})
+    groups!: Group[];
+}