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

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

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+import {Student} from "../users/student.entity";
+import {Group} from "./group.entity";
+import {Entity, Enum, ManyToOne, PrimaryKey, Property} from "@mikro-orm/core";
+import {Language} from "../content/language";
+
+@Entity()
+export class Submission {
+    @PrimaryKey({type: "string"})
+    learningObjectHruid!: string;
+
+    @Enum({items: () => Language, primary: true})
+    learningObjectLanguage!: Language;
+
+    @PrimaryKey({type: "string"})
+    learningObjectVersion: string = "1";
+
+    @PrimaryKey({type: "integer"})
+    submissionNumber!: number;
+
+    @ManyToOne({entity: () => Student})
+    submitter!: Student;
+
+    @Property({type: "datetime"})
+    submissionTime!: Date;
+
+    @ManyToOne({entity: () => Group, nullable: true})
+    onBehalfOf?: Group;
+
+    @Property({type: "json"})
+    content!: string;
+}