feat(backend): Entities toegevoegd

Entites Class, Class Join Request, Class Invitation, Assignment, Group en entities om de Dwengo-leerinhoud te modelleren, toegevoegd.

backend/src/entities/content/learning-object.entity.ts

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+import {Embeddable, Embedded, Entity, Enum, OneToMany, PrimaryKey, Property} from "@mikro-orm/core";
+import {Language} from "./language";
+import {Attachment} from "./attachment.entity";
+
+@Entity()
+export class LearningObject {
+    @PrimaryKey({type: "string"})
+    hruid!: string;
+
+    @Enum({items: () => Language, primary: true})
+    language!: Language;
+
+    @PrimaryKey({type: "string"})
+    version: number = "1";
+
+    @PrimaryKey({type: "string"})
+    author!: string;
+
+    @Property({type: "string"})
+    title!: string;
+
+    @Property({type: "longtext"})
+    description!: string;
+
+    @Property({type: "string"})
+    contentType!: string;
+
+    @Property({type: "array"})
+    keywords: string[] = [];
+
+    @Property({type: "array", nullable: true})
+    targetAges?: number[];
+
+    @Property({type: "bool"})
+    teacherExclusive: boolean = false;
+
+    @Property({type: "array"})
+    skosConcepts!: string[];
+
+    @Embedded({entity: () => EducationalGoal, array: true})
+    educationalGoals: EducationalGoal[] = [];
+
+    @Property({type: "string"})
+    copyright: string = ""
+
+    @Property({type: "string"})
+    license: string = ""
+
+    @Property({type: "smallint", nullable: true})
+    difficulty?: number;
+
+    @Property({type: "integer"})
+    estimatedTime!: number;
+
+    @Property({type: "bool"})
+    available: boolean = true;
+
+    @Property({type: "string", nullable: true})
+    contentLocation?: string;
+
+    @OneToMany({entity: Attachment})
+    attachments: Attachment[] = [];
+
+    @Property({type: "blob"})
+    content: Buffer;
+}
+
+@Embeddable()
+export class EducationalGoal {
+    @Property({type: "string"})
+    source: string;
+
+    @Property({type: "string"})
+    id: string;
+}
+
+@Embeddable()
+export class ReturnValue {
+    @Property({type: "string"})
+    callbackUrl: string;
+
+    @Property({type: "json"})
+    callbackSchema: Object;
+}
+
+export enum ContentType {
+    Markdown = "text/markdown",
+    Image = "image/image",
+    Mpeg = "audio/mpeg",
+    Pdf = "application/pdf",
+    Extern = "extern",
+    Blockly = "Blockly"
+}