feat(backend): ClassRepository & gerelateerde repo's aangemaakt

ClassRepository, ClassJoinRequestRepository en TeacherInvitationRepository aangemaakt.

backend/src/data/classes/class-join-request-repository.ts

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+import {DwengoEntityRepository} from "../dwengo-entity-repository";
+import {Class} from "../../entities/classes/class.entity";
+import {ClassJoinRequest} from "../../entities/classes/class-join-request.entity";
+import {Student} from "../../entities/users/student.entity";
+
+export class ClassJoinRequestRepository extends DwengoEntityRepository<ClassJoinRequest> {
+    public findAllRequestsBy(requester: Student): Promise<ClassJoinRequest[]> {
+        return this.findAll({where: {requester: requester}});
+    }
+    public findAllOpenRequestsTo(clazz: Class): Promise<ClassJoinRequest[]> {
+        return this.findAll({where: {class: clazz}});
+    }
+    public deleteBy(requester: Student, clazz: Class): Promise<void> {
+        return this.deleteWhere({requester: requester, class: clazz});
+    }
+}

backend/src/data/classes/class-repository.ts

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+import {DwengoEntityRepository} from "../dwengo-entity-repository";
+import {Class} from "../../entities/classes/class.entity";
+
+export class ClassRepository extends DwengoEntityRepository<Class> {
+    public findById(id: string): Promise<Class | null> {
+        return this.findOne({classId: id});
+    }
+    public deleteById(id: string): Promise<void> {
+        return this.deleteWhere({classId: id});
+    }
+}

backend/src/data/classes/teacher-invitation-repository.ts

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+import {DwengoEntityRepository} from "../dwengo-entity-repository";
+import {Class} from "../../entities/classes/class.entity";
+import {TeacherInvitation} from "../../entities/classes/teacher-invitation.entity";
+import {Teacher} from "../../entities/users/teacher.entity";
+
+export class TeacherInvitationRepository extends DwengoEntityRepository<TeacherInvitation> {
+    public findAllInvitationsForClass(clazz: Class): Promise<TeacherInvitation[]> {
+        return this.findAll({where: {class: clazz}})
+    }
+    public findAllInvitationsBy(sender: Teacher): Promise<TeacherInvitation[]> {
+        return this.findAll({where: {sender: sender}})
+    }
+    public findAllInvitationsFor(receiver: Teacher): Promise<TeacherInvitation[]> {
+        return this.findAll({where: {receiver: receiver}})
+    }
+    public deleteBy(clazz: Class, sender: Teacher, receiver: Teacher): Promise<void> {
+        return this.deleteWhere({sender: sender, receiver: receiver, class: clazz});
+    }
+}