Create new projectors with clos reference

New projectors will be created on a reference to the current list of
of speakers

client/src/app/core/repositories/projector/projector-repository.service.ts

@@ -135,4 +135,11 @@ export class ProjectorRepositoryService extends BaseRepository<ViewProjector, Pr
     public async setReferenceProjector(projector_id: number): Promise<void> {
         await this.http.post<void>(`/rest/core/projector/${projector_id}/set_reference_projector/`);
     }
+
+    /**
+     * return the id of the current reference projector
+     */
+    public getReferenceProjectorId(): number {
+        return this.getViewModelList().find(projector => projector.isReferenceProjector).id;
+    }
 }

client/src/app/site/projector/components/projector-list/projector-list.component.ts

@@ -113,7 +113,8 @@ export class ProjectorListComponent extends BaseViewComponent implements OnInit,
         dialogRef.afterClosed().subscribe(result => {
             if (result) {
                 const projectorToCreate: Partial<Projector> = {
-                    name: this.createForm.value.name
+                    name: this.createForm.value.name,
+                    reference_projector_id: this.repo.getReferenceProjectorId()
                 };
 
                 this.repo.create(projectorToCreate).then(() => {