public function removeOrganizationsAction($id, $class, Request $request)
    {
        $object = $this->find($class, $id);
        $organizations = $this->decodeIdsString($request, 'Claroline\CoreBundle\Entity\Organization\Organization');
        $this->crud->patch($object, 'organization', Crud::COLLECTION_REMOVE, $organizations);

        return new JsonResponse(
              $this->serializer->serialize($object)
          );
    }