public function revokePermissions($id, $permission_id)
 {
     $role = $this->repository->find($id);
     $permission = $this->permissionRepository->find($permission_id);
     $role->revokePermission($permission);
     return redirect()->back();
 }
 public function destroy($id)
 {
     $this->repository->find($id)->delete();
     return redirect()->back();
 }