public function destroy(Request $request)
 {
     $delete_items = $request->input('delete_items');
     if (count($delete_items) > 0) {
         $query = $this->category->whereIn('id', $delete_items);
         $query->delete();
     }
     \Flash::success(trans('message.entity_deleted', ['entity' => trans('models.category')]));
     return redirect()->route('admin.categories.index');
 }