/**
  * @param \Notadd\Menu\Requests\MenuGroupEditRequest $request
  * @param $id
  * @return \Illuminate\Http\RedirectResponse
  */
 public function update(MenuGroupEditRequest $request, $id)
 {
     $group = MenuGroup::findOrFail($id);
     if ($group->update($request->all())) {
         return $this->redirect->to("admin/menu");
     } else {
         return $this->redirect->back()->withInput()->withErrors('保存失败!');
     }
 }