/**
  * 分配角色
  */
 public function assignRole(Request $request)
 {
     $user = User::find($request->get('id'));
     $roles = $request->except(['_token', 'id']);
     $user->detachRoles($user->roles()->get());
     foreach ($roles as $name => $status) {
         $role = Role::whereName($name)->first();
         if ($status == 'on') {
             $user->attachRole($role);
         }
     }
     return $this->toIndex('角色分配成功');
 }