/**
  * Get the validation rules that apply to the request.
  *
  * @return array
  */
 public function rules()
 {
     if (isset(\Auth::user()->site_id)) {
         $sites_ids = SiteLanguages::site_access()->select(\DB::raw(' GROUP_CONCAT(id) as sites_ids'))->groupBy('sites_id')->get();
         $site_access = 'in:' . $sites_ids[0]->sites_ids;
     } else {
         $site_access = '';
     }
     return ['sitelanguages_id' => 'required|' . $site_access, 'title' => 'required|unique:topmenus,title,' . $this->topmenus, 'link' => 'required'];
 }