public function service()
 {
     $categoryManager = new CategoryManager($this->config, $this->args);
     $categoryId = $this->secure($_REQUEST["category_id"]);
     $display_name = $this->secure($_REQUEST["display_name"]);
     $last_clickable = $this->secure($_REQUEST["last_clickable"]);
     $adminManager = new AdminManager($this->config, $this->args);
     $adminId = $this->sessionManager->getUser()->getId();
     $adminDto = $adminManager->selectByPK($adminId);
     if ($adminDto) {
         $categoryDto = $categoryManager->getCategoryById($categoryId);
         if (!$categoryDto) {
             $jsonArr = array('status' => "err", "errText" => "System Error: Category doesn't exist!");
             echo json_encode($jsonArr);
             return false;
         }
         $categoryManager->updateCategoryAttributes($categoryId, $display_name, $last_clickable);
         $jsonArr = array('status' => "ok", "message" => "ok");
         echo json_encode($jsonArr);
         return true;
     } else {
         $jsonArr = array('status' => "err", "errText" => "System Error: You are not Admin!");
         echo json_encode($jsonArr);
         return false;
     }
 }