public function listBelongingJsonAction()
 {
     $properties = array();
     $staff = \StaffAuthenticationBackend::getUser();
     if (isset($staff)) {
         $items = \model\Equipment::findByStaffId($staff->getId());
     }
     foreach ($items as $item) {
         $properties[] = $item->getJsonProperties();
     }
     echo json_encode($properties);
 }