/**
  * overide methode save
  * @param $id
  * @param $data
  */
 public function save($id, $data)
 {
     $d = array();
     foreach ($data as $key => $value) {
         if (in_array($key, $this->collectorsToSave)) {
             $d[$key] = $value;
         }
     }
     parent::save($id, $d);
 }