function read($params)
 {
     $result = parent::read($params);
     if ($this->has_results($result)) {
         foreach ($result['results'] as &$record) {
             $record['is_image'] = $this->is_image($record);
         }
     }
     return $result;
 }
 function read($params)
 {
     $result = parent::read($params);
     return $result;
 }
 function read($params)
 {
     $params['filters']['object_type'] = $this->get_object_type();
     return parent::read($params);
 }