public function actionGetModelObjects($model_id)
 {
     $result = array();
     $model = $model_id::model();
     $criteria = new CDbCriteria();
     $criteria->condition = " id NOT IN (\r\n            SELECT object_id FROM " . MetaTag::tableName() . "\r\n                   WHERE model_id = '" . $model_id . "'\r\n        )";
     $objects = $model->findAll($criteria);
     foreach ($objects as $i => $object) {
         $result[$object->id] = (string) $object;
     }
     echo CJSON::encode($result);
 }