function _getConditions($conditions, $if_add_alias = false)
 {
     $alias = '';
     if ($if_add_alias) {
         $alias = $this->alias . '.';
     }
     $res = parent::_getConditions($conditions, $if_add_alias);
     return $res ? $res . " AND {$alias}store_id = '{$this->_store_id}'" : " WHERE {$alias}store_id = '{$this->_store_id}'";
 }