function search()
{
$criteria = new CDbCriteria();
$criteria->with = array('mt');
$criteria->addCondition('not exists (select `id` from `' . Message::model()->tableName() . '` `m` where `m`.`language`=:lang and `m`.id=`t`.`id`)');
$criteria->compare('t.id', $this->id);
$criteria->compare('t.category', $this->category);
$criteria->compare('t.message', $this->message);
$criteria->params[':lang'] = $this->language;
return new CActiveDataProvider(get_class($this), array('criteria' => $criteria));
}