Add function truncate to \Phalcon\Mvc\Model

Hi. Excuse me my missknowledge of phalcon, if i am wrong and show me the right way to truncate table.

Now im doing this:

class CurrencyCourse extends \Phalcon\Mvc\Model {

/**
 *
 * @var integer
 */
public $FROM_ID;

/**
 * Independent Column Mapping.
 */
public function columnMap()
{
    return array(
        'FROM_ID' => 'FROM_ID', 
    );
}

/**
 * Clear all table
 */
public function truncate() {
    $this->getDi()->getShared('db')->query("truncate table ".$this->getSource());
}
#or this 
    /**
 * Clear all table
 */
public function truncate() {
    // Instantiate the Query
    (new \Phalcon\Mvc\Model\Query("truncate table ".$this->getSource(), $this->getDI()))->execute();
}

} But i think it should be less level (C compiled).