/**
* Deletes all preferences.
*
* @param void
* @return int The number of preferences deleted
*/
public function expungePreferences()
{
return \D2EM::createQuery('delete \\Entities\\' . $this->_getPreferenceClassName() . ' up where up.' . $this->_getShortClassname() . ' = ?1')->setParameter(1, $this)->execute();
}
