symfony：如何通过_partial执行操作

in my application, I have a menu which is a partial (_menu.php)

I need in my menu which is on the entire application, to have access to that :

$this->user = $this->getUser()->getGuardUser();
$this->unread = Doctrine::getTable('sfSocialMessageRcpt')->countUnreadMessages($this->user);

But how to create an action for my partial which is rendered in the entire application ?

Thanks

ok, i used components instead. it fixed my problem