containable group by

Is there a way to add a "group by" clause into a "contain"?

$this->find('all', array(
'conditions' => $conditions,
'contain' => array(
'Vote' => array(
'fields' =>
array('SUM(Vote.rank)/COUNT(Vote.id) AS rank'),
// 'group' =>
array('Post.id') <--- this is not working
),
'Author' => array( 'fields'
=> array(' Author.name, Author.surname' ))
),
'page'=>$order,
'limit'=>$limit,
'order'=>$order,
'fields'=>$fields,
)
);

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