Complex Find in Cake PHP

SELECT *
FROM `tips`
JOIN users ON users.id = tips.user_id
JOIN friends_users ON tips.user_id = friends_users.friend_id
WHERE (friends_users.user_id =2 or tips.user_id=2)
LIMIT 0 , 30

function findTipsByUserAndFriends($userId) {
  //FriendsUser is automagically created by CakePHP "with" association
  $conditions = array('FriendsUser.user_id'=>$userId);
  $fields = 'FriendsUser.friend_id';
  //get a list friend ids for the given user
  $friendIds = $this->Tip->User->FriendsUser->find('list', compact('conditions', 'fields'));
  //get list of all userIds for whom you want the tips
  $userIds = array($userId) + $friendIds;
  $conditions = array('Tip.user_id'=>$userIds);
  $tips = $this->Tip->find('all', compact('conditions'));
  return $tips;
}

$aCond = array(
            'fields' => array(
                'Discount.*'
            ),
            'contain' => array(
                'Event' => array(
                    'conditions' => array('Event.id' => $iEventId)
                )
            )
        );
$aBulkDiscounts = $this->Discount->find('first', $aCond);