cakephp - query() cakephp をページ分割する方法は?

Question

    $v = array(1,11.38,15.8);
    $sortByPrice = $this->Product->query
    (
    "SELECT *,
    CASE `Product`.`currency` 
        WHEN '1' THEN $v[0]
        WHEN '2' THEN $v[1]
        WHEN '3' THEN $v[2]
    END AS 'ratio'          
    FROM `products` AS `Product` 
        LEFT JOIN `marks` AS `Mark` ON (`mark_id` = `Mark`.`id`)
        LEFT JOIN `categories` AS `Category` ON (`category_id` = `Category`.`id`)
        RIGHT JOIN `photos` AS `Photo` ON (`Photo`.`product_id` = `Product`.`id`)
    ORDER BY price*ratio DESC"
    );

このクエリをページ分割する方法は? 私は book.cake で読んだが、あまりよく説明されていない