Symfony: doctrine custom sql order

    $this->data = Doctrine_Query::create()
            ->from('Category c')
            ->innerJoin('c.Product p')
            ->whereIn('c.slug', array('cpu', 'mainboards', 'ram', 'hdd', 'videocards', 'cases'))
            ->addWhere('p.is_published = ?', true)
            ->addOrderBy('FIELD(c.slug, "cpu", "mainboards", "ram", "hdd", "videocards", "cases")')
            ->execute()
    ;