与SequelizeJS的承诺

Question

我需要使用SequelizeJS的承诺，但我想确保我的代码干净......

我的代码：

public function OfferIndex(Request $request)
{
    //working solution
    $em    = $this->getDoctrine()->getManager();
    $queryBuilder = $em->createQueryBuilder();
    $queryBuilder->select(array('o', 't', 'r', 'c'))
        ->from('BackBundle\Entity\offer', 'o')
        ->leftJoin('o.offerType', 't')
        ->leftJoin('o.offerRegion', 'r')
        ->leftJoin('o.offerCategory', 'c')

    ;
    if (isset($_REQUEST['offerKey'])) {
        $queryBuilder
            ->where('CONCAT(o.name,o.technologies,t.name,r.name,c.name) LIKE :search')
            ->setParameter('search', '%' . $_REQUEST['offerKey'] . '%');
    }

    $query = $queryBuilder->getQuery();

    $paginator  = $this->get('knp_paginator');
    $pagination = $paginator->paginate(
        $query, /* query NOT result */
        $request->query->getInt('page', 1)/*page number*/,
        2/*limit per page*/
    );

    return $this->render('FrontBundle:pages:Offre d\'emploi et de stage .html.twig',array(
        'pagination' => $pagination
    ));
}

如何使用嵌套承诺？