public function listSubCollectionsAction($collectionId)
    {
        $pager = $this->get('sonata.classification.manager.collection')
            ->getSubCollectionsPager($collectionId, $this->getCurrentRequest()->get('page'));

        return $this->render('SonataProductBundle:Collection:list_sub_collections.html.twig', [
            'pager' => $pager,
        ]);
    }