Symfony2分页控制器错误

Question

我正在尝试对产品列表进行分页，但是遇到错误。 这是ProductsController.php文件中的indexAction 。

public function indexAction($page)
    {
        $em = $this->getDoctrine()->getManager();

        $entities = $em->getRepository('IbwTazJazBundle:Products')->findAll();

        $total_products = $em->getRepository('IbwTazJazBundle:Products')->countActiveProducts($entities->getId());
        $products_per_page = $this->container->getParameter('max_products_on_homepage');
        $last_page = ceil($total_products / $products_per_page);
        $previous_page = $page > 1 ? $page - 1 : 1;
        $next_page = $page < $last_page ? $page + 1 : $last_page;
        $entities->setActiveProducts($em->getRepository('IbwTazJazBundle:Products')->getActiveProducts($entities->getId(), $products_per_page, ($page - 1) * $products_per_page));



        return $this->render('IbwTazJazBundle:Products:index.html.twig', array(
            'entities' => $entities,
            'last_page' => $last_page,
            'previous_page' => $previous_page,
            'current_page' => $page,
            'next_page' => $next_page,
            'total_products' => $total_products

        ));
    }

刷新页面时，我收到一条Error: Call to a member function getId() on a non-object消息Error: Call to a member function getId() on a non-object并引用下面的行：

$total_products = $em->getRepository('IbwTazJazBundle:Products')->countActiveProducts($entities->getId());

我不确定自己在做什么错。 有什么建议么？

Answer 1

findAll()返回对象的Collection。 这意味着即使表中只有一个对象，它也将返回由1个元素组成的数组，例如[0=> Product]

由于您的桌子被命名为产品，我怀疑您只有一行。