问Symfony 3控制器实体参数

EN

/**
 * Finds and displays a Article entity.
 *
 * @Route("/{id}", name="article_show")
 * @Method("GET")
 * @Template("AppBundle:article:show.html.twig")
 */
public function showAction($id)
{
    $em = $this->getDoctrine()->getManager();

    $entity = $em->getRepository('AppBundle:Article')->find($id);

    if (!$entity) {
        throw $this->createNotFoundException('Unable to find Article entity.');
    }

    $deleteForm = $this->createDeleteForm($id);

    return array(
        'entity'      => $entity,
        'delete_form' => $deleteForm->createView(),
    );
}

/**
 * Finds and displays a Article entity.
 *
 * @Route("/{id}", name="article_show")
 * @Method("GET")
 */
public function showAction(Article $article)
{
    $deleteForm = $this->createDeleteForm($article);

    return $this->render('article/show.html.twig', array(
        'article' => $article,
        'delete_form' => $deleteForm->createView(),
    ));
}

public function showAction(Article $article)

    public function showAction($id)
    {
        $em = $this->getDoctrine()->getManager();
        $entity = $em->getRepository('AppBundle:Article')->find($id);
        ...
    }