api - 交响乐 2 : How to use the ParamConverter with a PUT method to get or create an entity object

Question

我需要使用 PUT 方法实现一个 API，我想在我的 Controller 中使用 ParamConverter 来查找现有实体对象，或者如果实体对象不存在，则创建一个新实体对象。

但是，如果在存储库中找不到实体对象，标准的 Symfony ParamConverter 会返回一个异常。

你有什么想法可以用一种干净整洁的方式做到这一点吗？谢谢。

这是我想做的事情的一个例子(我使用 FOS REST Bundle 来处理 PUT 请求):

/**
 * @param Request $request
 * @return View
 *
 * @ParamConverter("video")
 *
 */
public function putVideosAction(Request $request, Video $video)
{
    try {
        return $this->getHandlerVideos()->put($video, $request->request->all());
    } catch (InvalidFormException $e) {
        return $e->getForm();
    }
}

Answer 1

这是一个解决方案。请告诉我您对此的看法。

在你的 Controller 中，我会这样做:

/**
 * @param Request $request
 * @return View
 *
 * @Rest\Put()
 * @Rest\View()
 *
 * @ParamConverter("video", converter="app_get_or_create_entity_converter", options={"repository_method" = "findOneById"})
 */
public function putVideosAction(Request $request, Video $video)
{
    try {
        $video = $this->getHandlerVideos()->put($video, $request->request->all());
        return $video;
    } catch (InvalidFormException $e) {
        return $e->getForm();
    }
}

我会这样写一个动态参数转换器:

    class GetOrCreateEntityConverter implements \Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\ParamConverterInterface
{
    /**
     * @var EntityManagerInterface
     */
    protected $entityManager;

    /**
     * @var ManagerRegistry $registry Manager registry
     */
    private $registry;

    /**
     * @param ManagerRegistry $registry
     * @param EntityManagerInterface $entityManager
     */
    public function __construct(ManagerRegistry $registry, EntityManagerInterface $entityManager)
    {
        $this->registry = $registry;
        $this->entityManager = $entityManager;
    }

    public function supports(ParamConverter $configuration)
    {
        if ('app_get_or_create_entity_converter' !== $configuration->getConverter()) {
            return false;
        }

        return true;
    }

    /**
     * {@inheritdoc}
     *
     * Applies converting
     *
     * @throws \InvalidArgumentException When route attributes are missing
     * @throws NotFoundHttpException     When object not found
     */
    public function apply(Request $request, ParamConverter $configuration)
    {
        $name    = $configuration->getName();
        $options = $configuration->getOptions();
        $class   = $configuration->getClass();
        $repository = $this->entityManager->getRepository($class);

        $repositoryMethod = $options['repository_method'];

        if (!is_callable([$repository, $repositoryMethod])) {
            throw new \BadMethodCallException($repositoryMethod . ' function does not exist.', 405);
        }

        $entity = $repository->$repositoryMethod($id);

        if (null === $entity) {
            $entity = new $class;
        }

        $request->attributes->set($name, $entity);
    }
}

如果你问我为什么在catch中返回一个表单，请去看https://github.com/liuggio/symfony2-rest-api-the-best-2013-way/blob/master/src/Acme/BlogBundle/Controller/PageController.php