Question

我有以下代码行

$apps = $appRepositry->findBy(['user' => $user]);

然后我使用以下内容通过JSON返回结果

$json_data[] = array(
                            "state" => "success",
                            "user_apps" => $apps,
                            "total_registerd_apps" => count($apps),
                            );

我遇到的问题是计数正确，但是“ user_apps”数组返回空白。

 {
    state = success;
    "total_registerd_apps" = 1;
    "user_apps" =     (
                {
        }
    );
}

我认为这是因为FindBy返回对象，但我不确定。有人可以解释如何将结果转换为可以通过JSON发送的数组吗？

谢谢

Answer 1

您需要对组使用序列化程序。

有关序列化的信息： http://symfony.com/doc/current/components/serializer.html

有关序列化组的信息： https://symfony.com/blog/new-in-symfony-2-7-serialization-groups

 public function listAction(ParamFetcherInterface $paramFetcher, Request $request)
{
    //...your code...//
    $yourObjectifiedResult = $appRepositry->findBy(['user' => $user]);
    $yourNormalizedResult = $this->normalizeWithCircularHandler(
                $yourObjectifiedResult,
                ['groups']);
    //Serializer will convert your result from Object to Json Array automatically. To get a specific set of data, you can use groups.
}

public function normalizeWithCircularHandler($data, $displayGroups, $normalizerCallbacks = false)
{
    $encoder = new JsonEncoder();

    $classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
    $normalizer = new ObjectNormalizer($classMetadataFactory);

    $normalizer->setCircularReferenceHandler(function ($object) {
        return $object->getId();
    });

    if(false != $normalizerCallbacks && is_array($normalizerCallbacks)) {
        $normalizer->setCallbacks($normalizerCallbacks);
    }

    $serializer = new Serializer([$normalizer], [$encoder]);

    return $serializer->normalize($data , null, ['groups' => $displayGroups]);
}

Answer 2

您需要使用序列化程序将数据序列化为JSON： https://symfony.com/doc/current/serializer.html

Symfony 4 FindBy（）并通过JSON返回数组

2 个答案: