ObjectNormalizer 覆盖 RelationshipNormalizer 导致代码崩溃，为什么？

Question

我正在尝试添加我自己的规范化器，因为我需要将一些原始值转换（非规范化）到它的相关实体。这就是我所做的：

namespace MMI\IntegrationBundle\Serializer\Normalizer;

use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
use Symfony\Component\Serializer\Normalizer\NormalizerInterface;

class RelationshipNormalizer implements NormalizerInterface, DenormalizerInterface
{
    public function normalize($object, $format = null, array $context = [])
    {
        // @TODO implement this method
    }

    public function supportsNormalization($data, $format = null): bool
    {
        return $data instanceof \AgreementType;
    }

    public function denormalize($data, $class, $format = null, array $context = [])
    {
        // @TODO implement this method
    }

    public function supportsDenormalization($data, $type, $format = null): bool
    {
        $supportedTypes = [
            \AgreementType::class   => true
        ];

        return isset($supportedTypes[$type]);
    }
}

这就是我在控制器中使用它的方式：

    $propertyNameConverter = new PropertyNameConverter();
    $encoder               = new JsonEncoder();

    $normalizer = new ObjectNormalizer(
        null,
        $propertyNameConverter,
        null,
        new ReflectionExtractor()
    );

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

当代码到达this method时：

private function getNormalizer($data, $format, array $context)
{
    foreach ($this->normalizers as $normalizer) {
        if ($normalizer instanceof NormalizerInterface && $normalizer->supportsNormalization($data, $format, $context)) {
            return $normalizer;
        }
    }
}

使用 Xdebug 和 IDE 我可以看到条件 $data instanceof \AgreementType 是如何完成的，但是代码再次尝试检查 Normalizer 然后 this function 被执行：

public function supportsDenormalization($data, $type, $format = null)
{
    return class_exists($type);
}

这正是我使用错误的规范化器导致以下错误的地方：

Notice: Uninitialized string offset: 0 in vendor/symfony/symfony/src/Symfony/Component/Inflector/Inflector.php at line 179

更新：

我已经尝试过这种其他方式，结果与之前完全相同，意思是相同的错误消息：

$callback = function ($value) {
    $value = $this->em->getRepository('QuoteBundle:' . $this->table_mapping[$this->entity])->find($value);

    return $value;
};

$entityNormalizer = new GetSetMethodNormalizer();
$entityNormalizer->setCallbacks([
    'agreementType'  => $callback,
]);

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

我在这里缺少什么？

Answer 1

在 Slack 上的#symfony-devs 频道获得一些帮助后，我确实发现顺序很重要。这是我的问题的解决方案（将下面的代码片段与 OP 上的代码片段进行比较，您会看到不同之处）：

$normalizer = new ObjectNormalizer(
    null,
    $propertyNameConverter,
    null,
    new ReflectionExtractor()
);

// Notice how ObjectNormalizer() is the last normalizer
$serializer = new Serializer([
    new ArrayDenormalizer(),
    new DateTimeNormalizer(),
    new RelationshipNormalizer($em),
    $normalizer,
], [$encoder]);

ObjectNormalizer 覆盖 RelationshipNormalizer 导致代码崩溃，为什么？

ObjectNormalizer overrides RelationshipNormalizer causing code to crash, why?

php

symfony

symfony-3.2