使用自定义规范化器修改类属性

Question

我有一个实体，它有两个属性，name和photo。name属性是从数据库中读取的，但是我必须用其他一些信息填充photo属性。

我遵循了来自docs的编写自定义名词化器教程，并做了自定义规范化器：

<?php

namespace App\Serializer;

use App\Entity\Style;
use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
use Symfony\Component\Serializer\Normalizer\NormalizerInterface;
use Vich\UploaderBundle\Templating\Helper\UploaderHelper;

final class StyleNormalizer implements NormalizerInterface, DenormalizerInterface
{
    private $normalizer;

    private $uploaderHelper;

    public function __construct(NormalizerInterface $normalizer, UploaderHelper $uploaderHelper)
    {
        if (!$normalizer instanceof DenormalizerInterface) {
            throw new \InvalidArgumentException('The normalizer must implement the DenormalizerInterface');
        }

        $this->normalizer = $normalizer;
        $this->uploaderHelper = $uploaderHelper;
    }

    public function denormalize($data, $class, $format = null, array $context = [])
    {
        return $this->normalizer->denormalize($data, $class, $format, $context);
    }

    public function supportsDenormalization($data, $type, $format = null)
    {
        return $this->normalizer->supportsDenormalization($data, $type, $format);
    }

    public function normalize($object, $format = null, array $context = [])
    {
        if ($object instanceof Style) {
            $object->setPhoto('http://api-platform.com');
        }

        return $this->normalizer->normalize($object, $format, $context);
    }

    public function supportsNormalization($data, $format = null)
    {
        return $this->normalizer->supportsNormalization($data, $format);
    }
}

但是photo属性没有填充所需的信息。

经过一点调试之后，我发现supportsNormalization方法被执行了两次(对于每个数据库元素)。如果打印$data变量，则第一次获得实体name属性，第二次得到带有null值的photo属性。我从来没有得到整个Style实体。然后supportsNormalitzation方法总是返回false。

如何获得完整的Style实体并修改其属性？

谢谢!

Answer 1

尝试将其添加到supportsNormalization方法中：

public function supportsNormalization($data, $format = null)
{
    return
        $this->normalizer->supportsNormalization($data, $format)
        && is_object($data) && $data instanceof Style::class
        ;
}