使用自定义标准化器修改 class 属性

Question

我有一个具有 2 个属性的实体，name 和 photo。 name 属性是从数据库中读取的，但我必须用一些其他信息填充 photo 属性。

我遵循了文档中的 Writing a Custom Nomalizer 教程，并且制作了自定义规范化器：

<?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属性没有填入需要的信息

经过一些调试后，我发现 supportsNormalization 方法执行了两次（针对每个数据库元素）。如果我打印 $data 变量，我第一次得到实体 name 属性，第二次得到 photo 属性和 null 值.我从来没有得到整个 Style 实体。然后 supportsNormalitzation 方法总是 returns false.

如何获取完整的 Style 实体并修改其属性？

谢谢！

Answer 1

尝试将此添加到您的 supportsNormalization 方法中：

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

使用自定义标准化器修改 class 属性

Use custom normalizer to modify class properties

php

symfony

api-platform.com