如何使用SymfonySerializer反序列化通過提升的屬性在建構式上宣告的嵌套物件陣列？

參加以下 DTO 課程：

class UserDTO {
    /**
     * @param AddressDTO[] $addressBook
     */
    public function __construct(
        public string $name,
        public int $age,
        public ?AddressDTO $billingAddress,
        public ?AddressDTO $shippingAddress,
        public array $addressBook,
    ) {
    }
}

class AddressDTO {
    public function __construct(
        public string $street,
        public string $city,
    ) {
    }
}

我想將它們序列化和反序列化到/從 JSON。

我正在使用以下序列化程式配置：

$encoders = [new JsonEncoder()];

$extractor = new PropertyInfoExtractor([], [
    new PhpDocExtractor(),
    new ReflectionExtractor(),
]);

$normalizers = [
    new ObjectNormalizer(null, null, null, $extractor),
    new ArrayDenormalizer(),
];

$serializer = new Serializer($normalizers, $encoders);

但是當序列化/反序列化這個物件時：

$address = new AddressDTO('Rue Paradis', 'Marseille');
$user = new UserDTO('John', 25, $address, null, [$address]);

$jsonContent = $serializer->serialize($user, 'json');
dd($serializer->deserialize($jsonContent, UserDTO::class, 'json'));

我得到以下結果：

UserDTO^ {#54
   name: "John"
   age: 25
   billingAddress: AddressDTO^ {#48
     street: "Rue Paradis"
     city: "Marseille"
  }
   shippingAddress: null
   addressBook: array:1 [
    0 => array:2 [
      "street" => "Rue Paradis"
      "city" => "Marseille"
    ]
  ]
}

當我期望：

UserDTO^ {#54
   name: "John"
   age: 25
   billingAddress: AddressDTO^ {#48
     street: "Rue Paradis"
     city: "Marseille"
  }
   shippingAddress: null
   addressBook: array:1 [
    0 => AddressDTO^ {#48
       street: "Rue Paradis"
       city: "Marseille"
    }
  ]
}

如您所見，$addressBook反序列化為 的陣列array，而不是 的陣列AddressDTO。我希望從建構式中PhpDocExtractor讀取@param AddressDTO[]，但這不起作用。

它僅在我$addressBook使用@var.

有沒有辦法讓它@param在建構式上使用簡單的方法？

（非）作業演示：https : //phpsandbox.io/n/gentle-mountain-mmod-rnmqd

我讀過和嘗試過的：

• 從 docblock 注釋中提取建構式引數的型別
• symfony 反序列化嵌套物件
• 如何在 Symfony Serializer 中反序列化一組物件？

建議的解決方案似乎都不適合我。

uj5u.com熱心網友回復：

顯然問題是PhpDocExtractor沒有從建構式中提取屬性。您需要為此使用特定的建構式：

use Symfony\Component\PropertyInfo;
use Symfony\Component\Serializer;

$phpDocExtractor = new PropertyInfo\Extractor\PhpDocExtractor();
$typeExtractor   = new PropertyInfo\PropertyInfoExtractor(
    typeExtractors: [ new PropertyInfo\Extractor\ConstructorExtractor([$phpDocExtractor]), $phpDocExtractor,]
);

$serializer = new Serializer\Serializer(
    normalizers: [
                    new Serializer\Normalizer\ObjectNormalizer(propertyTypeExtractor: $typeExtractor),
                    new Serializer\Normalizer\ArrayDenormalizer(),
                 ],
    encoders:    ['json' => new Serializer\Encoder\JsonEncoder()]
);

有了這個，你會得到想要的結果。我花了一點時間才弄清楚。多個非規范化器/提取器鏈總是讓我著迷。

或者，對于更復雜的作業系統專用情況，您可以創建自己的自定義非規范化器：

use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
use Symfony\Component\Serializer\Normalizer\DenormalizerAwareInterface;
use Symfony\Component\Serializer\Normalizer\DenormalizerAwareTrait

class UserDenormalizer
    implements DenormalizerInterface, DenormalizerAwareInterface
{

    use DenormalizerAwareTrait;

    public function denormalize($data, string $type, string $format = null, array $context = [])
    {
        $addressBook = array_map(fn($address) => $this->denormalizer->denormalize($address, AddressDTO::class), $data['addressBook']);

        return new UserDTO(
            name:            $data['name'],
            age:             $data['age'],
            billingAddress:  $this->denormalizer->denormalize($data['billingAddress'], AddressDTO::class),
            shippingAddress: $this->denormalizer->denormalize($data['shippingAddress'], AddressDTO::class),
            addressBook:     $addressBook
        );
    }

    public function supportsDenormalization($data, string $type, string $format = null)
    {
        return $type === UserDTO::class;
    }
}

設定會變成這樣：

$extractor = new PropertyInfoExtractor([], [
    new PhpDocExtractor(),
    new ReflectionExtractor(),
    
]);

$userDenormalizer = new UserDenormalizer();
$normalizers      = [
    $userDenormalizer,
    new ObjectNormalizer(null, null, null, $extractor),
    new ArrayDenormalizer(),

];
$serializer       = new Serializer($normalizers, [new JsonEncoder()]);
$userDenormalizer->setDenormalizer($serializer);

輸出變成你所期望的：

^ UserDTO^ {#39
   name: "John"
   age: 25
   billingAddress: AddressDTO^ {#45
     street: "Rue Paradis"
     city: "Marseille"
  }
   shippingAddress: null
   addressBook: array:2 [
    0 => AddressDTO^ {#46
       street: "Rue Paradis"
       city: "Marseille"
    }
  ]
}

標籤：symfony 连载 symfony5

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