Symfony/serializer 规范化对象中的对象

Question

大家好，需要一点帮助我没有找到关于递归规范化对象的回复

    class User
    {
        public $email;
        public $userId;
        public $userName;
        /**
         * @var CustomAttributes
         */
        public $customAttributes;
    }
    class CustomAttributes
    {
        public $someStuff;
        public $someStuffHere;
    }

我只是想通过 symfony 组件的 normalize() 把它变成一个数组 snake_case

$normalizer = new PropertyNormalizer(null, new CamelCaseToSnakeCaseNameConverter());
$user_normalize = $normalizer->normalize($user);

但我有这个错误

在 AbstractObjectNormalizer.php 第 129 行： 无法规范化属性“customAttributes”，因为注入 序列化器不是规范化器

感谢您的帮助

Answer 1

这是因为您忘记添加$serializer = new Serializer([$normalizer]) 位。请参阅下面的工作示例。

实施

use App\User;
use App\CustomAttributes;
use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory;
use Symfony\Component\Serializer\NameConverter\CamelCaseToSnakeCaseNameConverter;
use Symfony\Component\Serializer\Normalizer\PropertyNormalizer;
use Symfony\Component\Serializer\Serializer;

class SnakeCaseUtility
{
    public function convert(): array
    {
        $classMetadataFactory = null;
        $nameConverter = new CamelCaseToSnakeCaseNameConverter();

        $normalizer = new PropertyNormalizer($classMetadataFactory, $nameConverter);
        $serializer = new Serializer([$normalizer]);

        $normalizedUser = $serializer->normalize($this->getUser(), 'json');

        return $normalizedUser;
    }

    private function getUser(): User
    {
        $customAttributes = new CustomAttributes();
        $customAttributes->someStuff = 'Some stuff';
        $customAttributes->someStuffHere = 'Some stuff here';

        $user = new User();
        $user->userId = 123;
        $user->userName = 'Hello World';
        $user->email = 'hello@world.com';
        $user->customAttributes = $customAttributes;

        return $user;
    }
}

测试

use App\SnakeCaseUtility;
use PHPUnit\Framework\TestCase;

class SnakeCaseUtilityTest extends TestCase
{
    public function testSnakeCase(): void
    {
        $expected = [
            'email' => 'hello@world.com',
            'user_id' => 123,
            'user_name' => 'Hello World',
            'custom_attributes' => [
                'some_stuff' => 'Some stuff',
                'some_stuff_here' => 'Some stuff here',
            ]
        ];

        $this->assertSame($expected, (new SnakeCaseUtility())->convert());
    }
}

结果

$ vendor/bin/phpunit --filter SnakeCaseUtilityTest tests/SnakeCaseUtilityTest.php 
PHPUnit 7.5.1 by Sebastian Bergmann and contributors.

.                                                                   1 / 1 (100%)

Time: 83 ms, Memory: 4.00MB

OK (1 test, 1 assertion)