如何修复 Symfony 4 中已弃用的用户？

Question

我收到以下错误消息：

User Deprecated: Passing configuration options directly to the constructor is deprecated since Symfony 4.2, use the default context instead.

这是 Symfony 给出的跟踪问题的代码：

$serializer = new Serializer(array(new DateTimeNormalizer('d.m.Y'), new GetSetMethodNormalizer()), array('json' => new JsonEncoder()));

但我不明白如何使用默认上下文

Answer 1

您必须直接使用该服务。

class DefaultController extends AbstractController
{
    public function index(SerializerInterface $serializer)
    {
        // keep reading for usage examples
    }
}

https://symfony.com/doc/current/serializer.html

Answer 2

根据 documentation 你必须这样使用它：

-$serializer = new Serializer(array(new DateTimeNormalizer('d.m.Y'), new GetSetMethodNormalizer()), array('json' => new JsonEncoder()));
-$serializer->serialize($myObject, 'json')

+$serializer = new Serializer(array(new DateTimeNormalizer(), new GetSetMethodNormalizer()), array('json' => new JsonEncoder()));
+$serializer->serialize($myObject, 'json', [DateTimeNormalizer::FORMAT_KEY => 'd.m.Y'])

Answer 3

我检查了导致弃用的代码（DateTimeNormalizer class 的构造函数）：

public function __construct($defaultContext = [], \DateTimeZone $timezone = null)
{
    $this->defaultContext = [
        self::FORMAT_KEY => \DateTime::RFC3339,
        self::TIMEZONE_KEY => null,
    ];

    if (!\is_array($defaultContext)) {
        @trigger_error('Passing configuration options directly to the constructor is deprecated since Symfony 4.2, use the default context instead.', E_USER_DEPRECATED);

        $defaultContext = [self::FORMAT_KEY => (string) $defaultContext];
        $defaultContext[self::TIMEZONE_KEY] = $timezone;
    }

    $this->defaultContext = array_merge($this->defaultContext, $defaultContext);
}

所以基本上它归结为更改传递给 DateTimeNormalizer 的参数（在我的例子中我有一个 CompilerPass 确实设置了参数，但在下面的例子中我将保持它的通用性）：

new DateTimeNormalizer('d.m.Y'); // old, causing the deprecation notice

// new and NOT causing the deprecation notice
new DateTimeNormalizer([
    DateTimeNormalizer::FORMAT_KEY => 'd.m.Y'
]);

如何修复 Symfony 4 中已弃用的用户？

How can I fix a deprecated user in Symfony 4?

constructor

symfony

deprecation-warning