使用上下文的\\”circular_reference_handler\\”键代替symfony 4.2

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Use the "circular_reference_handler" key of the context instead symfony 4.2

我必须序列化一个对象，但我得到了非常常见的"循环引用错误"

我使用了旧的 Symfony 方法：

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}

这项工作，但从 Symfony 4.2 开始，我得到了你在这个问题的标题中看到的异常：

use the"circular_reference_handler" key of the context instead Symfony 4.2

我在 Symfony 文档中找不到关于序列化器的任何引用。

https://symfony.com/doc/current/components/serializer.html#handling-circular-references

有谁知道如何使用这个"上下文键"而不是旧方法？

不幸的是，它在文档中有点隐藏，但是您可以创建一个类而不是使用匿名函数，然后将序列化程序配置为默认使用此服务。

它是配置参考的一部分：https://symfony.com/doc/current/reference/configuration/framework.html#reference-serializer-circular-reference-handler

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}

没有指定接口。相反，该类需要是可调用的。因此，在您的情况下，它可能如下所示：

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}

@dbrumann 的答案的附录，它几乎对我有用。在我的 Symfony 4.3 应用程序中，YAML 的 serializer 部分需要一个父 framework 容器。所以：

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}

然后在引用处理程序中：

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}

要检查配置值是否正确加载，您可以使用 Symfony 控制台：

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}

如果正确加载了配置值，您应该会在输出的相应部分下看到它们。

您可以在此处查看对此配置键的引用：https://symfony.com/doc/current/reference/configuration/framework.html#circular-reference-handler 该文档尚未更新以显示此用法配置键

必须在您的配置文件之一(例如framework.yml)中使用此配置键来设置用于处理循环引用的服务

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}

在 messenger 配置中，您可以像这样调用对象方法：

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}
$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}

或者，您可以在上下文属性中提供动态处理程序：

$normalizer = new ObjectNormalizer();

// Add Circular reference handler

$normalizer->setCircularReferenceHandler(function ($object) {

  return $object->getId();

});

$normalizers = array($normalizer);

$encoders = [new JsonEncoder()];

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

# config/packages/serializer.yaml



serializer:

  circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler

{

  public function __invoke($object)

  {

    return $object->id;

  }

}

# config/packages/serializer.yaml



framework:

  serializer:

    circular_reference_handler: 'App\\Serializer\\MyCircularReferenceHandler'

class MyCircularReferenceHandler {

  public function __invoke($object) {

    return $object->id;

  }

}
$ php bin/console debug:config frameworkserializer:

  circular_reference_handler: App\\Service\\YourCircularReferenceHandler
class CircularReferenceHandler

{

  public function handle($object, string $format, array $context)

  {

    return $object->getId();

  }

}

# config/package/messenger.yaml

framework:

 messenger:

  serializer:

   default_serializer: messenger.transport.symfony_serializer

   symfony_serializer:

    format: json

    context: {circular_reference_handler: 'App\\application\\Helpers\\CircularReferenceHandler::handle'}

public function normalize($user, $format = null, array $context = [])

{

  // Handle circular references

  // DEPRECATED in sf 4.2 : 

  // $this->normalizer->setCircularReferenceHandler(function ($object) {return $object->getId();});



  // Good way in sf > 4.2

  $context['circular_reference_handler'] = function ($object) {return $object->getId();};

  // Return data

  $data = $this->normalizer->normalize($user, $format, $context);

}
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