How can I remove deprecated message for circular reference handler (Symfony 4)?

Question

I am trying to remove this error message:

User Deprecated: The "Symfony\\Component\\Serializer\\Normalizer\\AbstractNormalizer::setCircularReferenceHandler()" method is deprecated since Symfony 4.2, use the "circular_reference_handler" key of the context instead.

Here is my code:

 $encoder = new JsonEncoder();
    $normalizer = new ObjectNormalizer();
    $normalizer->setCircularReferenceHandler(function ($object, string $format = null, array $context = []) {
        return $object->getName();
    });

I made a composer update and cache clear. But nothing helps.

Answer 1

The error message tells that you should give it in the defaultContext array you can give that as third parameter in the costructor.

public function __construct(ClassMetadataFactoryInterface 
$classMetadataFactory = null, NameConverterInterface $nameConverter = null, array $defaultContext = array())

in your case it would be:

$encoders = array(new JsonEncoder());
$normalizer = new JsonSerializableNormalizer(null,null,array(JsonSerializableNormalizer::CIRCULAR_REFERENCE_HANDLER=>function ($object) {
    return (string)$object;
}));

EDIT:
I was using a JsonSerializableNormalizer and you an ObjectNormalizer then the constructor definition is:

public function __construct(ClassMetadataFactoryInterface $classMetadataFactory = null, NameConverterInterface $nameConverter = null, PropertyAccessorInterface $propertyAccessor = null, PropertyTypeExtractorInterface $propertyTypeExtractor = null, ClassDiscriminatorResolverInterface $classDiscriminatorResolver = null, callable $objectClassResolver = null, array $defaultContext = array())

and used in your program it should be:

$normalizer = new ObjectNormalizer(null,null,null,null,null,null,array(ObjectNormalizer::CIRCULAR_REFERENCE_HANDLER=>function ($object) {
    return (string)$object;
}));

Answer 2

you should use it ( circular_reference_handler ) as configuration key. For example,

serializer:
    circular_reference_handler: App\Service\YourHandlerService

I tried it in framework.yaml and it works.