'Circular reference has been detected' error when serializing many-to-many-associated objects

symfony serialization

It looks like something wrong with config.You have to enable serialization groups annotation:

# app/config/config.ymlframework:# ...serializer:    enable_annotations: true

And proper use statement has to be present in ContactGroup entity class

use Symfony\Component\Serializer\Annotation\Groups;

symfony serialization

    $normalizers->setCircularReferenceHandler(function ($object) {        return $object->getId();    });

Just add it after you make the instance of your objectNormalizer ;

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