Symfony2 ObjectNormalizer denormalize callbacks

Can I use setCallbacks

on Symfony\Component\Serializer\Normalizer\ObjectNormalizer

, which is called when called Symfony\Component\Serializer\Serializer.deserialize()

to convert the normalized value back to an object?

I know the opposite is possible, in that the object can be normalized when called Symfony\Component\Serializer\Serializer.serialize()

. I just don't do reverse normalization.

An example of serialization for an object setCallbacks

converting Foo

to Id

:

    $encoder = new JsonEncoder();
    $normalizer = new ObjectNormalizer();
    $normalizer->setCallbacks(array(
        'foo' => function ($foo) {
            return $foo instanceof Foo
                ? $foo->getId()
                : null;
        },
    ));
    $serializer = new Serializer(array($normalizer), array($encoder));

    $json = $serializer->serialize($entity, 'json');

      

        
        
        
      

    

The opposite is what I would like to do:

$em = static::getEntityManager();

    $encoder = new JsonEncoder();
    $normalizer = new ObjectNormalizer();
    $normalizer->setCallbacks(array(
        'foo' => function ($foo) use($em) {
            return !is_null($foo)
                ? $em->getReference('\Entity\Foo', $foo)
                : null;
        },
    ));
    $serializer = new Serializer(array($normalizer), array($encoder));

    return $serializer->deserialize($entity, $classname, 'json');

      

        
        
        
      

    

The error I am getting:

Catchable fatal error: Argument 1 passed to \Entity\Bar::setFoo() must be an instance of \Entity\Foo, integer given

      

        
        
        
      

    

Or is there a preliminary step that can be done before deserialize

?