Form validation error response - field names not converted from camel case to underscore

[lopsided]

When I return my form errors like:

return View::create($form, 400);

The errors are returned like:

{"code":400,"message":"Validation Failed","errors":{"children":{"firstName":{"errors":["Your first name
 must not be empty."]},"lastName":{},"email":{}}}}

Where I was expecting firstName and lastName to come through as first_name and last_name.

All the rest of the serialization works fine (ie, returning objects, converting form posts etc). Just this.

My config (I'm using the FOSRestBundle):

fos_rest:
    param_fetcher_listener: force
    body_listener:
        array_normalizer: fos_rest.normalizer.camel_keys
    view:
        default_engine: json
        view_response_listener: force
        templating_formats:
            html: true
            twig: false
    routing_loader:
        default_format: json
    format_listener:
        rules:
            - { path: '^/', priorities: [ 'json' ], fallback_format: json, prefer_extension: false }
    serializer:
        serialize_null: true

jms_serializer:
    metadata:
        cache: ~
        directories:
            core:
                namespace_prefix: "MyProject\\Core"
                path: "@MyProjectApiBundle/Resources/config/serializer"

Apologies if this is a configuration problem.

I posted this here as the file that seems to be creating the response is JMS/Serializer/Handler/FormErrorHandler.php and I can't see if/where it is applying any naming strategy to the field names. (ie, line 145; $children[$child->getName()])

[goetas]

Sorry for the terribly long feedback loop. Probably you have already solved your issue, but just to answer you, the FormErrorHandler does not follow the naming strategies, since is a custom handler for symfony forms