jms_serializer:
metadata:
    auto_detection: true
    directories:
        FOSUB:
            namespace_prefix: "FOSUserBundle"
            path: "@RSBackendBundle/resources/config/serializer/FOSUB"

FOSUserBundleModelUser:
exclusion_policy: ALL
properties:
    password:
        expose: false
    id:
        expose: true

$response = $this->container->get('jms_serializer')->serialize($result, 'json');

return new Response($response);