FOSUser + FOSRest - Update User - rest

Question

I'm using Fosuser and Fosrest for a webservice.
I created GetUser to get List user and the registration to register an user and it work perfectly !
But, now I try to make the update user but i got a problem !
I copy the function from Fosuser controller
In My controller :
public function updatePostAction(Request $request,$id)
{
$user = $this->getUser();
if (!is_object($user) || !$user instanceof UserInterface) {
throw new AccessDeniedException('This user does not have access to this section.');
}
/** #var $dispatcher \Symfony\Component\EventDispatcher\EventDispatcherInterface */
$dispatcher = $this->get('event_dispatcher');
$event = new GetResponseUserEvent($user, $request);
$dispatcher->dispatch(FOSUserEvents::PROFILE_EDIT_INITIALIZE, $event);
if (null !== $event->getResponse()) {
return $event->getResponse();
}
/** #var $formFactory \FOS\UserBundle\Form\Factory\FactoryInterface */
$formFactory = $this->get('fos_user.profile.form.factory');
$form = $formFactory->createForm();
$form->setData($user);
$form->handleRequest($request);
if ($form->isValid()) {
/** #var $userManager \FOS\UserBundle\Model\UserManagerInterface */
$userManager = $this->get('fos_user.user_manager');
$event = new FormEvent($form, $request);
$dispatcher->dispatch(FOSUserEvents::PROFILE_EDIT_SUCCESS, $event);
$userManager->updateUser($user);
if (null === $response = $event->getResponse()) {
$url = $this->generateUrl('fos_user_profile_show');
$response = new RedirectResponse($url);
}
$dispatcher->dispatch(FOSUserEvents::PROFILE_EDIT_COMPLETED, new FilterUserResponseEvent($user, $request, $response));
return $response;
}
return $this->render('FOSUserBundle:Profile:edit.html.twig', array(
'form' => $form->createView()
));
}
it doesn't work ! anyone can help me ?
When i try to post :
{
"fos_user_profile_form": {
"username":"jacky"
}
}
it returns : https://gist.github.com/gaticho/34ae4fff5492fdecd48f
The database doesn't change :-(
My User entity :
<?php
namespace AppBundle\Entity;
use FOS\UserBundle\Model\User as BaseUser;
use Doctrine\ORM\Mapping as ORM;
/**
* #ORM\Entity
* #ORM\Table(name="user")
*/
class User extends BaseUser
{
/**
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
private $dateCreated;
/**
* #var DateTime
*
* #ORM\Column(name="date_modified", type="datetime", nullable=true)
*/
private $dateModified;
/**
* #var DateTime
*
* #ORM\Column(name="date_deleted", type="datetime", nullable=true)
*/
private $dateDeleted;
public function __construct()
{
parent::__construct();
}
}`
Thanks !