FOSRestBundle posting json data to a form not working

Since nobody replied, I am going to answer myself in this question.

First of all, sent JSON must start with form name, so instead:

{"firstName": "John", "lastName": "Doe", "emailAddress": "something@somewhere.com", "sex": "1"

must be:

{"user": {"firstName": "John", "lastName": "Doe", "emailAddress": "something@somewhere.com", "sex": "1"}}

In my case, form name was "user".

I have used CURL to test it:

curl -v -H "Accept: application/json" -H "Content-type: application/json" -XPOST -d "{\"user\":{\"firstName\":\"John\", \"emailAddress\": \"somewhere@somehow.com\", \"password\":\"verystrongmuchpower\"}}" http://localhost.software.com/app_dev.php/api/1.0/users

Since I am testing the API with CURL, a difference in response in bind and handleRequest is gone.

I will update this answer soon if I get more conclusions.

i solved it like this:

    $user = new User;    $form = $this->createForm(UserType::class, $user);    $view = View::create();    $form->submit($request->request->all());    if ($form->isValid()) {        $em = $this->getDoctrine()->getManager();        $em->persist($user);        $em->flush();        $view->setData($form->getData());    } else {        $view->setData($form);    }    return $this->handleView($view);

Don't forget to disable CSRF validation (https://symfony.com/doc/master/bundles/FOSRestBundle/2-the-view-layer.html#csrf-validation)

fos_rest:    disable_csrf_role: ROLE_API    #disable_csrf_role: IS_AUTHENTICATED_ANONYMOUSLY #just for testing

Then you get a nice output like this:

{"code": 400,"message": "Validation Failed","errors": {    "children": {        "name": {            "errors": [                "This value should not be blank."            ]        },        "role": {            "errors": [                "This value should not be blank."            ]        }    }  }}