serialization with jms in symfony - symfony

Question

I have a User entity that contains address. I will save address as a json in my database. After form validation, I have to manually serialize address before persisting data. Is there anyway to avoid doing it like that ? Is it possible to call serialize event when doctrine is persisting data ?
class User{
/**
* #ORM\Column(name="username", type="string", length=30)
**/
private $username;
/**
* #ORM\Column(name="address", type="json")
**/
private $address;
}
class Address{
private $postalcode;
private $street;
}
// Inside my controller
class UserController extends Controller{
/**
* #Rest\View(StatusCode = Response::HTTP_CREATED)
*
* #Rest\Post(
* path = "/user",
* name = "user_create"
* )
*/
public function createAction(){
$user = new User();
$form = $this->createForm(UserType::class, $user);
$form->submit($request->request->all());
if ($form->isValid())
{
$em = $this->getDoctrine()->getManager();
$user->setAddress($this->get('jms_serializer')->serialize($user->getAddress(), 'json'));
$em->persist($user);
$em->flush();
return $this->view($user, Response::HTTP_CREATED);
}
return $form;
}
}

Answer 1

Doctrine failed to make it json because address property was private (PHP json_encode returning empty sctructure). Making it public resolve the problem.
When defining type as json, doctrine will use php's json encoding functions: https://www.doctrine-project.org/projects/doctrine-dbal/en/latest/reference/types.html#json-array
Thanks