Hide a field according to its role Symfony 3 - symfony

Question

First sorry for my english because is not great!
So I want to hide a field according to it's role because if I make with Twig the field to display on the bottom form
My code for understand, this's my LinkType :
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('title')
->add('link')
->add('description')
// this field to hidden according the role
->add('published', CheckboxType::class);
}
/**
* {#inheritdoc}
*/
public function configureOptions(OptionsResolver $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'AppBundle\Entity\Link'
));
}
/**
* {#inheritdoc}
*/
public function getBlockPrefix()
{
return 'appbundle_link';
}
a part of Controler:
public function newAction(Request $request)
{
$em = $this->getDoctrine()->getManager();
$categories = $em->getRepository('AppBundle:Category')->findAll();
$subCategories = $em->getRepository('AppBundle:SubCategory')->findAll();
$gestionCategorie = $this->container->get('app.categorie');
$link = new Link();
$repository = $this
->getDoctrine()
->getManager()
->getRepository('AppBundle:Link');
$category = $repository->findCategory();
$subCategory = $repository->findSubCategory();
$form = $this
->get('form.factory')
->create('AppBundle\Form\LinkType', $link)
->add('categories', ChoiceType::class, array(
// on inverse les clés et valeurs
'choices' => array_flip($category),
'label' => "Catégorie",
'attr' => ['class' => 'form-control'],
))
->add('sousCategories', ChoiceType::class, array(
// on inverse les clés et valeurs
'choices' => array_flip($subCategory),
'label' => "Sous-catégorie",
'attr' => ['class' => 'form-control'],
));
$form->handleRequest($request);
if ($form->isSubmitted() && $form->isValid()) {
If you have other questions, don't hesitate

Answer 1

If you want to do this in the controller, first remove your field in your form class, then add:
$user = $this->getUser();
if (in_array('MY_ROLE_NAME', $user->getRoles())) {
$builder->add('published', CheckboxType::class);
}
A better and cleaner approach is using a form as a service and injecting token storage service into it:
// services.yml
AppBundle\Form\:
resource: '../../src/AppBundle/Form'
public: true
autowire: true
// Form type class
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
//...
private $tokenStorage;
public function __construct(TokenStorageInterface $tokenStorage)
{
$this->tokenStorage = $tokenStorage;
}
public function buildForm(FormBuilderInterface $builder, array $options)
{
$user = $this->tokenStorage->getToken()->getUser();
$builder
->add('title')
->add('link')
->add('description');
if (in_array('MY_ROLE_NAME', $user->getRoles())) {
$builder->add('published', CheckboxType::class);
}
}