class MovieType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options): void
    {
        $builder->add('director', EntityType::class, [
            'class' => MovieDirector::class,
           // query builder etc
        ]);

        $builder->add('name');
    }

    public function configureOptions(OptionsResolver $resolver): void
    {
        $resolver->setDefaults([
            'data_class' => Movie::class,
        ]);
    }
}

public function onKernelTerminate(PostResponseEvent $event)
{
    $this->em->clear();
}

public function editMovieAction(Movie $movie, Request $request): Response
{
    $em = $this->getDoctrine()->getManager();
    $form = $this->createForm(MovieType::class, $movie);

    $form->handleRequest($request);
    if ($form->isSubmitted() && $form->isValid()) {
        $em->flush();

        return $this->redirectToRoute('movie_detailed', ['id' => $movie->getId()]);
    }

    return $this->render('movies/form.html.twig', [
        'form' => $form->createView(),
        'all_movies' => $$this->getDoctrine()->getRepository(Movie::class)->findAll(),
    ]);
}