SF register + login

RegisterController.php

<?php

namespace App\Controller;

use App\Entity\User;
use App\Form\RegisterType;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\Routing\Annotation\Route;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Symfony\Component\Security\Core\Authentication\Token\UsernamePasswordToken;
use Symfony\Component\Security\Core\Encoder\UserPasswordEncoderInterface;
use Symfony\Component\Security\Http\Authentication\AuthenticationUtils;

/**
 * Class RegisterController
 * @package App\Controller
 *
 * @Route("/register", name="register_")
 */
class RegisterController extends Controller
{
    /**
     * @Route("/", name="connect")
     */
    public function connect(
        Request $request,
        EntityManagerInterface $entityManager,
        UserPasswordEncoderInterface $passwordEncoder,
        TokenStorageInterface $tokenStorage,
        SessionInterface $session
    ) {
        $user = new User();
        $form = $this->createForm(RegisterType::class, $user);

        $form->handleRequest($request);

        if ($form->isSubmitted() && $form->isValid()) {
            $password = $passwordEncoder->encodePassword($user, $user->getPassword());
            $user->setPassword($password);

            $entityManager->persist($user);
            $entityManager->flush();

            // START
            // On connecte l'utilisateur dans la foulée
            $token = new UsernamePasswordToken(
                $user,
                $password,
                'main',
                $user->getRoles()
            );
            $tokenStorage->setToken($token);
            $session->set('_security_login', serialize($token));
            // END


            $this->addFlash('success', 'Bienvenue '.$user->getUsername());

            return $this->redirectToRoute('idea_list');
        }

        return $this->render(
            'register/connect.html.twig',
            [
                'form' => $form->createView(),
            ]
        );
    }
}