Problèmes forms

Bonjour,

Voilà j'essaie désepérement de faire fonctionner un formulaire sous Symfony 4. Mais voilà quoi que je fasse je n'arrive pas à renvoyer à mon controller les datas de mon formulaire.

Voilà ce que j'ai fais et les fichiers que j'ai créer pour

• Un fichier entity User.php :

<?php

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass="App\Repository\UserRepository")
 */
class User
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $username;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $password;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $mail;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $firstName;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $LastName;

    public function getId(): ?int
    {
        return $this->id;
    }

    public function getUsername(): ?string
    {
        return $this->username;
    }

    public function setUsername(string $username): self
    {
        $this->username = $username;

        return $this;
    }

    public function getPassword(): ?string
    {
        return $this->password;
    }

    public function setPassword(string $password): self
    {
        $this->password = $password;

        return $this;
    }

    public function getMail(): ?string
    {
        return $this->mail;
    }

    public function setMail(string $mail): self
    {
        $this->mail = $mail;

        return $this;
    }

    public function getFirstName(): ?string
    {
        return $this->firstName;
    }

    public function setFirstName(string $firstName): self
    {
        $this->firstName = $firstName;

        return $this;
    }

    public function getLastName(): ?string
    {
        return $this->LastName;
    }

    public function setLastName(string $LastName): self
    {
        $this->LastName = $LastName;

        return $this;
    }
}

• Un fichier UserType.php :

  
  <?php

namespace App\Form;

use App\Entity\User;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\TextType;

class UserType extends AbstractType
{
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('username', TextType::class, [
'invalid_message' => 'Usermname problems',
])
->add('password', TextType::class, [
'invalid_message' => 'Password problems',
])
->add('mail', TextType::class, [
'invalid_message' => 'Mail problems',
])
->add('firstName', TextType::class, [
'invalid_message' => 'FirstName problems',
])
->add('LastName', TextType::class, [
'invalid_message' => 'LastName problems',
])
;
}

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

}

- Un controller HomeController.php :

<?php

namespace App\Controller;

use App\Entity\User;
use App\Form\UserType;
use Doctrine\Common\Persistence\ObjectManager;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Annotation\Route;

class HomeController extends AbstractController
{
/**

• @Route("/", name="home")
  */
  public function index()
  {
  return $this->render('home/index.html.twig', [
  'controller_name' => 'HomeController',
  ]);
  }

  /**

• @Route("/user/create", name="create")
  */
  public function create(Request $request, ObjectManager $manager)
  {
  $user = new User();
  $form = $this->createForm(UserType::class, $user);
  $form->handleRequest($request);
  $user = $form->getData();
  if ($form->isSubmitted()){
  echo "Dans le isSubmitted";

       if ($form->isValid()) {
           echo "Dans le isvalid";
  
          // $entityManager->persist($user);
          // $entityManager->flush();
  
          // return $this->redirectToRoute('/');
       }
  }
  
  return $this->render('home/index.html.twig', [
      'form' => $form->createView(),
      'user' => $user,
  ]);

  }
  }

- Une vue index.html.twig : 

{% extends 'base.html.twig' %}

{% block title %}Hello HomeController!{% endblock %}

{% block body %}

{%if form is defined %}
    {{form_start(form)}}
        {{form_row(form.username)}}
        {{form_row(form.password)}}
        {{form_row(form.mail)}}
        {{form_row(form.firstName)}}
        {{form_row(form.LastName)}}
        <button type="submit">Envoyer</button>
    {{form_end(form)}}
{% endif %}

{%if user is defined %}
    {{dump(user)}}
{% endif %}

{% endblock %}

Si je mets juste un {{form_widget(form)}}, lors de la validation de mon formulaire je récupère une erreur de type => "The uploaded file was too large. Please try to upload a smaller file". Déjà je comprend pas pourquoi ça fait ceci. 

Ensuite voilà ce que je récupère niveau data : 

User^ {#437 ▼
-id: null
-username: null
-password: null
-mail: null
-firstName: null
-LastName: null
}

Si certaine pouvez éclairer ma lanterne car la je séche. 

Merci pour votre aide.