[4.x] formulaire sur une table sans relation

Bonjour,

Category.php

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<?php
 
namespace App\Entity;
 
use App\Repository\CategoryRepository;
use Doctrine\ORM\Mapping as ORM;
 
/**
 * @ORM\Entity(repositoryClass=CategoryRepository::class)
 */
class Category
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;
 
    /**
     * @ORM\Column(type="string", length=255)
     */
    private $name;
 
    public function getId(): ?int
    {
        return $this->id;
    }
 
    public function getName(): ?string
    {
        return $this->name;
    }
 
    public function setName(string $name): self
    {
        $this->name = $name;
 
        return $this;
    }
}

CategoryType

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<?php
 
namespace App\Form;
 
use App\Entity\Category;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
 
class CategoryType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', [ 'class' => Category::class,  ])   ;
    }
 
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => Category::class,
        ]);
    }
}

Form2Type

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class Form2Type extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {         
        $builder->add('categories', CollectionType::class, [
            'entry_type' => CategoryType::class,
            'allow_add' => false,
            'allow_delete' => false,
 
        ]);

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    {{ form_start(form2) }}
    {{ form_end(form2) }}   
 
......
......
        $categories = $entityManager->getRepository('App:Category')->findAll();
        $form2 = $this->createForm(Form2Type::class, $categories);

j'ai 3 categories en base de données donc je voudrais avoir les 3 champs à éditer sur l'écran mais j'ai rien qui s'affiche ! aucune erreur