键为“0、1、2”的数组的键“角色”不存在

Question

这是实体文件：

<?php

namespace App\Entity;

use App\Repository\UserRepository;
use Doctrine\DBAL\Types\Types;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
use Symfony\Component\Security\Core\User\PasswordAuthenticatedUserInterface;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Validator\Constraints as Assert;

#[ORM\Entity(repositoryClass: UserRepository::class)]
#[UniqueEntity(fields: ['email'], message: 'There is already an account with this email')]
class User implements UserInterface, PasswordAuthenticatedUserInterface
{
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    private ?int $id = null;

    #[ORM\Column(length: 180, unique: true)]
    #[Assert\Email(message:"the email '{{ value }}' is required")]
    private ?string $email = null;

    #[ORM\Column]
    private array $roles = [];

    /**
     * @var string The hashed password
     */
    #[ORM\Column]
    private ?string $password = null;

    #[ORM\Column(length: 255)]
    public ?string $full_name = null;

    #[ORM\Column(type: Types::DATE_MUTABLE)]
    public ?\DateTimeInterface $date_naiss = null;





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

    public function getEmail(): ?string
    {
        return $this->email;
    }

    public function setEmail(string $email): self
    {
        $this->email = $email;

        return $this;
    }

    /**
     * A visual identifier that represents this user.
     *
     * @see UserInterface
     */
    public function getUserIdentifier(): string
    {
        return (string) $this->email;
    }

    /**
     * @deprecated since Symfony 5.3, use getUserIdentifier instead
     */
    public function getUsername(): string
    {
        return (string) $this->email;
    }

    /**
     * @see UserInterface
     */
    public function getRoles(): array
    {
        $roles = $this->roles;
        // guarantee every user at least has ROLE_USER
        $roles[] = 'ROLE_USER';

        return array_unique($roles);
    }

    public function setRoles(array $roles): self
    {
        $this->roles = $roles;

        return $this;
    }

    /**
     * @see PasswordAuthenticatedUserInterface
     */
    public function getPassword(): string
    {
        return $this->password;
    }

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

        return $this;
    }

    /**
     * Returning a salt is only needed, if you are not using a modern
     * hashing algorithm (e.g. bcrypt or sodium) in your security.yaml.
     *
     * @see UserInterface
     */
    public function getSalt(): ?string
    {
        return null;
    }

    /**
     * @see UserInterface
     */
    public function eraseCredentials()
    {
        // If you store any temporary, sensitive data on the user, clear it here
        // $this->plainPassword = null;
    }

    public function getFullName(): ?string
    {
        return $this->full_name;
    }

    public function setFullName(string $full_name): self
    {
        $this->full_name = $full_name;

        return $this;
    }

    public function getDateNaiss(): ?\DateTimeInterface
    {
        return $this->date_naiss;
    }

    public function setDateNaiss(\DateTimeInterface $date_naiss): self
    {
        $this->date_naiss = $date_naiss;

        return $this;
    }



    

}

这是树枝文件（我删除了模板代码，因为它太长了，无法发布）：

{% extends 'back.html.twig' %}
{% block body %}
<tr>
    <th>Id</th>
    <th>Full Name</th>
    <th>Email</th>
    <th>Date of Birth</th>
    <th></th>
    <th>Action<th>
  </tr>
  {% for i in user %}
    <tr>
      <td>{{i.id}}</td>
      <td>{{i.full_name}}</td>
      <td>{{i.email}}</td>
      <td>{{i.date_naiss | date('Y-m-d') }}</td>
      <td>
                       {% for role in user.roles %}
                            {% if role == "ROLE_USER" %}
                                Utilisateur
                            {% elseif role == "ROLE_EDITOR" %}
                                Editeur
                            {% elseif role == "ROLE_ADMIN" %}
                                Administrateur
                            {% endif %}
                        {% endfor %}
                    </td>
            <td><a href="{{ path('user_delete', {'id': i.Id}) }}">Delete</a> 
          <a href="{{ path('user_update', {'id': i.Id}) }}">Update</a></td>

    </tr>
  {% endfor %}


{% endblock %}

这是我在控制器中使用的列表函数：

#[Route('admin/list', name: 'user_list')]
    public function userlist(UserRepository $user): Response
    {
        
        return $this->render('admin/list.html.twig', [
            'user' => $user->findall()
        ]);
    }

我在 symfony 5 中使用预定义的实体 User 和角色数组，每当我尝试运行路由“/admin/list”时，它都会显示上面的错误，即使角色数组是在实体文件中定义的。