Symfony EntityType表单返回字符串而不是对象

我有一个与另一个实体角色有多对多关系的用户实体

我有一个表单，它允许我创建一个新用户，为此，我为许多关系“角色”使用EntityType

这是我的表格

$builder
            ->add('username',null,['label' => 'Email'])
            ->add('password',null,['label'=>'Password'])
            ->add('roles',EntityType::class, [
                'multiple' => true,
                'class' => Role::class,
                'choice_label' => 'role_name',
            ])
        ;

一切正常，但当我提交表单时，出现以下错误：

属性路径“角色”处给定的类型应为“App\Entity\Role”、“string”的参数

编辑：

这是我的用户实体：

<?php

namespace App\Entity;

use App\Repository\UserRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Security\Core\User\UserInterface;

/**
 * @ORM\Entity(repositoryClass=UserRepository::class)
 */
class User implements UserInterface
{
    /**
     * @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\ManyToMany(targetEntity=Role::class, inversedBy="users")
     */
    private $roles;

    public function __construct()
    {
        $this->roles = new ArrayCollection();
    }


    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 getRoles()
    {
        return ['ROLE_ADMIN'];
    }

    public function getSalt()
    {
        return null;
    }

    public function eraseCredentials()
    {

    }


    public function addRole(Role $role): self
    {
        if (!$this->roles->contains($role)) {
            $this->roles[] = $role;
            $role->addUser($this);
        }

        return $this;
    }

    public function removeRole(Role $role): self
    {
        if ($this->roles->contains($role)) {
            $this->roles->removeElement($role);
            $role->removeUser($this);
        }

        return $this;
    }


}

<?php

namespace App\Entity;

use App\Repository\RoleRepository;
use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity(repositoryClass=RoleRepository::class)
 */
class Role
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    private $id;

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

    /**
     * @ORM\ManyToMany(targetEntity=User::class, mappedBy="roles")
     */
    private $users;

    public function __construct()
    {
        $this->users = new ArrayCollection();
    }

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

    public function getRoleName(): ?string
    {
        return $this->role_name;
    }

    public function setRoleName(string $role_name): self
    {
        $this->role_name = $role_name;

        return $this;
    }

    /**
     * @return Collection|User[]
     */
    public function getUsers(): Collection
    {
        return $this->users;
    }

    public function addUser(User $user): self
    {
        if (!$this->users->contains($user)) {
            $this->users[] = $user;
        }

        return $this;
    }

    public function removeUser(User $user): self
    {
        if ($this->users->contains($user)) {
            $this->users->removeElement($user);
        }

        return $this;
    }
}

---

我想问题就在这里

 public function getRoles()
    {
        return ['ROLE_ADMIN'];
    }

您应该返回数组或角色实体，而不是字符串，它应该是这样的

 public function getRoles()
    {
        return $this->roles;
    }

我想问题就在这里

 public function getRoles()
    {
        return ['ROLE_ADMIN'];
    }

您应该返回数组或角色实体，而不是字符串，它应该是这样的

 public function getRoles()
    {
        return $this->roles;
    }

如果我在用户实体中使用ArrayCollection怎么办

/**
 * @var Collection|Role[]
 * @ORM\ManyToMany(targetEntity="App\Entity\Role")
 * @ORM\JoinTable(
 *     name="user_roles",
 *     joinColumns={@ORM\JoinColumn(name="user_id", referencedColumnName="id")},
 *     inverseJoinColumns={@ORM\JoinColumn(name="role_id", referencedColumnName="id")}
 * )
 */
private $roles;

public function __construct()
{
    $this->roles = new ArrayCollection();
}

public function getRoles()
{
    return $this->roles;
}

如果我在用户实体中使用ArrayCollection怎么办

/**
 * @var Collection|Role[]
 * @ORM\ManyToMany(targetEntity="App\Entity\Role")
 * @ORM\JoinTable(
 *     name="user_roles",
 *     joinColumns={@ORM\JoinColumn(name="user_id", referencedColumnName="id")},
 *     inverseJoinColumns={@ORM\JoinColumn(name="role_id", referencedColumnName="id")}
 * )
 */
private $roles;

public function __construct()
{
    $this->roles = new ArrayCollection();
}

public function getRoles()
{
    return $this->roles;
}

你能用角色的一部分显示用户实体吗？当然，我编辑了问题。你能用角色的一部分显示用户实体吗？当然，我编辑了问题。非常感谢！愚蠢的错误，我感谢你的努力非常感谢！愚蠢的错误，我感谢你的努力