无法确定访问类型

Question

我需要创建一个名为 Users 的主实体和另一个名为 Specialties 的主实体。 一个用户可以有很多专长。

有我的用户实体：

<?php

namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Security\Core\User\AdvancedUserInterface;
use Symfony\Component\Security\Core\User\UserInterface;
use Symfony\Component\Serializer\Annotation\Groups;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;

/**
 * @ORM\Entity(repositoryClass="App\Repository\UsersRepository")
 * @UniqueEntity(
 *     fields={"email"},
 *     errorPath="email",
 *     message="It appears you have already registered with this email."
 * )
 */
class Users implements UserInterface
{

    /**
     * Users constructor.
     */
    public function __construct()
    {
        $this->created_at = new \DateTime();
        $this->specialtyId = new ArrayCollection();
    }

    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     * @Groups({"public"})
     */
    private $id;

    //Other properties there...

    /**
     * @ORM\ManyToMany(targetEntity="App\Entity\Specialties", inversedBy="users")
     */
    private $specialtyId;

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

    /**
     * @return Collection|Specialties[]
     */
    public function getSpecialtyId(): Collection
    {
        return $this->specialtyId;
    }

    public function addSpecialtyId(Specialties $specialtyId): self
    {
        if (!$this->specialtyId->contains($specialtyId)) {
            $this->specialtyId[] = $specialtyId;
        }
        return $this;
    }

    public function removeSpecialtyId(Specialties $specialtyId): self
    {
        if ($this->specialtyId->contains($specialtyId)) {
            $this->specialtyId->removeElement($specialtyId);
        }
        return $this;
    }

}

有我的专业实体：

<?php

namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

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

    //Other properties there...

    /**
     * @ORM\ManyToMany(targetEntity="App\Entity\Users", mappedBy="specialtyId")
     */
    private $users;

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

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

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

        return $this;
    }

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

        return $this;
    }
}

当我尝试保存注册表时，出现以下异常：

**> 无法确定类中属性“specialtyId”的访问类型

“App\\Entity\\Users”：类“App\\Entity\\Users”中的属性“specialtyId”可以使用“addSpecialtyId()”、“removeSpecialtyId()”方法定义，但新值必须是数组或实例\\Traversable，给出了“App\\Entity\\Specialties”。**

创建一个名为：users_specialties 的新表，其中包含：users_id/specialties_id

Answer 1

在用户实体上试过这个，但仍然是同样的错误：

public function addSpecialtyId(Specialties $specialtyId): self
    {
        if (!$this->specialtyId->contains($specialtyId)) {
            $this->specialtyId[] = $specialtyId;
        }
        return $this;
    }

    public function removeSpecialtyId(Specialties $specialtyId): self
    {
        if ($this->specialtyId->contains($specialtyId)) {
            $this->specialtyId->removeElement($specialtyId);
        }
        return $this;
    }