试图理解 Symfony ManyToMany 错误

Question

我正在努力了解 symfony 和学说，我正在尝试在用户 + 组之间创建多对多关系。我正在使用 "symfony/maker-bundle": "^1.13",，它允许我通过命令行生成实体。我生成了一个如下所示的用户实体：

/**
 * @ApiResource(
 *     normalizationContext={"groups"={"user:read"}},
 *     denormalizationContext={"groups"={"user:write"}},
 * )
 * @ORM\Entity(repositoryClass="App\Repository\UserRepository")
 */
class User implements UserInterface
{
    /**
     * @ORM\Id()
     * @ORM\GeneratedValue()
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=180, unique=true)
     * @Groups({"user:read", "user:write"})
     */
    private $email;

    /**
     * @ORM\Column(type="json")
     */
    private $roles = [];

    /**
     * @var string The hashed password
     * @ORM\Column(type="string")
     * @Groups({"user:write"})
     */
    private $password;

    /**
     * @ORM\Column(type="string", length=255)
     * @Groups({"user:read"})
     */
    private $uuid;

    /**
     * @ORM\ManyToMany(targetEntity="App\Entity\Group", inversedBy="users")
     * @Groups({"user:read", "user:write"})
     */
    private $groups;

    public function __construct()
    {
        $this->uuid = Uuid:: uuid4()->toString();
        $this->groups = new ArrayCollection();
    }

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

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

        return $this;
    }

    /**
     * @see UserInterface
     */
    public function getSalt()
    {
        // not needed when using the "bcrypt" algorithm in security.yaml
    }

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

    public function getUuid(): ?string
    {
        return $this->uuid;
    }

    public function setUuid(string $uuid): self
    {
        $this->uuid = $uuid;

        return $this;
    }

    /**
     * @return Collection|Group[]
     */
    public function getGroups(): Collection
    {
        return $this->groups;
    }

    public function addGroup(Group $group): self
    {
        if (!$this->groups->contains($group)) {
            $this->groups[] = $group;
        }

        return $this;
    }

    public function removeGroup(Group $group): self
    {
        if ($this->groups->contains($group)) {
            $this->groups->removeElement($group);
        }

        return $this;
    }
}

我还生成了您可以在下面看到的组实体：

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

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

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

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

    public function __construct()
    {
        $this->uuid = Uuid::uuid4()->toString();
        $this->users = new ArrayCollection();
    }

    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;
    }

    public function getUuid(): ?string
    {
        return $this->uuid;
    }

    public function setUuid(string $uuid): self
    {
        $this->uuid = $uuid;

        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;
            $user->addGroup($this);
        }

        return $this;
    }

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

        return $this;
    }
}

我也在尝试使用 ApiPlatform 为我自动生成端点以创建用户、组等。现在，当我尝试创建新用户时，出现以下错误。

An exception occurred while executing 'SELECT t0.id AS id_1, t0.name AS name_2, t0.uuid AS uuid_3 FROM group t0 INNER JOIN user_group ON t0.id = user_group.group_id WHERE user_group.user_id = ?' with params [6]:

SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'group t0 INNER JOIN user_group ON t0.id = user_group.group_id WHERE user_group.u' at line 1

我想知道的是： 1）为什么我会收到这个错误？ 2) 我该如何解决？

检查我的数据库我可以看到用户记录已创建。我最初的想法是，当 ApiPlatform 尝试 return 新创建的用户对象时，它试图找到关联的组数据，但为什么它会失败并出现 500 错误，而不是只给我一个空白数组或其他东西？此时数据库中有 0 个组，这是导致我的错误的原因吗？

Answer 1

我不确定，但看起来你正在使用 MariaDB，你是否为它配置了 doctrine？

doctrine:
    dbal:
        server_version: 'mariadb-10.2.12'  # set here your actual DB version

可能会解决您的问题

Answer 2

可能group是Maria中的保留字（我相信是）

添加一个 @ORM\Table(name="groups") 然后再试一次。

干杯！

试图理解 Symfony ManyToMany 错误

Trying to understand Symfony ManyToMany error

php

symfony

doctrine-orm