Doctrine one-to-many UNIDIRECTIONAL find on owning side

Question

问题定义

所以鉴于 this part 的 Doctrine 文档（以及许多其他关于双向关联和持久性问题的文章），我有一个单向的一对多关联。它介于 Club 和 Staff 成员之间。从领域逻辑来看，Club 应该 拥有 Staff。例如，如果我使用文档存储，Staff 将是 Club 的成员。在 99.9% 的域案例中，我有一个 club 并想要一份其员工列表。

但是，我在 Doctrine 中实现这个想法时遇到了麻烦。因为在 Doctrine 中，ONE-TO-MANY 关系只有相反的一面。所以即使在概念上下面的实体定义是错误的，但我不知道更好。

实体代码

<?php

class Club
{
    /**
     * @ORM\Id
     * @ORM\Column(type="uuid", unique=true)
     * @ORM\GeneratedValue(strategy="CUSTOM")
     * @ORM\CustomIdGenerator(class="Ramsey\Uuid\Doctrine\UuidGenerator")
     */
    public ?UuidInterface $id;

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

    /**
     * @ORM\OneToMany(targetEntity="Staff", mappedBy="club")
     */
    public Collection $staff;

    public function __construct(string $name)
    {
        $this->id       = Uuid::uuid4();
        $this->name     = $name;
        $this->staff    = new ArrayCollection();
    }

    public function addStaff(Staff $staff): void
    {
        $this->staff->add($staff);
    }

}

class Staff
{
    public const ROLE_OWNER = 'owner';

    /**
     * @ORM\Id
     * @ORM\Column(type="uuid", unique=true)
     * @ORM\GeneratedValue(strategy="CUSTOM")
     * @ORM\CustomIdGenerator(class="Ramsey\Uuid\Doctrine\UuidGenerator")
     */
    public ?UuidInterface $id;

    /**
     * @ORM\Column(type="string", name="user_id")
     */
    public string $userId;

    /**
     * @ORM\Column(type="string", name="role")
     */
    public string $role;

    public function __construct(string $userId, string $role)
    {
        $this->id     = Uuid::uuid4();
        $this->userId = $userId;
        $this->role   = $role;
    }
}

但真正的问题来了。我有一个用例，我想在其中为合适的员工找到俱乐部。这是一个 (ONE-)MANY-ONE 问题，需要注意的是第一个 one 不是另一个 Doctrine 实体，而是 Staff 实体的 userId .

所以我尝试了几种方法来获得 Club 个给定的实体 userId:

尝试失败

<?php
   // 1. Naive solution, just try to use the `ObjectRepository`
   // Will cause: You cannot search for the association field 'Club#staff', because it is the inverse side of an association. Find methods only work on owning side associations.
$staffers = $this->em->getRepository(Staff::class)->findBy(['userId' => $ownerId]);
$clubs = $this->em->getRepository(Club::class)->findBy(['staff' => $staffers]);

   // 2. Use `QueryBuilder` naively
   // Will cause: [Semantical Error] line 0, col 131 near 'staff = s.id': Error: Invalid PathExpression. StateFieldPathExpression or SingleValuedAssociationField expected
         $qb = $this->em->createQueryBuilder();
         $query = $qb->select('c')
         ->from(Club::class, 'c')
         ->join(Staff::class, 's', Join::WITH, 'c.staff = s.id')
         ->where('s.userId = :id')
         ->setParameter('id', $ownerId)
         ->getQuery();

    // 3. Use `QueryBuilder` with knowledge if actual DB columns
    // Will cause: [Semantical Error] line 0, col 138 near 'club_id WHERE': Error: Class Staff has no field or association named club_id
         $qb = $this->em->createQueryBuilder();
         $query = $qb->select('c')
         ->from(Club::class, 'c')
         ->join(Staff::class, 's', Join::WITH, 'c.id = s.club_id')
         ->where('s.userId = :id')
         ->setParameter('id', $ownerId)
         ->getQuery();

    // 4. Create query directly
    // Will cause: [Semantical Error] line 0, col 125 near 'staff = s.id': Error: Invalid PathExpression. StateFieldPathExpression or SingleValuedAssociationField expected
                $query = $this->em->createQuery('SELECT c FROM ' . Club::class . ' c JOIN ' . Staff::class . ' s WITH c.staff = s.id WHERE s.userId = :id')->setParameter('id', $ownerId);

我在寻找什么？

• Club和Staff之间的单向关联，让我不用担心持久化、性能、不一致性等问题。只是双向关联的所有问题。
• 或者：
  • 可能对 entities/associations
  进行返工
  • 一种检索 Club 实体的方法，给定 staff.userId

Answer 1

一个有效的解决方案，但我无法解释为什么这个有效而其他的无效。

<?php
$this->em->createQueryBuilder()
            ->select('c')
            ->from(Club::class, 'c')
            ->innerJoin(Staff::class, 's')
            ->where('s.userId = :owner')
            ->setParameter('owner', $ownerId)
            ->getQuery()
            ->getResult();