如何通过非主键引用 Doctrine 2 中的多对一关联

How to reference many-to-one association in Doctrine 2 by a non-primary key

据我了解,Doctrine 需要多对一 关联以在一侧引用主键。 (参见 here or here

如何解决由 Doctrine 2 中的唯一键引用的多对一关联?

在下文中,我将展示到目前为止我所提出的内容以及 运行 对上述问题的看法。必须进行哪些更改才能使其在我的环境中工作?

就我而言:

项目具有 snapshotIdcid 等属性。 cid 表示内部项目编号。在某些更改中,将拍摄快照并使用唯一的 snapshotId 保存(包括关联的 table 中的所有相关条目 - 此处未显示)。具有空 (null) snapshotId 的条目是当前状态。

正在 ProjectHistory 中跟踪项目的更改。出于演示目的,该实体具有属性 functionmodifyDatemodifyUserId.

该项目与 ProjectHistory 具有一对多关联。 ProjectHistory 与 Project 的多对一关联。前者按预期工作,后者带来开头提到的错误。

<?php

namespace App\Entity;

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

/**
 * @ORM\Entity()
 * @ORM\Table(
 *     indexes={
 *         @ORM\Index(
 *             name="cid",
 *             columns={"cid"}
 *         ),
 *     },
 *     uniqueConstraints={
 *         @ORM\UniqueConstraint(
 *             name="unique_snapshot_per_project",
 *             columns={"snapshot_id", "cid"}
 *         ),
 *     },
 * )
 */
class Project
{
    /**
     * @ORM\Id()
     * @ORM\Column(type="guid")
     * @ORM\GeneratedValue(strategy="UUID")
     * @var string
     */
    private $id;

    /**
     * @ORM\Column(type="guid", unique=true, nullable=true)
     * @var string|null
     */
    private $snapshotId;

    /**
     * @ORM\Column()
     * @var string
     */
    private $cid;

    /**
     * @ORM\OneToMany(targetEntity="ProjectHistory", mappedBy="projectCid", cascade={"persist"})
     * @var Collection|ProjectHistory[]
     */
    private $projectHistories;

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

    public function toArray(): array
    {
        return [
            'id'               => $this->getId(),
            'snapshotId'       => $this->getSnapshotId(),
            'cid'              => $this->getCid(),
            'projectHistories' => $this->getProjectHistoriesAsArray(),
        ];
    }

    public function getProjectHistoriesAsArray(): array
    {
        $projectHistories = [];
        foreach ($this->getProjectHistories() as $projectHistory) {
            $projectHistories[] = $projectHistory->toArray();
        }

        return $projectHistories;
    }

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

    public function setId(string $id): void
    {
        $this->id = $id;
    }

    public function getSnapshotId(): ?string
    {
        return $this->snapshotId;
    }

    public function setSnapshotId(string $snapshotId): void
    {
        $this->snapshotId = $snapshotId;
    }

    public function getCid(): string
    {
        return $this->cid;
    }

    public function setCid(string $cid): void
    {
        $this->cid = $cid;
    }

    public function getProjectHistories(): Collection
    {
        return $this->projectHistories;
    }

    /**
     * @param ArrayCollection|ProjectHistory[] $projectHistories
     * @return Project
     */
    public function addProjectHistories(ArrayCollection $projectHistories): Project
    {
        foreach ($projectHistories as $projectHistory) {
            if (! $this->projectHistories->contains($projectHistory)) {
                $this->projectHistories->add($projectHistory);
                $projectHistory->setProject($this);
            }
        }

        return $this;
    }

    /**
     * @param ArrayCollection|ProjectHistory[] $projectHistories
     * @return Project
     */
    public function removeProjectHistories(ArrayCollection $projectHistories): Project
    {
        foreach ($projectHistories as $projectHistory) {
            if ($this->projectHistories->contains($projectHistory)) {
                $this->projectHistories->remove($projectHistory);
            }
        }

        return $this;
    }
}
<?php

namespace App\Entity;

use DateTime;
use DateTimeInterface;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity()
 */
class ProjectHistory
{
    /**
     * @ORM\Id()
     * @ORM\Column(type="guid")
     * @ORM\GeneratedValue(strategy="UUID")
     * @var string
     */
    private $id;

    /**
     * @ORM\Column()
     * @var string
     */
    private $function;

    /**
     * @ORM\Column(type="datetime")
     * @var Datetime
     */
    private $modifyDate;

    /**
     * @ORM\Column(type="guid")
     * @var string
     */
    private $modifyUserId;

    /**
     * @ORM\ManyToOne(targetEntity="Project", inversedBy="projectHistories")
     * @ORM\JoinColumn(name="project_cid", referencedColumnName="cid")
     * @var Project
     */
    private $project;

    public function toArray(): array
    {
        return [
            'id'           => $this->getId(),
            'projectCid'   => $this->getProjectCid(),
            'function'     => $this->getFunction(),
            'modifyDate'   => $this->getModifyDateAsString(),
            'modifyUserId' => $this->getModifyUserId(),
        ];
    }

    public function getModifyDateAsString(): string
    {
        if (null === $this->getModifyDate()) {
            return '';
        }

        return $this->getModifyDate()->format(DateTimeInterface::ATOM);
    }

    public function getProjectCid(): ?string
    {
        if (null !== $this->getProject()) {
            return $this->getProject()->getCid();
        }

        return null;
    }

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

    public function setId(string $id): void
    {
        $this->id = $id;
    }

    public function getFunction(): string
    {
        return $this->function;
    }

    public function setFunction($function): void
    {
        $this->function = $function;
    }

    public function getModifyDate(): DateTime
    {
        return $this->modifyDate;
    }

    public function setModifyDate(DateTime $modifyDate): void
    {
        $this->modifyDate = $modifyDate;
    }

    public function getModifyUserId(): string
    {
        return $this->modifyUserId;
    }

    public function setModifyUserId(string $modifyUserId): void
    {
        $this->modifyUserId = $modifyUserId;
    }

    public function getProject(): ?Project
    {
        return $this->project;
    }

    public function setProject(Project $project): void
    {
        $this->project = $project;
    }
}

非常感谢任何帮助。如果您需要更多信息,请告诉我。

通常如果你需要做这样的事情,我的意思是通过非主键引用,你的设计有问题。阅读您的问题时,我首先想到的是 Event Soursing. There is good implimentation of ES for PHP - prooph。不幸的是,将现有项目重构为 ES 并非易事,但也许它可以帮助您更好地理解历史变更和快照的概念。

按照目前的情况,我可以说Project不是做快照的目的。您可以修改模型并创建与 Project 相关的 ProjectSnapshot 实体,然后 ProjectHistory 将与 ProjectSnapshot 相关。此外,我不建议您在快照中存储任何关联(和外键),而是只保存相关实体的标识符。注意loggable extension,也许会有用。