Doctrine ORM ManyToOne Inverse 不起作用

Question

我有一个双向多对一对多关系，只在一个方向上工作，有人可以帮忙吗？为了清晰起见，我试图将示例精简为最少的代码。

Question 实体可以有多个 Answer 实体。

问题实体

class CwEmployeeQuestion
{
    public function __construct()
    {
        $this->cw_employee_answers = new \Doctrine\Common\Collections\ArrayCollection();
    }

    /**
     * @ORM\Column(type="guid")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="UUID")
     */
    protected $id;

    /** 
     * @ORM\OneToMany(targetEntity="Fitchek\Entity\Corporate\CwEmployeeAnswer", mappedBy="cw_employee_question")
    */
    protected $cw_employee_answers;

    /**
     * Get CwEmployeeAnswer
     * 
     * @return \Doctrine\Common\Collections\Collection
    */
    public function getCwEmployeeAnswer()
    {
        return $this->cw_employee_answers;
    }
}

回答实体

class CwEmployeeAnswer
{
    /**
     * @ORM\Column(type="guid")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="UUID")
     */
    protected $id;

    /**
     * Many CwEmployeeAnswer have One CwEmployeeQuestion.
     * 
     * @var \Fitchek\Entity\Corporate\CwEmployeeQuestion $cw_employee_question
     * 
     * @ORM\ManyToOne(targetEntity="Fitchek\Entity\Corporate\CwEmployeeQuestion", inversedBy="cw_employee_answer")
     * @ORM\JoinColumn(name="cw_employee_question", referencedColumnName="id")
     */
    protected $cw_employee_question;

    /**
     * Set $cw_employee_question
     *
     * @param   \Fitchek\Entity\Corporate\CwEmployeeQuestion $cw_employee_question
     * @return  CwEmployeeAnswer
     */
    public function setCwEmployeeQuestion(?\Fitchek\Entity\Corporate\CwEmployeeQuestion $cw_employee_question = null): self
    {
        $this->cw_employee_question = $cw_employee_question;

        return $this;
    }

    /**
     * Get $cw_employee_question
     *
     * @return \Fitchek\Entity\Corporate\CwEmployeeQuestion
     */
    public function getCwEmployeeQuestion(): ?CwEmployeeQuestion
    {
        return $this->cw_employee_question;
    }

    /**
     *
     * {@inheritdoc}
     *
     * @param   JSON                $json, the request JSON to create a new CwEmployeeAnswer
     * @return  CwEmployeeAnswer    the newly created CwEmployeeAnswer
     */
    public function createFromData($json, $cw_employee_question = null)
    {
        $this->setCwEmployeeQuestion($cw_employee_question);

        return $this;
    }
}

当我尝试方向 answer->question 时，它工作正常，并返回给我一个答案列表，其中包含作为 JSON 一部分的相关问题。例如：

[
  { "id": 1
    "name": "answer 1",
    "question" : {
      "name": "question 1"
    }
  }
  ...
]

但是，当查询另一个方向以获取所有问题及其答案作为返回 JSON 的一部分时，问题数组返回为 null。例如：

[
  { "id": 1
    "name": "question 1",
    "answers": null
  }
  ...
]

当我想看到的是：

[
  { "id": 1
    "name": "question 1",
    "answers" : [
      {
        "name": "answer 1"
      },
     {
        "name": "answer 2"
      }
      ...
    ]
  }
  ...
]

Answer 1

好像没问题。可能只是一个错字。 尝试使用inversedBy="cw_employee_answers"（复数为$cw_employee_answers）而不是inversedBy="cw_employee_answer" 它应该可以工作。