Doctrine OrphanRemoving=true删除所有相关实体

我对两个实体之间的关系有一个奇怪的问题： 一个Joboffer可以有多个JobOfferLocation，而多个JobOfferLocation只能有一个Joboffer：

class Joboffer
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     * @ORM\Column(name="id_joboffer", type="integer", length=255, nullable=false)
     * @Groups({"api_read", "api_write"})
     */
    protected $id;
/**

     *
     * @ORM\OneToMany(targetEntity="AppBundle\Entity\Joboffer\JobofferLocation", mappedBy="joboffer",  orphanRemoval=true, cascade={"persist"})
     * @Groups({"api_read", "api_write"})
     * @var ArrayCollection
     */
    protected $jobofferLocations;


....
/**
     * @param JobofferLocation $jobofferLocation
     */
    public function addJobofferLocation(JobofferLocation $jobofferLocation)
    {
        if ($this->jobofferLocations->contains($jobofferLocation)) {
            return;
        }
        $this->jobofferLocations->add($jobofferLocation);
        $jobofferLocation->setJoboffer($this);
    }

jobofferlocationclass：

class JobofferLocation
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     * @ORM\Column(name="id_joboffer_location", type="integer", length=255, nullable=false)
     * @Groups({"api_read"})
     */
    protected $id;

/**
     * @return mixed
     */
    public function getJoboffer()
    {
        return $this->joboffer;
    }

    /**
     * @param mixed $joboffer
     */
    public function setJoboffer($joboffer)
    {
        $this->joboffer = $joboffer;
    }

在更新时，我遇到了以下问题： 当我使用“orphanRemoving=true”时，它会删除所有jobofferlocation实体；当我不使用它时，但使用“cascade=remove”时，它不会删除不在关系中的实体。 那么，有没有办法更新所有关系？（删除不再需要的，添加新的和更新现有的。）

我找到了一个答案：

首先，需要addJObofferLocation和removeJobofferLocation方法，并且必须将OrphanRemoving设置为true。 诀窍似乎在于添加正确（而不是双重）的位置

  class Joboffer
  {
     ...       

     /**
     * @ORM\OneToMany(targetEntity="AppBundle\Entity\Joboffer\JobofferLocation", mappedBy="joboffer", orphanRemoval=true,cascade={"persist"})
     * @Groups({"api_read", "api_write"})
     * @var ArrayCollection
     */
    protected $jobofferLocations;
   /**
     * @param JobofferLocation $jobofferLocation
     */
    public function addJobofferLocation(JobofferLocation $jobofferLocation)
    {

    if ($this->jobofferLocations->contains($jobofferLocation)) {
        return;
    }

    /** @var JobofferLocation $location */
    foreach ($this->jobofferLocations as $location){

        //check if this location exists
        // it seems we need this, because of the API plattform bundle
        if ($location->getIdLocation() == $jobofferLocation->getIdLocation()){
            // if it exists, just copy the new jobofferlocation settings

            return;
        }
    }
    $jobofferLocation->setJoboffer($this);
    $this->jobofferLocations->add($jobofferLocation);

}

public function removeJobOfferLocation(JobofferLocation $jobofferLocation)
{
    if (!$this->jobofferLocations->contains($jobofferLocation)) {
        return;
    }
    $this->jobofferLocations->removeElement($jobofferLocation);
    $jobofferLocation->removeJobOffer();
}