Doctrine manyToMany 返回 PersistentCollection 而不是 ArrayCollection
我正在使用 Symfony 3.1 和 Doctrine 2.5.
I'm working with Symfony 3.1 and Doctrine 2.5.
我像往常一样设置了 manyToMany 关系:
I setup a manyToMany relationship as I always do :
manyToMany:
placeServices:
targetEntity: AcmeMyBundleEntityPlaceService
joinTable:
name: place_place_service
joinColumns:
place_id:
referencedColumnName: id
inverseJoinColumns:
place_service_id:
referencedColumnName: id
并为我的实体添加方法
protected $placeServices;
...
public function __construct()
{
$this->placeServices = new ArrayCollection();
}
...
/**
* @return ArrayCollection
*/
public function getPlaceServices(): ArrayCollection
{
return $this->placeServices;
}
/**
* @param PlaceServiceInterface $placeService
* @return PlaceInterface
*/
public function addPlaceService(PlaceServiceInterface $placeService): PlaceInterface
{
if(!$this->placeServices->contains($placeService)) {
$this->placeServices->add($placeService);
}
return $this;
}
/**
* @param PlaceServiceInterface $placeService
* @return PlaceInterface
*/
public function removePlaceService(PlaceServiceInterface $placeService): PlaceInterface
{
if($this->placeServices->contains($placeService)) {
$this->placeServices->removeElement($placeService);
}
return $this;
}
问题是，当我加载我的实体时，Doctor 在 $this->placeServices 属性中放置了一个 PersistentCollection.这听起来不是一个大问题，除了当我构建一个表单来连接这两个实体时(一个简单的多个复选框，具有 symfony 表单类型)，当 $form->handleRequest() 被触发时，Doctrine 尝试注入新数据在我的实体中，如果 get/add/remove 方法未使用 ArrayCollection，则会抛出错误.
The thing is, when I load my entity, doctrine put a PersistentCollection in the $this->placeServices property. This does not sound like a big problem, except that when I build a form to connect those two entities (a simple multiple checkboxes with symfony form type), when $form->handleRequest() is triggered, Doctrine try to inject the new data in my entity, and throw an error if get/add/remove method are not using ArrayCollection.
我可以强制我的 getter/add/remove 方法将 PersistentCollection 转换为 ArrayCollection(使用 unwrap 方法)，但随后建立的关系不会持久化.
I can force my getter/add/remove methods to transforme the PersistentCollection to ArrayCollection (using unwrap method) but then the relations made are not persisted.
我找到了一种解决方法，如果我在关系上设置 fetch="EAGER"，则该属性将使用 ArrayCollection 进行初始化，并且该关系将保持不变.但我不确定这是一个好的解决方案.
I've found a workaround, if I set fetch="EAGER" on the relation the property is initialized with ArrayCollection, and the relation are persisted. But i'm not sure it's a good solution.
谢谢:)
推荐答案
只需使用 DoctrineCommonCollectionsCollection 接口而不是 ArrayCollection.ArrayCollection 和 PersistentCollection 实现了这个接口.
Just use DoctrineCommonCollectionsCollection interface instead of ArrayCollection. ArrayCollection and PersistentCollection implement this interface.
Doctrine 使用 PersistentCollection 来延迟加载实体.您说得对，使用 EAGER 并不总是一个好的解决方案 - 它可能会导致性能问题.
Doctrine uses PersistentCollection for lazy loading entities. You are right, using EAGER is not always a good solution - it can cause perfomance issues.
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