Doctrine Event Listener用于添加/删除Many to Many关系

Question

我大量使用实体监听器进行日志记录,通常工作得很好并且将所有代码保留在控制器/服务之外.

我无法实现的一件事是记录添加到ManyToMany关系的项目.在这种情况下,我想记录从产品中添加/删除大小的时间

/**
 * @ORM\Entity
 * @ORM\EntityListeners({"EventListener\ProductListener"})
 * @ORM\Table(name="products")
 */
class Product
{
    // ...

    /**
     * @var ArrayCollection
     *
     * @ORM\ManyToMany(targetEntity="Size")
     * @ORM\JoinTable(name="productSizes",
     *      joinColumns={@ORM\JoinColumn(name="productId", referencedColumnName="productId")},
     *      inverseJoinColumns={@ORM\JoinColumn(name="sizeId", referencedColumnName="sizeId")}
     * )
     */
    protected $sizes;

    /**
     * @param Size $size
     * @return Product
     */
    public function addSize(Size $size)
    {
        $this->sizes[] = $size;
        return $this;
    }

    /**
     * @param Size $size
     */
    public function removeSize(Size $size)
    {
        $this->sizes->removeElement($size);
    }

    /**
     * @return ArrayCollection
     */
    public function getSizes()
    {
        return $this->sizes;
    }

    // ...
}

然后在实体监听器内部

class ProductListener
{
    // ...

    /**
     * @ORM\PostPersist
     */
    public function postPersistHandler(Product $product, LifecycleEventArgs $args)
    {
        $this->getLogger()->info("Created product {$product->getSku()}", [
            'productId' => $product->getId()
        ]);
    }

    /**
     * @ORM\PostUpdate
     */
    public function postUpdateHandler(Product $product, LifecycleEventArgs $args)
    {
        $context = $args->getEntityManager()->getUnitOfWork()->getEntityChangeSet($product);

        $context['productId'] = $product->getId();
        $this->getLogger()->info("Updated product", $context);
    }

    // ...
}

那么如何才能从工作单元中添加/删除颜色？我假设这在某处可用,但我找不到它.

Answer 1

在ProductListener中

 $product->getSizes() returns instance of Doctrine\ORMPersistentCollection. Then you can call 2 methods:

 - getDeleteDiff - returns removed items
 - getInsertDiff - returns added items