Symfony：一对多双向关系

Question

这是我的实体 "Product" :

class Product
{
    /**
     * @var int
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /*
     * @ORM\OneToMany(targetEntity="ShopBundle\Entity\Offer", mappedBy="product", cascade={"persist", "remove", "merge"}, orphanRemoval=true)
     */
    private $offers;

    /*
     * Constructeur
     */
    public function __construct()
    {
       $this->offers = new \Doctrine\Common\Collections\ArrayCollection();
    }

    /**
     * Add offer
     * @param \ShopBundle\Entity\Offer $offer
     * @return Product
     */
    public function addOffer(\ShopBundle\Entity\Offer $offer)
    {
        $this->offers[] = $offer;
        return $this;
    }

    /**
     * Remove offer
     * @param \ShopBundle\Entity\Offer $offer
     */
    public function removeOffer(\ShopBundle\Entity\Offer $offer)
    {
        $this->offers->removeElement($offer);
    }

    /**
     * Get parameters
     * @return \Doctrine\Common\Collections\Collection
     */
    public function getOffers()
    {
        return $this->offers;
    }

    /**
     * Get id
     *
     * @return integer
     */
    public function getId()
    {
        return $this->id;
    }
}

而且，这是我的实体 "Offer" :

class Offer
{
    /**
     * @var int
     *
     * @ORM\Column(name="id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    private $id;

    /**
     * @ORM\ManyToOne(targetEntity="ShopBundle\Entity\Product", inversedBy="offers", cascade={"persist", "merge"})
     * @ORM\JoinColumn(name="product_id", referencedColumnName="id", nullable=false)
     */
    private $product;

    /**
     * Get id
     *
     * @return integer
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set product
     *
     * @param \ShopBundle\Entity\Product $product
     *
     * @return Offer
     */
    public function setProduct(\ShopBundle\Entity\Product $product)
    {
        $this->product = $product;

        return $this;
    }

    /**
     * Get product
     *
     * @return \ShopBundle\Entity\Product
     */
    public function getProduct()
    {
        return $this->product;
    }
}

什么时候，我在我的控制器中得到了一个对象 $product = $em->getRepository('ShopBundle:Product')->find($id);

然后，$product->getOffers() return null 但在数据库中没有 null。

请帮帮我...请...

Answer 1

在您的 Product 实体中，您缺少第二个 * 字符，该字符引入了包含 $offers:

映射信息的文档块

/*
 * @ORM\OneToMany(targetEntity="ShopBundle\Entity\Offer", mappedBy="product", cascade={"persist", "remove", "merge"}, orphanRemoval=true)
 */
private $offers;

因此，PHP 将这些行视为普通注释而不是文档块，这意味着 Doctrine 对它们一无所知。

把它改成这样：

class Product
{
    // ...

    /**
     * @ORM\OneToMany(targetEntity="ShopBundle\Entity\Offer", mappedBy="product", cascade={"persist", "remove", "merge"}, orphanRemoval=true)
     */
    private $offers;

    // ...
}

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