2

我有两个模型，产品和类别。每个产品都可以是具有weight属性的多个类别的一部分。这给出了三个表；product,category和product_category. 这是我的模型：

/** @Entity @Table(name="product") **/
class Product
{
    /** @Id @Column(type="integer") @GeneratedValue **/
    protected $id = null;

    /** @OneToMany(targetEntity="ProductCategory", mappedBy="product", orphanRemoval=true, cascade={"persist","remove"}) @var ProductCategory[] **/
    protected $productCategories = null;

    public function __construct ()
    {
        $this->productCategories = new ArrayCollection();
    }

    // Take an array of category_ids of which the product should be part of. The first category gets weight=1, next weight=2 etc.
    public function saveCategories ($category_ids)
    {
        $weight = 1;
        $this->productCategories = new ArrayCollection();
        foreach ($category_ids as $category_id)
            $this->productCategories[] = new ProductCategory($this->id, $category_id, $weight++);
    }
}


/** @Entity @Table(name="category") **/
class Category
{
    /** @Id @Column(type="integer") @GeneratedValue **/
    protected $id = null;

    /** @Column(type="string",length=200,nullable=false) @var string **/
    protected $title = null;

    /** @OneToMany(targetEntity="ProductCategory", mappedBy="category") @var ProductCategory[] **/
    protected $productCategories = null;

    public function __construct()
    {
        $this->productCategories = new ArrayCollection();
    }
}


/** @Entity @Table(name="product_category") **/
class ProductCategory
{
    /** @Id @Column(type="integer",nullable=false) **/
    protected $product_id = null;

    /** @Id @Column(type="integer",nullable=false) **/
    protected $attraction_id = null;

    /** @Column(type="integer",nullable=false) **/
    protected $weight = null;

    /** @ManyToOne(targetEntity="Product",inversedBy="productCategories") @JoinColumn(name="product_id",referencedColumnName="id",onDelete="CASCADE") @var Product **/
    protected $product;

    /** @ManyToOne(targetEntity="Category",inversedBy="productCategories") @JoinColumn(name="category_id",referencedColumnName="id",onDelete="CASCADE") @var Category **/
    protected $category;

    public function __construct ($product_id, $category_id, $weight)
    {
        $this->product_id = $product_id;
        $this->attraction_id = $attraction_id;
        $this->weight = $weight;
    }
}

问题是，当我尝试保存类别时，我收到一条错误消息，指出product_id不能为空 - MySQL 日志确认 Doctrine 尝试将一行插入product_category两者product_id并category_id设置为 0，尽管我在ProductCategory构造函数中设置了它们.

有什么建议我可能做错了吗？

4

1 回答 1

1

你这样做是不对的。在 Doctrine2 中，没有 product_id 和 category_id 这样的东西。您只处理产品和类别实体，列值由学说本身处理。

代替

....
foreach ($category_ids as $category_id)
    $this->productCategories[] = new ProductCategory($this->id, $category_id, $weight++);

你应该有类似的东西

public function saveCategories ($categories)
{
    foreach ($categories as $category)
        $this->productCategories[] = new ProductCategory($this, $category)

修复 ProductCategory 的构造函数以反映这些并删除 category_id 和 product_id 定义。

于 2012-11-26T11:49:32.943 回答