为什么我的 Laravel hasManyThrough 不起作用？

Question

我有一个这样的表结构：

order_lines

• order_id
• product_sku
• 价格

location_products

• product_sku
• location_id

地点

• 身份证
• 姓名

在我的OrderLine 模型中，我有一个hasManyThrough 来通过productLocations 表获取位置。其结构如下：

class OrderLine extends Pivot
{
    use HasFactory;

    /**
     * @var bool
     */
    public $timestamps = false;

    public function locations(): HasManyThrough
    {
        return $this->hasManyThrough(
            Location::class,
            LocationProduct::class,
            'location_id',
            'id',
            'product_sku',
            'product_sku'
        );
    }
}

注意事项：

• location_products 和 order_lines 没有名为 id 的列。 从理论上讲，这个解决方案应该有效，但实际上并没有。
• 一个订单行可以有多个 location_products
• 一个 location_products 可以有多个位置

一些示例数据：

order_lines
- 2 (order_id)
- 80176 (product_sku)
- 14.99 (price)

location_products
- 80176 (product_sku)
- 1433 (location_id)

locations
- 1433 (id)
- Location 1433 (name)

我做错了什么？这样做时我总是得到一个空数组。

我是这样称呼的：

$order_lines = OrderLine::query()->where("order_id", "=", $order_id)->with("product")->get();
return OrderLineResource::collection($order_lines);

OrderLineResource：

public function toArray($request): array
    {
        return [
            'orderId' => $this->order_id,
            'productId' => $this->product->id,
            'productName' => $this->product->name,
            'productSku' => $this->product->sku,
            'price' => number_format($this->price, 2, '.', ''),
            'discount' => $this->discount,
            'quantity' => $this->quantity,
            'tax' => $this->tax,
            'createdAt' => $this->created_at,
            'updatedAt' => $this->updated_at,
            'locations' => LocationResource::collection($this->whenLoaded($this->locations))
        ];
    }

Answer 1

您可以使用以下代码：

class OrderLine extends Pivot
{
    use HasFactory;

    /**
     * @var bool
     */
    public $timestamps = false;

    public function locations(): HasManyThrough
    {
        return $this->hasManyThrough(
            Location::class, //Final model we wish to access
            LocationProduct::class, //The name of the intermediate model
            'product_sku',//Foreign key on location_products table
            'id',//Foreign key on locations table
            'product_sku',//Local key on order_lines table
            'location_id'//Local key on location_products table
        );
    }
}

如果你有任何问题，请告诉我。