L5.6 - 数据透视表的关系

L5.6 - Relation on pivot table(L5.6 - 数据透视表的关系)

问题描述

我在枢轴表上有一个关系；我如何扩展它?

I've a relation on a pivot table; how I can expand It?

例如:

商店:

• id
• 姓名

产品:

• id
• 姓名

product_shop:

• product_id
• shop_id
• field_1
• field_2
• field_3
• table_A_id

table_A:

• id
• 姓名

Shops 模型中的多对多关系是:

The relation Many-to-Many in the Shops Model is:

class Shops extends Model {
    public function products()
    {
        return $this->belongsToMany('Products', 'product_shop', 'product_id', 'shop_id')->withPivot(
            'field_1',
            'field_3',
            'field_3',
            'table_A_id'
            )
            ->as('product_shop')
            ->withTimestamps();
    }

}

检索所有数据的查询是:

and the query to retrieve all data is:

class GetData extends Model {
     public static function getAll() {
         $query = Shops::with(
            'products'
            )->get();
     }
}

这会返回product_shop.table_A_id，但我想扩展外键并检索table_A.name；有办法吗?

This return the product_shop.table_A_id but I'd like to expand the foreign key and retrieve table_A.name; is there a way?

谢谢.

推荐答案

您可以使用枢轴模型:

class ProductShopPivot extends IlluminateDatabaseEloquentRelationsPivot
{
    public function tableA()
    {
        return $this->belongsTo(TableA::class);
    }
}

class Shops extends Model
{
    public function products()
    {
        return $this->belongsToMany('Products', 'product_shop', 'product_id', 'shop_id')
            ->withPivot(
                'field_1',
                'field_3',
                'field_3',
                'table_A_id'
            )
            ->as('product_shop')
            ->withTimestamps()
            ->using(ProductShopPivot::class);
    }
}

然后像这样访问它:

$shop->product_shop->tableA->name

不幸的是，没有办法预先加载 tableA 关系.

Unfortunately, there is no way to eager load the tableA relation.

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