[英]Laravel - how to eager load relation of custom intermediate table
我有三个模型,SalesReturn、Product 和 ProductSalesReturn,它们的关系如下:
class SalesReturn extends Model
{
public function products()
{
return $this->belongsToMany(Product::class)
->withTimestamps()
->using(ProductSalesReturn::class);
}
}
我使用ProductSalesReturn
来表示中间表( https://laravel.com/docs/6.x/eloquent-relationships#defining-custom-intermediate-table-models ),并且ProductSalesReturn
与Unit
有关系:
class ProductSalesReturn extends Pivot
{
public function unit()
{
return $this->belongsTo(Unit::class);
}
}
当我像下面的代码一样渴望加载unit
关系时:
SalesReturn::with(['products', 'products.unit'])->find($id);
我会收到以下错误:
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'units.product_id' in 'where clause' (SQL: select * from `units` where `units`.`product_id` in (1031, 1631, 13391, 14361, 16981, 17441, 41982, 45982, 55741) and `units`.`deleted_at` is null)
表模式如下:
CREATE TABLE `sales_returns` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`number` varchar(20) COLLATE utf8mb4_unicode_ci NOT NULL,
`user_id` bigint(20) NOT NULL,
`order_id` bigint(20) NOT NULL,
`note` text COLLATE utf8mb4_unicode_ci NOT NULL,
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
CREATE TABLE `product_sales_return` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`sales_return_id` bigint(20) NOT NULL,
`product_id` bigint(20) NOT NULL,
`unit_id` bigint(20) NOT NULL,
`price` double NOT NULL,
`amount` int(11) NOT NULL,
`gross_profit` double NOT NULL DEFAULT '0',
`created_at` timestamp NULL DEFAULT NULL,
`updated_at` timestamp NULL DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
如何在 Laravel 中急切加载自定义中间表的关系?
谢谢你。
您可以使用Laravel Eloquent:急切加载 Pivot 关系
安装
composer require ajcastro/eager-load-pivot-relations
配置
use AjCastro\EagerLoadPivotRelations\EagerLoadPivotTrait;
class Product extends Model
{
// Use the trait here to override eloquent builder.
// It is used in this model because it is the relation model defined in
// SalesReturn::products() relation.
use EagerLoadPivotTrait;
}
用法
return SalesReturn::with('products.pivot.unit')->get();
在您的
produtcts
关系中定义table
、foreignPivotKey
和relatedPivotKey
belongsToMany
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