查询 Laravel 关系、产品、仓库和销售额

Question

我正在使用 Laravel 管理不同仓库中的产品和销售，有四个表：products、storehouses、sales 和 saleItems，简化后看起来像这样：

Storhouse ID、地址、...

产品 ID、名称、...

销售 id, store_id, ...

SaleItems id, product_id, sale_id, qty, ...

问题是如何获取每个仓库中每个产品的产品列表和销售计数，有人知道如何做到这一点吗？

以下是模型：

class Product extends Model 
{
    public function sales(){
      return $this->hasMany('App\Models\SaleItem');
    }
}

class Sale extends Model
{
  public function storehouse(){
    return $this->belongsTo('App\Models\Storehouse');
  }
  public function items(){
    return $this->hasMany('App\Models\Saleitem');
  }
}

class SaleItem extends Model
{
  public function sale(){
    return $this->belongsTo('App\Models\Sale');
  }
  public function product(){
    return $this->belongsTo('App\Models\Product');
  }
}

class Storehouse extends Model
{
  public function sales() {
    return $this->hasMany('App\Models\Sale');
  }
}

Answer 1

Eloquent 对于管理和查询基本关系非常有用，但它在用于包含各种分组、聚合器等的复杂查询时会变得更加棘手。在这种情况下，我建议执行实际的 sql 查询：

SELECT P.id, P.name, SH.id, sum(SI.qty) as quantity
FROM products as P 
JOIN sale_items as SI on SI.product_id = P.id
JOIN sale as S on SI.sale = S.id
JOIN store_houses as SH on store_houses.id = S.store_id
GROUP BY P.id, SH.id

你可以像这样在 laravel 中使用：

$result = DB::select('SELECT P.id, P.name, SH.id, sum(SI.qty) as quantity
FROM products as P 
JOIN sale_items as SI on SI.product_id = P.id
JOIN sale as S on SI.sale = S.id
JOIN store_houses as SH on store_houses.id = S.store_id
GROUP BY P.id, SH.id');

Answer 2

@gbalduzzi，感谢您的快速解决方案，您说得对，经典的 sql 查询是可行的方法，我已经修复了一些命名问题，现在可以使用，但是缺少产品信息，我没有认为结果是正确的：/

$data = DB::select('SELECT P.id, P.name, SH.id, SH.name, sum(SI.qty) as sales
        FROM products as P 
        JOIN sale_items as SI on SI.product_id = P.id
        JOIN sales as S on SI.sale_id = S.id
        JOIN storehouses as SH on SH.id = S.storehouse_id
        GROUP BY P.id, SH.id');

还有其他问题，这里的id是那个

    [
      {
    "id": 1,
    "name": "Storehouse 01",
    "sales": "5.00"
  },
  {
    "id": 2,
    "name": "Storehouse 02",
    "sales": "8.00"
  },
  {
    "id": 1,
    "name": "Storehouse 01",
    "sales": "9.00"
  },
  {
    "id": 2,
    "name": "Storehouse 02",
    "sales": "6.00"
  },
  {
    "id": 1,
    "name": "Storehouse 01",
    "sales": "15.00"
  } ... ]