1
我有产品和股票。每个股票包含product_id, color_id, storage_id and in_stock
。导轨组通过使嵌套表
对于给定的产物I通过存储要组股然后颜色和输出IN_STOCK等:
寄存1
- 寄存1
- A色:IN_STOCK
- B色: in_stock
- 存储2:
- 色:IN_STOCK
- 彩色B:IN_STOCK
可惜我不能渲染视图。
到目前为止,我的查询如下:
def all_units_in_stock
stocks.in_stock.group(:storage_id, :color_id).includes(:storage, :color)
end
which returns
Product.find(11).all_units_in_stock
Product Load (37.1ms) SELECT "products".* FROM "products" WHERE "products"."id" = ? LIMIT 1 [["id", 11]]
Stock Load (0.3ms) SELECT "stocks".* FROM "stocks" WHERE "stocks"."product_id" = 11 AND (in_stock > 0) GROUP BY storage_id
Storage Load (0.2ms) SELECT "storages".* FROM "storages" WHERE "storages"."id" IN (1, 2, 3, 4, 5)
Color Load (0.2ms) SELECT "colors".* FROM "colors" WHERE "colors"."id" IN (3)
=> [#<Stock id: 162, product_id: 11, storage_id: 1, in_stock: 10.0, created_at: "2011-11-07 22:54:50", updated_at: "2011-11-07 22:54:50", color_id: 3>, #<Stock id: 163, product_id: 11, storage_id: 2, in_stock: 10.0, created_at: "2011-11-07 22:54:50", updated_at: "2011-11-07 22:54:50", color_id: 3>