我正在尝试编写带有条件的嵌套联接查询。
我现在有的查询是:
Event.joins(:store => :retailer).where(store: {retailer: {id: 2}})
输出以下SQL:
SELECT "events".* FROM "events" INNER JOIN "stores" ON "stores"."id" = "events"."store_id" INNER JOIN "retailers" ON "retailers"."id" = "stores"."retailer_id" WHERE "store"."retailer_id" = '---
:id: 2
'
还有以下错误:
SQLite3::SQLException: no such column: store.retailer_id: SELECT "events".* FROM "events" INNER JOIN "stores" ON "stores"."id" = "events"."store_id" INNER JOIN "retailers" ON "retailers"."id" = "stores"."retailer_id" WHERE "store"."retailer_id" = '---
:id: 2
'
它告诉我没有列store.retailer_id,但是,我可以运行以下查询,它将正常运行:
Event.first.store.retailer_id
Event Load (0.2ms) SELECT "events".* FROM "events" ORDER BY "events"."id" ASC LIMIT 1
Store Load (0.1ms) SELECT "stores".* FROM "stores" WHERE "stores"."id" = ? LIMIT 1 [["id", 28958]]
=> 4
最佳答案
看起来您不需要此处的嵌套联接。尝试使用类似
Event.joins(:store).where(stores: {retailer_id: 2})
嵌套联接也应使用
stores
起作用Event.joins(:store => :retailer).where(stores: {retailer: {id: 2}})