Ruby on rails 在rails中使用子查询

我有以下声明：

@addresses = Location.joins(:Address).where('address.address_id = ?', Location.all.select('address_id').uniq.where(['delivery_id = ?', @delivery.id])).order('time')

它不工作，它在我的第一个where语句附近打印了一个错误

PG::SyntaxError: FEHLER:  Syntaxfehler bei "SELECT"
LINE 1: ... = "locations"."id" WHERE (addresses.address_id = SELECT DIS...
                                                         ^
: SELECT "locations".* FROM "locations" INNER JOIN "addresses" ON "addresses"."l
ocation_id" = "locations"."id" WHERE (addresses.address_id = SELECT DISTINCT add
ress_id FROM "locations"  WHERE (delivery_id = 6))  ORDER BY time
Completed 500 Internal Server Error in 4ms

---

假设

添加.address\u id

是正确的字段名，您还需要在

中使用
，而不是
=
<代码>=
需要一个结果，但您返回的多个结果需要在

中输入

where('address.address_id IN (?)',...