ruby-on-rails – 如何在join / eager_load中取消验证default_scope？

2019年7月28日 269次阅读

我有两个型号：

class User
  default_scope -> { where(deleted_at: nil) }
end

class Order 
  belongs_to :user
end

我希望获得已删除或未删除用户的订单：

Order.joins(:user).merge(User.unscoped)
Order.joins(:user).merge(User.unscope(where: :deleted_at))
# SELECT  "orders".* FROM "orders" 
# INNER JOIN "users" ON "users"."id" = "orders"."user_id" AND "users"."deleted_at" IS NULL 
# ORDER BY "orders"."id" DESC LIMIT 1

Order.eager_load(:user).merge(User.unscoped)
Order.eager_load(:user).merge(User.unscope(where: :deleted_at))
# SELECT  "orders"."id" AS t0_r0, "orders"."user_id" AS t0_r1, 
# "users"."id" AS t1_r0, "users"."deleted_at" AS t1_r1 FROM "orders" 
# LEFT OUTER JOIN "users" ON "users"."id" = "orders"."user_id" AND "users"."deleted_at" IS NULL 
# ORDER BY "orders"."id" DESC LIMIT 1

这些都不起作用.

每个查询都将“AND”用户“.”deleted_at“IS NULL”添加到join语句中.

如果我指定关联范围,则没有任何变化：

class Order
  belongs_to :user, -> { unscoped } 
end

但是包括按预期工作：

Order.includes(:user).merge(User.unscoped).last
# SELECT  "orders".* FROM "orders" ORDER BY "orders"."id" DESC LIMIT 1
# SELECT "users".* FROM "users" WHERE "users"."id" = 1054

如何在连接中使用rails来取消关联？

最佳答案 你可以这样试试.它适用于Rails 3,但不确定Rails 4.

User.unscoped { Order.joins(:user) }
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