我有两个类:
class Customer
has_many :packages
end
class Package
belongs_to :customer
end
如何进行这样的查询？
Customer.includes(:packages).where(packages: 'expires_at < Date.current')
通过控制台的示例测试，我得到了它:Customer Load (26.0ms) SELECT "customers".* FROM "customers" INNER JOIN "packages" ON "packages"."customer_id" = "customers"."id" WHERE (packages.expires_at < '2019-03-13') LIMIT $1 [["LIMIT", 11]]
Traceback (most recent call last):
ActiveRecord::StatementInvalid (PG::UndefinedFunction: ERROR: operator does not exist: integer = uuid)
LINE 1: ...INNER JOIN "packages" ON "packages"."customer_id" = "custome...
^
HINT: No operator matches the given name and argument type(s). You might need to add explicit type casts.
: SELECT "customers".* FROM "customers" INNER JOIN "packages" ON "packages"."customer_id" = "customers"."id" WHERE (packages.expires_at < '2019-03-13') LIMIT $1
irb(main):003:0>
最佳答案
您可以在引号内传递 where 表达式并绑定(bind) expires_at 的值。
Customer.includes(:packages).where('packages.expires_at < ?', Date.current)
关于ruby-on-rails - ActiveRecord 查询(包含或加入)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/55153644/