ruby-on-rails - 基于日期时间属性的唯一验证，而不是值？

Question

我希望一个字段是唯一的，基于是否存在另一个日期时间属性。

就像是：

validates :promo_code, uniqueness: { scope: [:archived_at] }

经过：

promo_code = TENOFF, archived_at = null

promo_code = TENOFF, archived_at = not null

promo_code = TENOFF, archived_at = not null

失败：

promo_code = TENOFF, archived_at = null

promo_code = TENOFF, archived_at = null

是通过自定义验证器执行此操作的唯一方法吗？

标签： ruby-on-railsactiverecord

Answer 1

试试这个，使用if或unless

validates :promo_code, uniqueness: { scope: [:archived_at] }, unless: Proc.new { |o| o.archived_at.blank? }