Question

我正在尝试使用validates_timeliness,以确保SliderImage.start始终在SliderImage.stop之前。

class SliderImage < ActiveRecord::Base

  validates_datetime :start, :stop
  validates :start, :timeliness => {:before => stop}

end

但当然没有界定<条码>。我如何能够做到这一点?

Answer 1

The stop value must be called on the record object being evaluated. The shorthand version is pass the symbol :stop, and this be assumed to be method on the record which will called at validation time.

否则,你就可使用lam子。

lambda {|r| r.stop }

我倾向于写一下你的证明。

validates_datetime :start
validates_datetime :stop, :after => :start

p.s. I m the plugin author :

Answer 2

在不安装任何灰色的情况下使用这种鉴定的更简单方式是要求采用一种方法验证:

class Course < ActiveRecord::Base
  validate :start_date_before_end_date

  def start_date_before_end_date
    if self.start_date > self.end_date
      errors.add(:start_date, "Start date should be before end date")
    end
  end
end

友情链接