ruby-on-rails - Rails : Validating that start is before stop, 日期时间

Question

我正在尝试使用 validates_timeliness确保 SliderImage.start 总是在 SliderImage.stop 之前:

class SliderImage < ActiveRecord::Base

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

end

当然 stop 还没有定义。我怎样才能做到这一点？

Answer 1

在不安装任何 gem 的情况下使用此验证的更简单方法是调用方法来验证:

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