ruby-on-rails – 如何使用自定义谓词通过干验证来验证多个字段？

我有一个地址表单,我想作为一个整体验证,而不是自己验证每个输入.我只能通过将line1,city,state,zip传递给自定义谓词方法来判断地址是否有效,以便它可以将它们作为一个单元进行检查.

我怎样才能做到这一点？我只看到如何验证单个字段.

最佳答案

更新 – 这适用于ActiveRecords而不是干验证gem.

请参阅本教程,http://guides.rubyonrails.org/active_record_validations.html

引用教程,

You can also create methods that verify the state of your models and add messages to the errors collection when they are invalid. You must then register these methods by using the validate (API) class method, passing in the symbols for the validation methods’ names.

class Invoice < ApplicationRecord
  validate :discount_cannot_be_greater_than_total_value

  def discount_cannot_be_greater_than_total_value
    if discount > total_value
      errors.add(:discount, "can't be greater than total value")
    end
  end
end