ruby-on-rails – 如何根据其他属性值添加自定义验证消息？

发布时间：2020-12-17 02:03:44 所属栏目：百科来源：网络整理

导读：我正在使用 Ruby on Rails 3.2.9而我只是想使用 state_machine gem.我有以下声明： # Model class attributes are:## [String] status# [Boolean] checkin_1# [Boolean] checkin_2#class Article ActiveRecord::Base state_machine :attribute = :status,:in

我正在使用 Ruby on Rails 3.2.9而我只是想使用 state_machine gem.我有以下声明：

# Model class attributes are:
#
# [String]  status
# [Boolean] checkin_1
# [Boolean] checkin_2
#
class Article < ActiveRecord::Base
  state_machine :attribute => :status,:initial => :unconfirmed do
    state :confirmed,:value => 'confirmed'
    state :unconfirmed,:value => 'unconfirmed'

    event :confirm do
      transition :unconfirmed => :confirmed
    end

    event :unconfirm do
      transition :confirmed => :unconfirmed
    end
  end
end

我想在触发确认事件并且checkin_1和/或checkin_2值为false时向实例对象添加自定义验证消息(避免保存这些对象).也就是说,鉴于我正在尝试确认以下每个对象：

<#Article id: 1,:status: 'unconfirmed',checkin_1: false,checkin_2: false>
<#Article id: 1,checkin_2: true>
<#Article id: 1,checkin_1: true,checkin_2: false>

然后我想避免保存对象并分别添加错误消息,如下所示：

"can not be confirmed if it is not checked for 1 and 2"
"can not be confirmed if it is not checked for 1"
"can not be confirmed if it is not checked for 2"

我该怎么做？

解决方法

这样做怎么样：

state confirmed do
  validate do
    if !checkin_1 and !checkin_2
       msg = "can not be confirmed if it is not checked for 1 and 2"
       errors.add(:checkin_1,msg)
       errors.add(:checkin_2,msg)
    elsif !checkin_1
       errors.add(:checkin_1,"can not be confirmed if it is not checked for 1")
    elsif !checkin_2
       errors.add(:checkin_2,"can not be confirmed if it is not checked for 2")
    end
  end
end

（编辑：李大同）

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