仅在virt_attribute为false时验证字段 [英] Validate fields only if virt_attribute is false

问题描述

我有这样的模型:

class Order < ActiveRecord::Base
  attr_accessible :**** :phone_number, :receiver, :shipping_id, :street, :totalcost, :user_id, :zip, :use_user_data
  attr_accessor :use_user_data
  validates :city, :presence => {:message =>  I18n.t(:city_not_chosen)}
  validates :zip, :presence => {:message =>  I18n.t(:zip_not_chosen)}
  validates :street, :presence => {:message =>  I18n.t(:street__not_chosen)}
  validates :building, :presence => {:message =>  I18n.t(:building_not_chosen)}
  validates :phone_number, :presence => {:message =>  I18n.t(:phone_number_not_chosen)}
  validates :receiver, :presence => {:message =>  I18n.t(:receiver_not_chosen)}
end

您可以看到我在模型中设置了一些非数据库字段(use_user_data)-虚拟属性...

As you can see i set in model some field which is non-db field (use_user_data) - virtual attribute...

但是，如果:use_user_data为假，则正确并正确地进行验证，但如果为true则不进行验证，怎么办?

But how to do, if :use_user_data is false, good and right validate, but when true didn't validate?

我这样尝试:

validates :city, :presence => {:message =>  I18n.t(:city_not_chosen)}, :unless => :use_user_data

等等

with_options :unless => :use_user_data do |order|
    order.validates :city, :presence => {:message =>  I18n.t(:city_not_chosen)}
  end

但这对我没有帮助...为什么?

but it doesn't help me... Why?

也是我的表格:

= form_for @order do |f|
  %div
    = f.label :use_user_data , "Использовать данные вашего профиля*: "
    = label :use_user_data , "Да"
    = f.radio_button :use_user_data, true, :required => true, :id => "use_user_data", :checked => true
    = label :use_user_data , "Нет"
    = f.radio_button :use_user_data, false, :required => true, :id => "dont_use_user_data"

也是我写

validates :city, :presence => {:message =>  I18n.t(:city_not_chosen)}, :if => :use_user_data

我收到验证消息...但是，仅当错误时怎么办?为什么我的解决方案不起作用?

i get validation messages... But how to do only if false? And why my solution didn't work?

推荐答案

该表单将"true"或"false"字符串传递给对象，而不是布尔值true或false.由于这是一个虚拟属性，因此不会执行任何类型转换.在Ruby中，"true"和"false"都是true，因此您需要使用某种方法来强制转换值

The form passes "true" or "false" string to the object, not boolean true or false. Since it's a virtual attribute, no typecasting performed. In Ruby, both "true" and "false" are true, so you need to use something to typecast the value

with_options :unless => Proc.new{ |a| a.use_user_data == 'true' } do |order|
  order.validates ...
end

或

with_options :unless => :use_user_data? do |order|
  order.validates ...
end

def use_user_data?
  use_user_data == 'true'
end

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