我正在尝试使用设计和活跃的商家编写注册。表单很复杂，因为我的用户对象如下所示：
class User < ActiveRecord::Base
include ActiveMerchant::Utils
# Include default devise modules. Others available are:
# :token_authenticatable, :encryptable, :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :omniauthable
# Setup accessible (or protected) attributes
attr_accessible :email, :password, :password_confirmation, :remember_me, :username, :first_name,
:subscription_attributes, :last_name, :zipcode,
:payment_profile_attributes, :customer_cim_id, :payment_profile_id
...
# Track multi-page registration
attr_writer :current_step
...
# Setup Payment Profile element (authorize.net billing profile)
has_one :payment_profile, :dependent => :delete
accepts_nested_attributes_for :payment_profile
现在 PaymentProfile 类有自己的孩子，来自活跃商家的两项：
require 'active_merchant'
class PaymentProfile < ActiveRecord::Base
include ActiveMerchant::Billing
include ActiveMerchant::Utils
validate_on_create :validate_card, :validate_address
attr_accessor :credit_card, :address
belongs_to :user
validates_presence_of :address, :credit_card
def validate_address
unless address.valid?
address.errors.each do |error|
errors.add( :base, error )
end
end
end
def address
@address ||= ActiveMerchant::Billing::Address.new(
:name => last_name,
:address1 => address1,
:city => city,
:state => state,
:zip => zipcode,
:country => country,
:phone => phone
)
end
def validate_card
unless credit_card.valid?
credit_card.errors.full_messages.each do |message|
errors.add( :base, message )
end
end
end
def credit_card
@credit_card ||= ActiveMerchant::Billing::CreditCard.new(
:type => card_type,
:number => card_number,
:verification_value => verification_code,
:first_name => first_name,
:last_name => last_name
)
@credit_card.month ||= card_expire_on.month unless card_expire_on.nil?
@credit_card.year ||= card_expire_on.year unless card_expire_on.nil?
return @credit_card
end
现在，我使用 Ryan Bates 多页表单截屏视频 ( http://railscasts.com/episodes/217-multistep-forms ) 中的解决方案覆盖了 Devise 的 RegistrationsController 来处理多页表单。我不得不对其进行一些调整以使其与 Devise 一起使用，但我成功了。现在，因为 Ryan 的多页表单只是要求在不同页面上来自同一模型的不同字段，他能够valid?通过在他的 validate 方法中添加一个 :if 块来覆盖他的方法，例如：
validates_presence_of :username, :if => lambda { |o| o.current_step == "account" }
但就我而言，我从我的父模型（用户）询问第一个表单上的所有字段，然后从我的两个孙模型（用户：PaymentProfile：Address，用户：PaymentProfile：Credit_Card ) 在第二页。
我面临的问题是，虽然 PaymentProfile.valid? 根据 ActiveMerchant 的逻辑返回错误，表单本身不会呈现甚至显示这些错误。计费页面的视图代码如下所示：
<h2>Payment Details</h2>
<%= semantic_form_for(resource, :as => resource_name, :url => registration_path(resource_name)) do |f| %>
<%= devise_error_messages! %>
<%= f.semantic_fields_for :payment_profile do |p| %>
<%= p.semantic_fields_for :address do |a| %>
<%= a.inputs "Billing Information", :id => "billing" do %>
<%= a.input :type, :label => "Credit Card", :as => :select, :collection => get_creditcards %>
<%= a.input :number, :label => "Card Number", :as => :numeric %>
<%= a.input :card_expire_on, :as => :date, :discard_day => true, :start_year => Date.today.year, :end_year => (Date.today.year+10), :add_month_numbers => true %>
<%= a.input :first_name %>
<%= a.input :last_name %>
<%= a.input :verification_code, :label => "CVV Code" %>
<% end %>
<% end %>
<%= f.semantic_fields_for :credit_card do |c| %>
<%= c.inputs "Billing Address", :id => "address" do %>
<%= c.input :address1, :label => "Address" %>
<%= c.input :city %>
<%= c.input :state, :as => :select, :collection => Carmen::states %>
<%= c.input :country, :as => :select, :collection => Carmen::countries, :selected => 'US' %>
<%= c.input :zipcode, :label => "Postal Code" %>
<%= c.input :phone, :as => :phone %>
<% end %>
<% end %>
<% end %>
<%= f.commit_button :label => "Continue" %>
<% unless @user.first_step? %>
<%= f.commit_button :label => "Back", :button_html => { :name => "back_button" } %>
<% end %>
<% end %>
puts errors我在有效代码之后立即在代码中添加了一条消息？命令，它显示如下：
{:base=>[["first_name", ["cannot be empty"]], ["last_name", ["cannot be empty"]], ["year", ["expired", "is not a valid year"]], ["type", ["is required", "is invalid"]], ["number", ["is not a valid credit card number"]], ["verification_value", ["is required"]], ["address1", ["is required"]], ["city", ["is required"]], ["state", ["is required"]], ["zip", ["is required", "must be a five digit number"]], ["phone", ["is required", "must be in the format of 333-333-3333"]]]}
{:base=>[["first_name", ["cannot be empty"]], ["last_name", ["cannot be empty"]], ["year", ["expired", "is not a valid year"]], ["type", ["is required", "is invalid"]], ["number", ["is not a valid credit card number"]], ["verification_value", ["is required"]], ["address1", ["is required"]], ["city", ["is required"]], ["state", ["is required"]], ["zip", ["is required", "must be a five digit number"]], ["phone", ["is required", "must be in the format of 333-333-3333"]]]}
现在这个输出的结构与标准错误输出的输出不匹配，标准错误输出是基于单层哈希构建的，例如：
{:username=>["can't be blank"]}
因此，在向您展示了所有这些之后，我的问题是：a) 如何让错误输出正确显示，以便表单实际将它们吐出？b）我如何防止parent.valid？从也验证grandchildren.valid？当我不在那个页面上时？我不能在子模型上使用 :if => lambda... 解决方案，因为他们不知道 current_step 是什么。
我为这么长的帖子道歉，我只是想包含尽可能多的信息。我已经为此苦苦挣扎了一个星期，但我似乎无法克服它。任何建议都会非常有帮助。提前致谢。