ruby-on-rails - 具有多态has_one模型的嵌套属性

Question

我在rails 2.3.5中将hass_one多态模型与accepts_nested_attributes_for一起使用
以下是模型及其关联:

class Address < ActiveRecord::Base
  attr_accessible :city, :address1, :address2
  belongs_to :addressable, :polymorphic => true
  validates_presence_of :address1, :address2, :city
end

class Vendor < ActiveRecord::Base
  attr_accessible :name, :address_attributes
  has_one  :address, :as => :addressable, :dependent => :destroy
  accepts_nested_attributes_for :address
end

这是 View :

- form_for @vendor do |f|
  = f.error_messages
  %p
    = f.label :name
    %br
    = f.text_field :name
  - f.fields_for :address_attributes do |address|
    = render "shared/address_fields", :f => address
  %p
    = f.submit "Create"

这是部分shared / address_fields.html.haml

%p
  = f.label :city
  %br= f.text_field :city
  %span City/Town name like Dharan, Butwal, Kathmandu, ..
%p
  = f.label :address1
  %br= f.text_field :address1
  %span City Street name like Lazimpat, New Road, ..
%p
  = f.label :address2
  %br= f.text_field :address2
  %span Tole, Marg, Chowk name like Pokhrel Tole, Shanti Marg, Pako, ..

这是 Controller :
类VendorsController

  def new
    @vendor = Vendor.new
  end

  def create
    @vendor = Vendor.new(params[:vendor])
    if @vendor.save
      flash[:notice] = "Vendor created successfully!"
      redirect_to @vendor
    else
      render :action => 'new'
    end
  end
end

问题是当我填写所有文件时，记录将按预期方式保存在两个表上。

但是，当我仅提交名称和城市或地址1时，验证有效，显示错误消息，但我在城市或地址1中输入的值不保留或未在地址表单字段内显示？

编辑操作也是如此。

尽管记录已保存，但地址未显示在编辑表单上。仅显示客户端模型的名称。
实际上，当我查看日志时，甚至根本不查询地址模型SQL。

Answer 1

为什么是f.fields_for :address_attributes？

不应该是:

- f.fields_for :address do |address_fields|
  = render "shared/address_fields", :f => address_fields

它不会在编辑和错误时加载值，因为您永远不会使用 address_attributes中的值加载 @vendor.address。