如何在 Ruby on Rails 中使用 object.build 或 build_object 使用隐藏字段？

Question

我有一个嵌套的用户注册表单。我想为 3 个模型插入数据。 User、Store 和 Preference。这些关系是Userhas_many :stores 和has_one :preference。

问题我遇到的是隐藏字段没有显示在我的视图中。我没有正确使用@user.restaurants.build 和@user.build_preference 吗？

这是我的模型：

class User < ActiveRecord::Base
  attr_accessible :email, :full_name, :password, :password_confirmation
  has_secure_password

  validates_uniqueness_of :email
  validates_presence_of :full_name

  has_many :stores, :dependent => :destroy
  has_one :preference, :dependent => :destroy

  accepts_nested_attributes_for :stores
  accepts_nested_attributes_for :preference
end

class Store < ActiveRecord::Base
  attr_accessible  :name, :tagline, :address, :city, :postal, :state, :phone, :hours, :user_id

  belongs_to :user
end

class Preference < ActiveRecord::Base
  attr_accessible :background_fill, :background_position, :body_color, :body_font, :body_size, :heading_color, :heading_font, :heading_size, :layout, :link_color, :logo_color, :logo_size, :logo_font

  belongs_to :user
end

我的用户控制器：

class UsersController < ApplicationController

def new
  @user = User.new
  @user.stores.build
  @user.build_preference
end

我的观点：

<%= form_for @user do |f| %>
  <% if @user.errors.any? %>
  <div class="error_messages">
    <h2>There was an error!</h2>
    <ul>
      <% @user.errors.full_message.each do |message| %>
        <li><%= message %></li>
      <% end %>
    </ul>
  </div>
  <% end %>
  <%= f.label :full_name %>
  <%= f.text_field :full_name, :class => "target", :placeholder => "Your full name", :maxlength => "55", :autofocus => "autofocus" %>
  <%= f.label :email %>
  <%= f.email_field :email, :class => "target", :placeholder => "example@gmail.com", :maxlength => "55" %>
  <%= f.label :password %>
  <%= f.password_field :password, :class => "target", :placeholder => "Enter a password", :maxlength => "55" %>
  <%= f.label :password_confirmation, "Confirmation" %>
  <%= f.password_field :password_confirmation, :class => "target", :placeholder => "Enter your password again", :maxlength => "55" %>
  <% f.fields_for :stores do |builder| %>
    <%= builder.hidden_field :name, value: params[:name] %>
    <%= builder.hidden_field :tagline, value: params[:tagline] %>
    <%= builder.hidden_field :address, value: params[:address] %>
    <%= builder.hidden_field :city, value: params[:city] %>
    <%= builder.hidden_field :state, value: params[:state] %>
    <%= builder.hidden_field :postal, value: params[:postal] %>
    <%= builder.hidden_field :phone, value: params[:phone] %>
    <%= builder.hidden_field :hours, value: params[:hours] %>
  <% end %>
  <% f.fields_for :preference do |builder| %>
    <%= builder.hidden_field :layout, value: params[:layout] %>
    <%= builder.hidden_field :background_fill, value: params[:background_fill] %>
    <%= builder.hidden_field :background_position, value: params[:background_position] %>
  <% end %>
  <%= f.submit "Create an Account for Free", :class => "button cta" %>
<% end %>

另外，如果有任何帮助，我正在尝试遵循 Railscast 上的本教程：http://railscasts.com/episodes/196-nested-model-form-part-1

谢谢！

Answer 1

<% f.fields_for :preference do |builder| %>

这是必须的

<%= f.fields_for :preference do |builder| %>

您对f.fields_for 的其他呼叫也是如此。

来源：The API

Answer 2

我对 Rails 还很陌生，但我认为 build 应该在 create 操作中。

@user.stores.build(params[:user][:stores])

我猜是因为我没有尝试构建这样的视图我通常在步骤中创建用户创建用户然后通过构建创建关联