Ruby on rails嵌套表单模型

时间:2010-02-02 01:07:56

标签: ruby-on-rails actionview actioncontroller

我正在尝试使用rails嵌套的form_for帮助程序,但是我收到以下错误:

BlogPage(#49859550)预期,得到阵列(#31117360)

以下是我的模型对象:

class Blog < ActiveRecord::Base
  # Table Configuration
  set_table_name "blog"

 # Model Configuration
 belongs_to :item
 has_many :blog_pages
 accepts_nested_attributes_for :blog_pages, :allow_destroy => true
end

class BlogPage < ActiveRecord::Base
  # Table Configuration
  set_table_name "blog_page"

  # Model Configuration
  belongs_to :blog
end

这是我生成的表单(省略了不必要的HTML):

<% form_for :blog, :url => { :action => :create } do |blog_form| %>  
    <%= blog_form.text_field :title, :style => "width: 400px" %>  
    <% blog_form.fields_for :blog_pages do |page_fields| %>
        <% @blog.blog_pages.each do |page| %>  
            <%= page_fields.text_area :content, :style => "width: 100%",
                :cols => "10", :rows => "20" %>
        <% end %>
    <% end %>
<% end %>

以下是发送到控制器的参数:

{ “提交”=&gt; “中保存”,  “blog”=&gt; {“blog_pages”=&gt; {“content”=&gt;“这是新的博客条目内容。”},  “title”=&gt;“这是一个新的博客条目。”,  “完成”=&gt; “中1”},  “authenticity_token”=&gt; “中T1Pr1g9e2AjEMyjtMjLi / ocrDLXzlw6meWoLW5LvFzc =”}

以下是具有执行创建操作的BlogsController:

class BlogsController < ApplicationController
  def new
    @blog = Blog.new # This is the line where the error gets thrown.  
    # Set up a page for the new blog so the view is displayed properly.
    @blog.blog_pages[0] = BlogPage.new
    @blog.blog_pages[0].page_number = 1
    respond_to do |format|
      format.html # Goes to the new.html.erb view.
      format.xml { render :xml => @blog }
      format.js { render :layout => false}
    end
  end

  def create
    @blog = Blog.new(params[:blog])

    respond_to do |format|
      if @blog.save
        render :action => :show
      else
        flash[:notice] = "Error occurred while saving the blog entry."
        render :action => :new
      end
    end
  end
end

如果有人能帮助我,我会非常感激。我仍然是ruby和rails框架的新手,并且无法通过Google搜索自行解决问题。

感谢。

2 个答案:

答案 0 :(得分:2)

答案 1 :(得分:0)

将表单更改为:

<% form_for :blog, :url => { :action => :create } do |blog_form| %>  
    <%= blog_form.text_field :title, :style => "width: 400px" %>  
    <% blog_form.fields_for :blog_pages do |page_fields| %>
            <%= page_fields.text_area :content, :style => "width: 100%",
                :cols => "10", :rows => "20" %>
    <% end %>
<% end %>

如果你使用fields_for,它会自动迭代blog_pages。但是我不确定这是否会导致错误。