Ruby on rails nested form model - ruby-on-rails

Question

I'm trying to use rails nested form_for helper, but I am getting the following error:
BlogPage(#49859550) expected, got Array(#31117360)
Here are my model objects:
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
Here is the form I generated (left out unnecessary 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 %>
Here are the parameters that are sent to the controller:
{"commit"=>"Save",
"blog"=>{"blog_pages"=>{"content"=>"This is the new blog entries contents."},
"title"=>"This is a new blog entry.",
"complete"=>"1"},
"authenticity_token"=>"T1Pr1g9e2AjEMyjtMjLi/ocrDLXzlw6meWoLW5LvFzc="}
Here is the BlogsController with the create action that gets executed:
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
If anyone can help me with this I would greatly appreciate it. I'm still pretty new to ruby and the rails framework and couldn't solve the problem on my own by googling.
Thanks.

Answer 1

Have you seen this?
http://media.pragprog.com/titles/fr_arr/multiple_models_one_form.pdf

Answer 2

Change your form to this:
<% 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 %>
If you use fields_for it iterates over blog_pages automaticaly. However I'm not sure if this caused errors.