partial form for nested models in rails 3 - ruby-on-rails

Question

I have two models pages and author, here is the code of model pages:
edit -1
now my models are as follows:
class Page < ActiveRecord::Base
validates :title, :presence => true
belongs_to :author
end
author model:
class Author < ActiveRecord::Base
has_many :pages
end
and my form is as follows:
<%= form_for(#page) do |f| %>
<% if #page.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#page.errors.count, "error") %> prohibited this post from being saved:</h2>
<ul>
<% #page.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<p>
<%= f.label :title %><br />
<%= f.text_field :title %>
</p>
<p>
<%= f.label :body %><br />
<%= f.text_area :body %>
</p>
<p>
<%= f.fields_for :author do |fields| %>
<%= f.label :author %><br />
<%= fields.text_field :author %>
<% end %>
</p>
<p>
<%= f.label :email %><br />
<%= f.text_field :email %>
</p>
<p>
<%= f.label :reference %><br />
<%= f.select(:reference,[['google',1],['yahoo',2],['MSN',3],['Ask',4]]) %>
</p>
<%= f.submit "Submit" %>
<% end %>
and controller :
class PagesController < ApplicationController
def index
#total = Page.count
#pages = Page.find(:all)
end
def show
#page = Page.find(params[:id])
end
def new
#page = Page.new
end
def create
#page = Page.new(params[:page])
if #page.save
redirect_to pages_path, :notice => "The data has been saved!"
else
render "new"
end
end
def edit
#page = Page.find(params[:id])
end
def update
#page = Page.find(params[:id])
if #page.update_attributes(params[:page])
redirect_to pages_path, :notice => "Your post has been updated!"
else
render "edit"
end
end
def destroy
#page = Page.find(params[:id])
#page.destroy
redirect_to pages_path, :notice => "Your page has been deleted!"
end
end
Now when i am submitting the form it is giving me this error:
ActiveRecord::AssociationTypeMismatch in PagesController#create
Author(#40328004) expected, got ActiveSupport::HashWithIndifferentAccess(#32291496)
Rails.root: C:/rorapp
Application Trace | Framework Trace | Full Trace
app/controllers/pages_controller.rb:19:in `new'
app/controllers/pages_controller.rb:19:in `create'
Request
Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"hzBlXsdUjEDDCLp036R8bJBwep6BdATSvJPNwt0M8Dg=",
"page"=>{"title"=>"",
"body"=>"",
"author"=>{"author"=>""},
"email"=>"",
"reference"=>"1"},
"commit"=>"Submit"}
Show session dump
Show env dump
Response
Headers:
None
and one more problem if I add accepts_nested_attributes_for :author to my Page model, then the field is not displayed at all. I really want to accomplish this.. any help?

Answer 1

Apparently this doesn't work in reverse with the association. I'm sorry for the mistake. You could do the following, but then your pages controller is acting on the author, which isn't really appropriate. You could make an author controller though, and include fields_for :pages, to have the author and the first page created at the same time.
class PagesController < ApplicationController
def new
#author = Author.new
#page = #author.pages.new
end
def create
#author = Author.create(params[:author])
end
end
class Author < ActiveRecord::Base
has_many :pages
accepts_nested_attributes_for :pages
end
class Page < ActiveRecord::Base
belongs_to :author
end
<%= form_for(#author, :url => pages_url) do |f| %>
<%= f.text_field :author %>
<%= f.fields_for :pages do |fields| %>
<%= fields.text_area :body %>
<% end %>
<% end %>