Rails - Mar 2008 - Help using a single form to update three models

Really hoping someone on this forum can help me out  - any help is
greatly appreciated.

I have been through the Ryan B railcasts and tutorials on using a
single form to update more than one model.  They are all based on the
concept of having Project model that has many Tasks.  The application
I am working on requires a third level of model added  to the form so
Projec has many Tasks and Task has many Task Details.  I can display
the form in the "new" action so that all fields show up and it appears
right.  However, I can not get the "create" to work, not sure if the
problem is "create" in my controller, or the hash being created in my
fields_for tag.

class Project < ActiveRecord::Base
has_many :tasks

def task_attributes=(task_attributes)
  task_attributes.each do |attributes|
  	tasks.build(attributes)
  end
 end
end

class Task < ActiveRecord::Base
has_many :task_details
belongs_to :projects

def task_detail_attributes=(task_detail_attributes)
  task_detail_attributes.each do |attributes|
  	task_details.build(attributes)
  end
 end

end

class TaskDetail < ActiveRecord::Base
belongs_to :tasks
end

class ProjectController < ApplicationController

def index
  @projects = Project.find(:all)
end

def new
  @project = Project.new
  @project.tasks.build
  @task = Task.new
  @task.task_details.build
end

def create
  @project = Project.new(params[:project])
  @task = Task.new(params[:task])
  params[:task].each_value { |task_detail|
@task.task_details.build{task_detail} }
  if @project.save and @task.save
    flash[:notice] = "Successfully created project."
    render :action => ''index''
  else
    render :action => ''new''
  end
end

end

<% form_for :project, :url => { :action => :create } do |f| %>
	<p>
	  Name: <%= f.text_field :name %>
	  Date: <%= f.date_select(:date) %>
	</p>
	<% for task in @project.tasks %>
	  <% fields_for "project[task_attributes][]", task do |task_form|
%>
	  	<p>
	  	  Name: <%= task_form.text_field :name %>
	  	  Description: <%= task_form.text_area :description %>
	  	  Fixed Task: <%= task_form.check_box :fixed_flg %>
	  	</p>
	 <% end %>

	 <% for task_detail in @project.tasks %>
	   <% fields_for "task[task_detail_attributes][]", task_detail do
|
detail_form| %>
	   	<p>
	   	Sub Task: <%= detail_form.text_field :sub_task %>
	   	Assigned: <%= detail_form.check_box :assigned_flg %>
	   	</p>
	    <% end %>
	  <% end %>
	 <% end %>

 <p> <%= submit_tag "Create Project" %> </p>
<% end %>




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