Rails - Mar 2010 - Nested model form problem, not saving, any help?

I have two models, Curso and Ementa

class Curso < ActiveRecord::Base

  attr_accessible :nome, :descricao,
:periodo_inscricao_inicio,
> :periodo_inscricao_fim
>   has_one :ementa, :dependent => :destroy
  has_many :turmas

  has_many :publico_alvos

>   accepts_nested_attributes_for :ementa


end


class Ementa < ActiveRecord::Base

  belongs_to :curso

end


One form for hadle both models

<% form_for @curso do |f| %>

<%= f.error_messages %>

<p>

    <%= f.label :nome %>

    <br/>

    <%= f.text_field :nome %>

</p>

<p>

    <%= f.label :descricao %>

    <br/>

    <%= f.text_area :descricao %>

</p>

<p>

    <%= f.label :periodo_inscricao_inicio %>

    <br/>

    <%= f.date_select :periodo_inscricao_inicio %>

</p>

<p>

    <% fields_for :ementa do |ementa_form| %>

<%= ementa_form.label :descricao, "Ementa" %>

    <%= ementa_form.text_field :descricao %>

<% end %>

</p>

<p>

    <%= f.label :periodo_inscricao_fim %>

    <br/>

    <%= f.date_select :periodo_inscricao_fim %>

</p>

<p>

    <%= f.submit "Submit" %>

</p>

<% end %>


the controller

class CursosController < ApplicationController

  def index

    @cursos = Curso.all

  end



  def show

    @curso = Curso.find(params[:id])

>     respond_to do |format|
      format.html {render :layout=>false}

    end

  end



  def new

    @curso = Curso.new

    @curso.build_ementa

>     respond_to do |format|
      format.html {render :layout=>false}

    end

  end



  def create

    @curso = Curso.new(params[:curso])

    if @curso.save

      flash[:notice] = "Successfully created curso."

      redirect_to @curso

    else

      render :action => ''new''

    end

  end



  def edit

    @curso = Curso.find(params[:id])

>     respond_to do |format|
      format.html {render :layout=>false}

    end

  end



  def update

    @curso = Curso.find(params[:id])

    if @curso.update_attributes(params[:curso])

      flash[:notice] = "Successfully updated curso."

      redirect_to @curso

    else

      render :action => ''edit''

    end

  end



  def destroy

    @curso = Curso.find(params[:id])

    @curso.destroy

    flash[:notice] = "Successfully destroyed curso."

    redirect_to cursos_url

  end

end


The result is just one insert on curso table, why it is not inserting on
ementa table to the "descricao" field?

Console result:

Processing CursosController#create (for 127.0.0.1 at 2010-03-01
00:46:32)
> [POST]
  Parameters:
>
{"authenticity_token"=>"aZzxtPN1y4nOWB3GwAAWSqGfU1iEPIiL2+rbEjjIr3k=",
> "curso"=>{"nome"=>"Test",
"descricao"=>"test",
> "periodo_inscricao_inicio(3i)"=>"1",
"periodo_inscricao_inicio(2i)"=>"3",
> "periodo_inscricao_inicio(1i)"=>"2010",
"periodo_inscricao_fim(3i)"=>"1",
> "periodo_inscricao_fim(2i)"=>"3",
"periodo_inscricao_fim(1i)"=>"2010"},
> "ementa"=>{"descricao"=>"test"},
"commit"=>"Submit"}
   [4;36;1mSQL (1.0ms) [0m    [0;1mBEGIN [0m

   [4;35;1mSQL (2.0ms) [0m    [0mINSERT INTO "cursos"
("nome", "descricao",
> "periodo_inscricao_inicio", "periodo_inscricao_fim",
"created_at",
> "updated_at") VALUES(E''Test'',
E''test'', ''2010-03-01'',
''2010-03-01'',
> ''2010-03-01 03:46:32.756995'', ''2010-03-01
03:46:32.756995'') RETURNING
> "id" [0m
   [4;36;1mSQL (2.0ms) [0m    [0;1mCOMMIT [0m

-- 
Ramon de Paula Marques
Estudante de Engenharia de Computação - UFG

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