Rails - Feb 2009 - THREE MODELS PROBLEM IN 'NEW' ACTION

Hello,

I have this problem :

When I use three models, and associate them, then, my ''new''
action need more data to work, How can I resolv it, or I do it in the right way
?

Thanks

Jose.


******************** my models *************************

class Libro < ActiveRecord::Base
  has_many :lecciones
end

class Leccion < ActiveRecord::Base
  has_many :vocabularios
  belongs_to :libro
end

class Vocabulario < ActiveRecord::Base
  belongs_to :leccion
  belongs_to :libro
end

**************** routes.rb ****************************

ActionController::Routing::Routes.draw do |map|
  map.resources :vocabularios

  map.resources :lecciones
  
  map.resources :libros

  map.resources :libros, :has_many => :lecciones

  map.resources :libros do |libro|
     libro.resources :lecciones do |leccion|
       leccion.resources :vocabularios
     end
  end

  map.connect '':controller/:action/:id''
  map.connect '':controller/:action/:id.:format''
end

*************** my controllers *****************************

class VocabulariosController < ApplicationController

  def new
    @libro = Libro.find(params[:libro_id])
    @leccion = @libro.lecciones.find(params[:leccion_id])
    @vocabulario = @leccion.vocabularios.build(params[:vocabulario])

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @vocabulario }
    end
  end

  def create
    @libro = Libro.find(params[:libro_id])
    @leccion = @libro.lecciones.find(params[:leccion_id])
    @vocabulario = @leccion.vocabularios.build(params[:vocabulario])

    # Here ''@vocabulario'' never have ''libro''
and write in the
    # database ''NULL''
    # why it never works ?
  
    # i need to put something like :
    
    # @vocabulario.libro = @libro

    # then the insert in database works fine, WHY ?
    # is this ok ?
  
    if @vocabulario.save
      redirect_to libro_leccion_vocabulario_url(@libro, @leccion, @vocabulario)
    else
      render :action => "new"
    end

  end

end



      

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