nested namespaces with nested resources

Hello.

I have a problem with url_for resource.

My models:

class QuestionLibrary::Group < ActiveRecord::Base class QuestionLibrary::Competence < ActiveRecord::Base   set_table_name "question_library_competences"   belongs_to :group   has_many :questions end

My controllers: class Admin::QuestionLibrary::GroupsController < ApplicationController class Admin::QuestionLibrary::CompetencesController < ApplicationController

My routes:

map.namespace :admin do |admin|   admin.namespace :question_library do |question_library|     question_library.resources :groups, :collection => { :reoder => :post } do |groups|       groups.resources :competences, :collection => { :reoder => :post } do |competences|         competences.resources :questions       end     end   end end

My view:

<% form_for [:admin. @group, @competence] do |f| %>

fails with:

undefined method `admin_question_library_group_question_library_competences_path'

In cause of url_for adds namespace prefix to each model. May I fix it without specifying :url arg to url_for => ... ?