routes.rb

ActionController::Routing::Routes.draw do |map|
  map.devise_for :users
  map.resources :users, :only => [:new, :create] do |users|
    users.resources :task_lists, :controller => 'users/task_lists'
  end
  map.root :controller => 'homepage'
end

task_libs_controller.rb

class Users::TaskListsController < InheritedResources::Base
  defaults :route_prefix => ''
  before_filter :authenticate_user!
  belongs_to :user
  
  protected
    def begin_of_association_chain
      @current_user
    end
end