[PATCH] #controller_path returns empty string in Ruby 1.8.7

Actually it returns an empty string in this particular code:

require 'rubygems'
require 'bundler'
Bundler.setup
Bundler.require
require 'action_controller'

name = 'ExamplesController'
class_name = name.camelize
klass = Class.new(ActionController::Base)
Object.const_set(class_name, klass)
controller = klass.new

p controller.class.name
=> "ExamplesController" in Ruby 1.8.7 and 1.9.1

p controller.controller_path
=> "" in Ruby 1.8.7
=> "examples" in Ruby 1.9.1

This problem occurs only in Rails 3.0 (I'm using master branch - that's why bundler is used here). In Rails 2.3.5 it works correctly.