gistfile1.rb

# In .irbrc
# then when you want to play with generating urls from the console, 
# just call make_urls and you're set.

def make_urls
  self.class.class_eval do
    include ActionController::UrlWriter
    mattr_accessor :default_url_options
  end
  self.class.default_url_options = {
    :host => 'localhost',
    :protocol => 'http://',
    :port => 3000
  }

end