I've been upgradings an app to Rails 3 and it took me a bit to find this-

If you were using

include ActionController::UrlWriter

to get the url helpers in rails 2, you should switch to

include Rails.application.routes.url_helpers 

for Rails 3

From: http://snipplr.com/view/37063/to-access-url-helpers-urlfor-etc-from-rails-console-rails-3/

You just need to define default_url_options[:host] in your class. The easiest way to do it:

class SomeClass include ActionController::UrlWriter default_url_options[:host] = YourApp::Application.config.action_mailer.default_url_options[:host]

def some_method

some_superb_url(maybe_even_some_variable_here) end end