Flowdock

Write URLs from arbitrary places in your codebase, such as your mailers.

Example: 

  class MyMailer
    include ActionController::UrlWriter
    default_url_options[:host] = 'www.basecamphq.com'

    def signup_url(token)
      url_for(:controller => 'signup', action => 'index', :token => token)
    end
 end

In addition to providing url_for, named routes are also accessible after including UrlWriter.

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January 6, 2011 - (>= v3.0.0)
1 thank

Accessing URL helpers in Rails 3

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/

March 2, 2011
0 thanks

How to deal with Missing host to link to!

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