How to send URLs in emails specific to environment?

Using the code generated by restful_authentication, we usually get 'localhost' as the URL in the sign up and activation mails. I am trying to create something like this instead:

def signup_notification(user, host)
  setup_email(user)
  @subject    += 'Please activate your new account'

  @body[:url]  = "http://#{host}/activate/#{user.activation_code}"
end

However, since the actual call to deliver the mail is in an Observer, I can't do this:

UserMailer.deliver_signup_notification(user, request.host_with_port)

Since the request method is not available in models. What is the best way to go about doing this?

I thought about storing URLs per domain in a YAML file and then loading it on startup but then the ports may change, so it wouldn't work.

Alternatively, I thought about creating a static class variable somewhere that is set upon loading up the application, but I don't know how to go about doing this. Is the request method available for initializers?

Solution

try current_request plugin, described at http://codeshooter.wordpress.com/2009/08/

worked for me