Rails (3.0.x): easily namespace routes for entire app

routes.rb

MyApp::Application.routes.draw do

  my_draw = Proc.new do

    get "widgets" => "widgets#index"

    # add other routes here

  end

  # I chose to name my environment variable 'RAILS_RELATIVE_URL_ROOT' but it can
  # be anything you want.
  # 
  # In production I was deploying my Rails app (as a WAR, thanks to the warbler gem) to a Tomcat server.
  # Tomcat associates applications to the name of the directory that gets created when a WAR file is
  # is exploded, so if my WAR was named 'myapp.war' then I would end up with /path/to/tomcat/webapps/myapp
  # which could be accessed via a browser at http://<server name>:<port>/myapp
  #
  # In development I wanted to test my app in a similar scenario but WEBrick (or whatever  you use)
  # doesn't work that way. So, I'd set the env. variable to '/myapp' and then when I ran my Rails app
  # using "rails s"..I could access it as http://localhost:3000/myapp
  if Rails.env != 'production' && ENV['RAILS_RELATIVE_URL_ROOT']
    puts "drawing routes inside scope: #{ENV['RAILS_RELATIVE_URL_ROOT']}"
    scope ENV['RAILS_RELATIVE_URL_ROOT'] do
      my_draw.call
    end
  else
    my_draw.call
  end
end