What is the replacement for ActionController::Base.relative_url_root?

Question

I am porting a 2.x rails app to rails3; we\'ll call it foo-app. Foo-app is one section of a larger rails app and lives at main_rails_app.com/foo-app. Previously we just set

Answer 1

If you deploy via Passenger, use the RackBaseURI directive: http://www.modrails.com/documentation/Users%20guide%20Apache.html#RackBaseURI

Otherwise, you can wrap the run statement in your config.ru with the following block:

map ActionController::Base.config.relative_url_root || "/" do
  run FooApp::Application
end

Then you only have to set the environment variable RAILS_RELATIVE_URL_ROOT to "/foo-app". This will even apply to routes set in gems or plugins.

Warning: do not mix these two solutions.