Rails3 -- Replacement for ActionController::Base.relative_url_root?

I have a post on stackoverflow which outlines the problem I am having:   ruby on rails - What is the replacement for ActionController::Base.relative_url_root? - Stack Overflow

In short, I ported a rails 2.x to rails3 and started getting a deprecation warning for using ActionController::Base.relative_url_root. I switched to using config.action_controller.relative_url_root and while any calls to external resources (like css/jss/images) does have the url root appended, none of my routes do.

Is config.action_controller.relative_url_root the right replacements for ActionController::Base.relative_url_root?