Rails 3.1 url helper in sprockets with relative_url_root

gistfile1.rb

# So I was trying to use named route helpers in sprockets, and the app was hosted in a subdirectory.
# This is what I came up with. Please share your hackeries.
#
# using named routes in sprocket Rails 3.1
# you can use this in app/assets/javascripts/bam.js.erb
# or any other erb sprocket asset

Rails.application.routes.url_helpers.bam_path(
  :script_name => ApplicationController.config.relative_url_root
)