Snippet to include JQuery from Google in production and locally in dev

bundle_helper.rb

module BundleHelper
  def javascript_dev(*sources)
    output = ""
    sources = sources.to_a
    sources.each do |pair|
      output << javascript_src_tag(Rails.env.development? ? "dev/#{pair[0]}" : pair[1], {})
    end
    output.html_safe
  end
end

layout.html.haml

!!! XML
!!!
%html{ html_attrs }
  %head
    = javascript_dev ['jquery-1.4.2', "http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"]