facebook_asset_path.rb

module ActionView

  module Helpers
    module AssetTagHelper
      def compute_public_path_with_facebooker(*args)
        public_path=compute_public_path_without_facebooker(*args)
        if public_path.starts_with?(ActionController::Base.asset_host)
          str=ActionController::Base.asset_host
          str += "/" unless str.ends_with?("/")
          public_path.gsub(/#{Regexp.escape(ActionController::Base.asset_host)}#{@controller.request.relative_url_root}\//,str)
        else
          public_path
        end
      end

      alias_method_chain :compute_public_path, :facebooker
    end
  end

end