Middleman Rails Assets config

config.rb

# config.rb

after_configuration do
  if defined?(RailsAssets)
    RailsAssets.load_paths.each do |path|
      sprockets.append_path path  unless sprockets.paths.include? path
      Dir[File.join(path, '*')].select do |contents|
        File.file? contents
      end.map do |file|
        Pathname.new File.basename file
      end.each do |asset|
        sprockets.import_asset asset unless sprockets.imported_assets.map(&:logical_path).include? asset
      end
    end
  end
end