class method self.metals

# File railties/lib/rails/rack/metal.rb, line 13
      def self.metals
        matcher = /#{Regexp.escape('/app/metal/')}(.*)\.rb\Z/
        metal_glob = metal_paths.map{ |base| "#{base}/**/*.rb" }
        all_metals = {}

        metal_glob.each do |glob|
          Dir[glob].sort.map do |file|
            file = file.match(matcher)[1]
            all_metals[file.camelize] = file
          end
        end

        load_list = requested_metals || all_metals.keys

        load_list.map do |requested_metal|
          if metal = all_metals[requested_metal]
            require_dependency metal
            requested_metal.constantize
          end
        end.compact
      end