extract_format

# File actionpack/lib/action_controller/polymorphic_routes.rb, line 175
      def extract_format(record_or_hash_or_array, options)
        if options[:action].to_s == "formatted" && record_or_hash_or_array.is_a?(Array)
          record_or_hash_or_array.pop
        elsif options[:format]
          options[:format]
        else
          nil
        end
      end