original_filename (ActionController::UploadedFile)

    # File lib/action_controller/request.rb, line 851
        def original_filename
          unless defined? @original_filename
            @original_filename =
              unless original_path.blank?
                if original_path =~ /^(?:.*[:\\\/])?(.*)/m
                  $1
                else
                  File.basename original_path
                end
              end
          end
          @original_filename
        end