class ActionView::Helpers::Tags::FileField

def render
  options = @options.stringify_keys
  if options.fetch("include_hidden", true)
    add_default_name_and_id(options)
    options[:type] = "file"
    tag("input", name: options["name"], type: "hidden", value: "") + tag("input", options)
  else
    options.delete("include_hidden")
    @options = options
    super
  end
end