lib/echo_uploads/writable_file.rb
def method_missing(meth, *args)
      if @tempfile.respond_to? meth
        @tempfile.send meth, *args
      else
        super meth, *args
      end
    end
def method_missing(meth, *args)
      if @tempfile.respond_to? meth
        @tempfile.send meth, *args
      else
        super meth, *args
      end
    end
Takes an EchoUploads::File.