class ActiveSupport::EncryptedFile

def writing(contents)
  tmp_file = "#{Process.pid}.#{content_path.basename.to_s.chomp('.enc')}"
  tmp_path = Pathname.new File.join(Dir.tmpdir, tmp_file)
  tmp_path.binwrite contents
  yield tmp_path
  updated_contents = tmp_path.binread
  write(updated_contents) if updated_contents != contents
ensure
  FileUtils.rm(tmp_path) if tmp_path&.exist?
end