class ActiveSupport::EncryptedFile

def writing(contents)
  Tempfile.create(["", "-" + content_path.basename.to_s.chomp(".enc")]) do |tmp_file|
    tmp_path = Pathname.new(tmp_file)
    tmp_path.binwrite contents
    yield tmp_path
    updated_contents = tmp_path.binread
    write(updated_contents) if updated_contents != contents
  end
end