def put(self, message_id):
title = request.form.get('title')
body = request.form.get('body')
message = MessageModel.find_message_by_id(message_id)
if message is None:
message = MessageModel(title, body, author_id)
else:
if title:
message.title = title
if body:
message.body = body
message.save_to_db()
return {'message': message.to_json()}
