motor_present.py

class MessagesHandler(tornado.web.RequestHandler):
    @tornado.web.asynchronous
    @tornado.gen.engine
    def get(self):
        db = self.settings['db']
        rb = []
        cursor = db.messages.find().sort([('_id', -1)])
        while (yield cursor.fetch_next)
            message = cursor.next_object()
            rb.append({
                'id': message['_id'], 
                'msg': message['msg']
            })
        self.finish({"data": rb})