SQLAlchemy 从数据库读出纪录怎么输出 json

[yakczh]

照http://simplectic.com/blog/2014/flask-todomvc-sqlalchemy/　上面的例子　要对每个表字段挨个配置一遍
def to_json(self):
return {
"id": self.id,
"title": self.title,
"order": self.order,
"completed": self.completed}

def from_json(self, source):
if 'title' in source:
self.title = source['title']
if 'order' in source:
self.order = source['order']
if 'completed' in source:
self.completed = source['completed']
除了这种方式，还有别的简单一点的办法吗？