如何在find()之后使用mongokit更新对象

Question

@connection.register 
class User(Document):
    __database__ = 'foo' 
    __collection__ = 'bar' 
    structure = {
    '_id' : ObjectId,
    'Email' : basestring,       
}

col = connection['uplace']['user']
user = col.find()[2]
user2 = User(user)
user2['Email'] = '[e-mail]'
#connection.register([user])
#user['Wall'][1]['Reply'][0]['Message'] = 'test new message'
#print user
user2.save()

然而，当我运行这个，我收到对象，它是我的UserDocument的一个实例。但是会引发以下异常:

    server_version = tuple(self.connection.server_info()['version'].split("."))
  File "/Library/Python/2.7/site-packages/mongokit/document.py", line 628, in __getattribute__
    raise ConnectionError('No collection found') 
mongokit.mongo_exceptions.ConnectionError: No collection found

Answer 1

正确的方法是:

user2 = col.User(user)
user2.pop('_id')  # you should remove the _id or saving user2 will replace user
user2["Email"] = "[e-mail]"
user2.save()