多个ndb.用python在Google应用引擎中建模类

Question

我是GAE和Python的新手，我正在学习谷歌提供的教程，但是当我尝试在同一文件中创建多个模型类时，问题就来了。如果我添加这样的内容:

class Greeting(ndb.Model):
    """Models an individual Guestbook entry with author, content, and date."""
    author = ndb.UserProperty()
    content = ndb.StringProperty(indexed=False)
    email = ndb.StringProperty()
    date = ndb.DateTimeProperty(auto_now_add=True)
    colours = ndb.StringProperty(repeated=True)
class UserInformation(ndb.model):
    username = ndb.UserProperty()
    firstname = ndb.StringProperty(required=True)
    lastname = ndb.StringProperty(required=True)
    telephone = ndb.IntegerProperty()

我得到以下错误信息

Traceback (most recent call last):
  File "C:Program Files (x86)Googlegoogle_appenginegoogleappengineruntimewsgi.py", line 239, in Handle
    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())
  File "C:Program Files (x86)Googlegoogle_appenginegoogleappengineruntimewsgi.py", line 298, in _LoadHandler
    handler, path, err = LoadObject(self._handler)
  File "C:Program Files (x86)Googlegoogle_appenginegoogleappengineruntimewsgi.py", line 84, in LoadObject
    obj = __import__(path[0])
  File "C:Python27gaelistpropertymain.py", line 37, in <module>
    class UserInformation(ndb.model):
TypeError: Error when calling the metaclass bases
    module.__init__() takes at most 2 arguments (3 given)

如果我将UserInformation类放入第二个文件并尝试将其导入到main.py中，我将再次得到类似的错误消息。

我的问题是什么是最好的方式来处理多个ndb。模型类在GAE使用Python?

如有任何帮助，不胜感激

Answer 1

你打错了，换行:

class UserInformation(ndb.model):

to(注意大写的M):

class UserInformation(ndb.Model):