使用python在谷歌应用引擎中的多个ndb.model类

Question

我是GAE和Python的新手,我正在研究google提供的教程,但是当我尝试在同一个文件中创建多个模型类时问题就出现了.如果我添加这样的东西:

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()

我收到以下错误消息

Traceback (most recent call last):

  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 239, in Handle

    handler = _config_handle.add_wsgi_middleware(self._LoadHandler())

  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 298, in _LoadHandler

    handler, path, err = LoadObject(self._handler)

  File "C:\Program Files (x86)\Google\google_appengine\google\appengine\runtime\wsgi.py", line 84, in LoadObject

    obj = __import__(path[0])

  File "C:\Python27\gae\listproperty\main.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main.py,我会再次收到类似的错误消息.

我的问题是使用Python在GAE中处理多个ndb.model类的最佳方法是什么？

任何帮助,将不胜感激

Answer 1

你有一个错字,改变行:

class UserInformation(ndb.model):

(注意资本M):

class UserInformation(ndb.Model):

它应该工作正常.