Question

我是webapp2的新手。我试图让自定义用户模型与身份验证系统兼容。但每次我的程序调用get_user_by_password时都会引发TypeError：无法连接'str'和'NoneType'对象。我甚至尝试用自定义模型运行某些elses应用程序，它也不会工作。例如，我对此项目https://gist.github.com/jgeewax/2942374收到了同样的错误。

Traceback (most recent call last):
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1535, in __call__
rv = self.handle_exception(request, response, e)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1529, in __call__
rv = self.router.dispatch(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1278, in   default_dispatcher
return route.handler_adapter(request, response)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 1102, in __call__
return handler.dispatch()
File "D:\STUDIA\Semestr 10\Praca Magisterska\Projekty\test\main.py", line 83, in dispatch
response = super(BaseHandler, self).dispatch()
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 572, in dispatch
return self.handle_exception(e, self.app.debug)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2.py", line 570, in dispatch
return method(*args, **kwargs)
File "D:\STUDIA\Semestr 10\Praca Magisterska\Projekty\test\main.py", line 141, in post
self.auth.get_user_by_password(username, password)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2_extras\auth.py", line 459, in get_user_by_password
silent=silent)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2_extras\auth.py", line 278, in validate_password
return self.get_user_by_auth_password(auth_id, password, silent=silent)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2_extras\auth.py", line 151, in get_user_by_auth_password
return self.user_to_dict(user)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2_extras\auth.py", line 207, in user_to_dict
user_dict = dict((a, getattr(user, a)) for a in self.user_attributes)
File "C:\Program Files (x86)\Google\google_appengine\lib\webapp2-2.5.2\webapp2_extras\auth.py", line 207, in <genexpr>
user_dict = dict((a, getattr(user, a)) for a in self.user_attributes)
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\db\__init__.py", line 604, in __get__
return getattr(model_instance, self._attr_name())
File "C:\Program Files (x86)\Google\google_appengine\google\appengine\ext\db\__init__.py", line 752, in _attr_name
return '_' + self.name
TypeError: cannot concatenate 'str' and 'NoneType' objects

Answer 1

该错误说明您无法对字符串（'_'）和值为None的对象执行字符串连接。这意味着此时self.name为None，因此您需要跟踪定义self.name的位置，以及是否正确存储值

如果您仍想连接这两个值，请考虑使用字符串格式而不是“+”符号。

如果return '_%s' % self.name值为'_None'，则self.name会返回None

Webapp2 get_user_by_password引发TypeError：无法连接'str'和'NoneType'对象

1 个答案: