在自己的机器的上试跑下，结果出现错误sqlalchemy.exc.InvalidRequestError

[ragnraok]

数据库使用的是SQLite一开始像这里说的一样，改成"flask.ext"之后能够建立数据库，然后执行python run runserver之后，出现以下错误：

sqlalchemy.exc.InvalidRequestError
InvalidRequestError: On relationship Topic.notify, 'dynamic' loaders cannot be used with many-to-one/one-to-one relationships and/or uselist=False.

Traceback (most recent call last):
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/flask/app.py", line 1701, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/flask/app.py", line 1689, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/flask/app.py", line 1687, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/flask/app.py", line 1360, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/flask/app.py", line 1358, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/flask/app.py", line 1344, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/home/ragnarok/Resource/flask/Feather/feather/views/topic.py", line 82, in index
    (usercount, topiccount, replycount) = get_sitestatus()
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/flask_cache/__init__.py", line 216, in decorated_function
    rv = f(*args, **kwargs)
  File "/home/ragnarok/Resource/flask/Feather/feather/views/topic.py", line 40, in get_sitestatus
    usercount = User.query.count()
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/flask_sqlalchemy.py", line 394, in __get__
    mapper = orm.class_mapper(type)
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/sqlalchemy/orm/util.py", line 1128, in class_mapper
    mapper = _inspect_mapped_class(class_, configure=configure)
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/sqlalchemy/orm/util.py", line 1061, in _inspect_mapped_class
    mapperlib.configure_mappers()
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 2048, in configure_mappers
    mapper._post_configure_properties()
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/sqlalchemy/orm/mapper.py", line 1233, in _post_configure_properties
    prop.post_instrument_class(self)
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/sqlalchemy/orm/interfaces.py", line 461, in post_instrument_class
    self.strategy.init_class_attribute(mapper)
  File "/home/ragnarok/Resource/flask/Feather/venv/lib/python2.7/site-packages/sqlalchemy/orm/dynamic.py", line 30, in init_class_attribute
    "uselist=False." % self.parent_property)
InvalidRequestError: On relationship Topic.notify, 'dynamic' loaders cannot be used with many-to-one/one-to-one relationships and/or uselist=False.

系统环境：

$ uname -a
Linux ragnarok-Aspire-4741 3.5.0-17-generic #28-Ubuntu SMP Tue Oct 9 19:31:23 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

[yetone]

对不起，这是我的错误，由于当初构建时考虑不慎，故在大量运用多对多映射，所以这个版本已经废弃，我准备用 Tornado 重构之，由于接了个外包，所以迟迟未能动手，造成的麻烦还请见谅。

[ragnraok]

Soga....

[hit9]

好吧，跑出这个错误了我才看到