[Sqlalchemy-tickets] Issue #3651: Got "AttributeError: uselist" when using association proxy and deriving ConcreteBase (zzzeek/sqlalchemy)

[Brian P. <iss...@bi...>]

New issue 3651: Got "AttributeError: uselist" when using association proxy and deriving ConcreteBase
https://bitbucket.org/zzzeek/sqlalchemy/issues/3651/got-attributeerror-uselist-when-using

Brian Peterson:

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "<string>", line 4, in __init__
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/orm/state.py", line 306, in _initialize_instance
    manager.dispatch.init_failure(self, args, kwargs)
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 60, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/util/compat.py", line 184, in reraise
    raise value
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/orm/state.py", line 303, in _initialize_instance
    return manager.original_init(*mixed[1:], **kwargs)
  File "/home/brian/code/pwm/flask-permissions-ex/ex/database.py", line 28, in __init__
    UserMixin.__init__(self, roles)
  File "<string>", line 6, in __init__
  File "/home/brian/code/pwm/flask-permissions/flask_permissions/models.py", line 125, in __init__
    self.roles = [default_role]
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/ext/associationproxy.py", line 272, in __set__
    if self.scalar:
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 754, in __get__
    obj.__dict__[self.__name__] = result = self.fget(obj)
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/ext/associationproxy.py", line 232, in scalar
    scalar = not self._get_property().uselist
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 840, in __getattr__
    return self._fallback_getattr(key)
  File "/home/brian/.virtualenvs/flask-permissions-ex/lib/python3.4/site-packages/sqlalchemy/util/langhelpers.py", line 818, in _fallback_getattr
    raise AttributeError(key)
AttributeError: uselist