it means mapper compilation has failed or you're doing something
internally on an attribute before mappers have been compiled. mappers can
be compiled explicitly by saying compile_mappers().
Bruno Zanchet wrote:
>
> Hi all,
>
> We're facing a weird, (apparently) hard to reproduce bug. When
> accessing a property of an object:
> [...]
> sig.update('u=%s;%s;%s' % (token.user.id, token.user.yuid,
> token.user.guid))
>
> File "/home/y/lib/python2.5/site-packages/sqlalchemy/orm/
> attributes.py", line 159, in __get__
> return self.impl.get(instance_state(instance))
>
> AttributeError: 'NoneType' object has no attribute 'get'
>
> User is a class which extends declarative_base().
>
> The "token.user.id" statement is triggering the exception. It's
> SQLAlchemy 0.5.2. The same code runs just fine with 0.5.0rc4. I didn't
> dig deeper on this, yet, but... any ideas on what might be causing
> this?
>
> Bruno
>
> >
>
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