Jorge Vargas schrieb:
> I'm trying to figure out how things like SAclass.query().something are
> setup in TG1, in order to see if it's possible to provide this
> functionality for TG2. in which the default is
> DBSession.query(SAclass)

As was already answered here, the answer is Session.mapper.

However, I don't recommend porting the TG 1 SQLAlchemy setup to TG 2 
since it's actually a bit outdated. Instead, TG 2 should adopt the new 
declarative usage with its simpler mapper, and maybe add some 
functionality to our own classes. As Mark suggested, we should probably 
invent a common base class for SQLAlchemy classes in TurboGears. We 
could then also add some other gimmicks such as jsonification.

See also these comments over on the SQLAlchemy list:
http://groups.google.com/group/sqlalchemy/browse_thread/thread/bc7ecb50a4ef597c

-- Christoph

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