I ran into this too. I think it's the same issue. See:
http://pylonshq.com/project/pylonshq/ticket/620

On Oct 19, 4:24 pm, Mariano Mara <[email protected]> wrote:
> I'm building a data warehouse front end with pylons and for this, I
> found very useful SqlAlchemy's reflection feature. I place all the
> mappers in reports/models/__init__.py following the stub I found right
> there when I started the project. I played a little bit with paster
> shell and so far it's working great. The thing is that I quickly
> decided to start building my tests before my model gets bigger and
> when I try to run it (I didin't even added a proper test) I hit the
> following error:
>
> ArgumentError: Class '<class 'repotrs.model.User'>' already has a
> primary mapper defined. Use non_primary=True to create a non primary
> Mapper.  clear_mappers() will remove *all* current mappers from all
> classes.
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