It would appear as though a mapped class, I'm assuming called "Preprocess", is 
being interpreted as an instance state, an internal ORM construct that would 
normally be attached to the mapped object.    I'm not familiar offhand with any 
documented usage which could cause that.   If you were to somehow get your 
mapped object injected into the identity map incorrectly, though you'd have to 
try fairly hard to pull that off since it guards against incorrect incoming 
state. 

On May 3, 2011, at 4:12 AM, Torsten Landschoff wrote:

> Hi *,
> 
> has somebody seen this error and maybe an idea how I ended up triggering
> it? ;-)
> 
> File 
> "/home/dynamore/loco2/deploy/linux64_rhel5.4/build/pyi.linux2/loco2/outPYZ1.pyz/sqlalchemy.orm.session",
>  line 746, in close
>  File 
> "/home/dynamore/loco2/deploy/linux64_rhel5.4/build/pyi.linux2/loco2/outPYZ1.pyz/sqlalchemy.orm.session",
>  line 766, in expunge_all
> AttributeError: 'Preprocess' object has no attribute 'detach'
> 
> This is for SQLAlchemy 0.6.5 as I just noticed - I have to update the
> deploy machine.
> 
> Greetings, Torsten
> 
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