Dowser: "bad argument to internal function"

Hi all!

I'm trying out Dowser, it's really cool but I'm stuck with a little problem, and I couldn't find anything helpful on Google, so here I am.. ^^;

I'm running a CherryPy+SQLAlchemy application.. It works normally, except that when I enable Dowser (that is, after I call dowser.Root()), now and then I get exceptions like:

SystemError: ../Objects/tupleobject.c:809: bad argument to internal function

on innocent-looking istructions, such as accessing a SQLA-mapped field.. Relevant part of a traceback:

  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/attributes.py", line 158, in __get__
    return self.impl.get(instance_state(instance), instance_dict(instance))
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/attributes.py", line 377, in get
    value = callable_()
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/strategies.py", line 586, in __call__
    result = q.all()
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/query.py", line 1267, in all
    return list(self)
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/query.py", line 1422, in instances
    rows = [process[0](context, row) for row in fetch]
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/query.py", line 2032, in main
    return _instance(row, None)
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/mapper.py", line 1653, in _instance
    identitykey = identity_key(row)
  File "/usr/local/lib/python2.6/dist-packages/SQLAlchemy-0.5.8-py2.6.egg/sqlalchemy/orm/mapper.py", line 1594, in identity_key
    return (identity_class, tuple(row[column] for column in pk_cols))

Could this be related to the Dowser thread, accessing the garbage collector? Any hint on what I could check out?

I'm running Python 2.6.2 on Xubuntu Jaunty.

Thanks for your attention!

ansaurus

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Dowser: "bad argument to internal function"

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