On Feb 24, 2012, at 12:37 PM, Jakob D. wrote:
> I wrote a small script to clean up the db of old entries.
>
> So when I do obj.delete() I get this error. I also do a session.update(obj)
> right before to make sure the object is present in the session.
>
> File "deletor.py", line 95, in delete
> m.delete()
> File "/usr/lib/python2.5/site-packages/elixir/entity.py", line 963, in
> delete
> return object_session(self).delete(self, *args, **kwargs)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/session.py", line
> 961, in delete
> for c, m in _cascade_iterator('delete', instance):
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/session.py", line
> 1253, in _cascade_iterator
> for (o, m) in mapper.cascade_iterator(cascade, instance._state, **kwargs):
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/mapper.py", line
> 1335, in cascade_iterator
> instance, instance_mapper, corresponding_state = iterator.next()
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/properties.py", line
> 451, in cascade_iterator
> instances = attributes.get_as_list(state, self.key, passive=passive)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/attributes.py", line
> 1151, in get_as_list
> x = attr.get(state, passive=passive)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/attributes.py", line
> 279, in get
> value = callable_()
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/strategies.py", line
> 466, in __call__
> result = q.all()
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/query.py", line 878,
> in all
> return list(self)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/query.py", line
> 1017, in iterate_instances
> context.attributes.get(('populating_mapper', ii),
> _state_mapper(ii))._post_instance(context, ii)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/mapper.py", line
> 1517, in _post_instance
> p(state.obj(), **kwargs)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/mapper.py", line
> 1547, in post_execute
> self.populate_instance(selectcontext, instance, row, isnew=False,
> instancekey=identitykey, ispostselect=True, only_load_props=only_load_props)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/mapper.py", line
> 1484, in populate_instance
> (newpop, existingpop, post_proc) = selectcontext.exec_with_path(self,
> prop.key, prop.create_row_processor, selectcontext, self, row)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/query.py", line
> 1703, in exec_with_path
> return fn(*args, **kwargs)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/interfaces.py", line
> 532, in create_row_processor
> return
> self._get_context_strategy(selectcontext).create_row_processor(selectcontext,
> mapper, row)
> File "/var/lib/python-support/python2.5/sqlalchemy/orm/strategies.py", line
> 75, in create_row_processor
> elif self.columns[0] in row:
> TypeError: argument of type 'NoneType' is not iterable
>
>
> Can I get a hint to what might be wrong?
I can give you a hint if you give us one .... a short, self-contained and
runnable test script illustrating how you're getting it to do this ?
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