well can you distill it into a small test case...it seems suspect that
"UPDATE" would break. more likely is, __init__ doesn't work correctly or
perhaps history events fail.
phrrn...@googlemail.com wrote:
>
> I found the problem: it is with the instrumentation_finders stuff you
> helped us with months ago (see below). The problem can be reproduced
> with this:
>
> class DummyMapperExtension(MapperExtension):
> pass
>
> mapper(ModelPresentValue, model_present_value,
> extension=DummyMapperExtension())
>
> If the instrumentation hook is put in and you use a mapper extension
> (even a dummy one) then the session update code stops working.
>
> instrumentation + mapper_extension => fail
> instrumentation only => works
> mapper_extension only => works
>
> I tried debugging the instrumentation_find stuff before but didn't
> make much progress. I will open up a ticket on trac (if there isn't
> one there already)
>
>
> pjjH
>
> # Set docstrings of attributes to the empty string, in order to avoid
> # ugly-looking stuff that would otherwise appear as default.
> class AttachNotesAsDocstring(interfaces.InstrumentationManager):
> def instrument_attribute(self, class_, key, attr):
> if isinstance(attr.property, properties.ColumnProperty):
> if hasattr(attr.property.columns[0], 'info'):
> attr.__doc__ = attr.property.columns[0].info.get
> ('notes')
> else:
> attr.__doc__ = ''
>
> # We get a weird error from SQLAlchemy when we have customized
> # instrumentation and try to cog a file:
> #
> # AttributeError: 'ColumnProperty' object has no attribute
> 'strategy'
> #
> # As a workaround, we do not attempt to do any fancy instrumentation
> # if the cog module has been imported.
> if not 'cog' in sys.modules:
> sqlalchemy.orm.attributes.instrumentation_finders.append(
> lambda cls: AttachNotesAsDocstring)
>
>
>
>
>
> >
>
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