A short discussion from #sqlalchemy at freenode:
[09:48] < filip> hi, could somebody please run
http://filip.eu.org/sqlawtf.py and tell me whether an exception is being
raised?
[09:49] < filip> because on my machines it is, and on zzzeek's it is
not...
[09:55] < stepz_> filip: I looked at that a bit, it's some dict ordering
thing
[09:56] < stepz_> 50:50 chance of it failing depending on exact system
config
[09:56] < stepz_> small modifications, or just repeatedly running that
in a single interpreter will make it fail
[09:58] < stepz_> the issue is that while Task.result.impl is not
DeliveryTask.result.impl, Task.result.impl.extensions is
DeliveryTask.result.impl.extensions
[09:58] < stepz_> I didn't find at a glance where
ScalarAttributeImpl.extensions gets populated so couldn't track the
reason
[09:59] < stepz_> but maybe jek or zzzeek can make something of that
[09:59] < filip> stepz_: it's done this way according to zzzeek's
suggestion from the ML
[09:59] < jezier> stepz_: i've traced filips code to
sqlalchemy/orm/strategies.py _register_attribute
[10:00] < jezier> stepz_: in for m in mapper.polymorphic_iterator(): you
get random order i think
bye,
Filip Zyzniewski
Tefnet
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