I'd like to get notified (either by checking the session or through an
event handler) when an attribute changes value. None of the options I've
figured out so far work for this. Thanks for the help!
*Event Handler*
event.listen(Object.attribute, 'set', event_handler)
this method fires before the Object gets all the attributes from the
database so the Object isn't really usable.
*Session.Dirty*
session.dirty: I can check the updated object before I commit it but I
can't figure out a way to get the oldvalue here. history doesn't seem to
provide an access point.
for o in session.dirty:
if o.is_modified():
inspect(o).attrs.attribute.history
SQLAlchemy==0.8.0b2
postgres (PostgreSQL) 9.2.3
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