Thanks for the suggestions. The "convert to list" approach sounded
appealing, but I had to get back a queryset since this was for an RSS
feed.
After reading up more, finally decided it might actually make more
sense to go with a bit of denormalization and create a "combined_date"
field on the model, with a custom save() method that keeps the right
thing in that new field.
def save(self):
if self.completed == True:
self.combined_date = self.completed_date
else:
self.combined_date = self.created_date
super(Item, self).save()
That turned out to be trivial, gave me a single date field to sort on,
and kept everything in a queryset.
Thanks,
./s
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