I posted this in the users group but didn't get any response, so I'm
bringing it here.
Is there any particular reason why it's assumed you won't be performing a
Max on a CharField?
I tried to create the following QuerySet I get an error out of
convert_values() of BaseDatabaseOperations in
django/db/backends/__init__.py:
Document.objects.filter(documentType=1,
event__eventType=3).annotate(event_date=Max('event__start_date'),
subcommittee=Max('event__subcommittee__name')).order_by('subcommittee',
'event_date')
The reason why I performed a Max on the subcommittee name is that the
relation between Document and Event is actually a many to many, but I
enforce this particular documentType to only once per Event.
The fix is easy. Add any character based field types to the last elif in
convert_values(). I plan on submitting a patch unless there's a compelling
reason not to
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