Actually, I tried to do it that way but I never got it working. Not sure
what is different now but this is what I have working for me now:
qs = qs.values('make').annotate(model_count=Count('model', distinct=True)).
annotate(
more_than_one_model=Case(
When(model_count__gt=1, then=Value('yes')),
default=Value('no'),
output_field=CharField()
)
)
Thanks for leading me back on the right track.
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