Sorry to follow up on my own drivel, but I think I've found a solution
in the fine django docs:
obs =
Observation.objects.filter(observer=o.id,location__location_area__area_country__country_abbrev=country_code).values("bird_id").annotate(Count("bird"))
seems to do the job nicely for all combinations of areas, countries
and so on. The key seems to be the usage of the Count() aggregate
function.
Thanks for listening,
Uwe
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