Django: Distinct foreign keys

Question

class Log:
 project = ForeignKey(Project)
 msg = CharField(...)
 date = DateField(...)

I want to select the four most recent Log entries where each

Answer 1

Queries don't work like that - either in Django's ORM or in the underlying SQL. If you want to get unique IDs, you can only query for the ID. So you'll need to do two queries to get the actual Log entries. Something like:

id_list = Log.objects.order_by('-date').values_list('project_id').distinct()[:4]
entries = Log.objects.filter(id__in=id_list)