django-aggregation

I'm trying to get the count of the number of times a player played each week like this: player.game_objects.extra( select={'week': 'WEEK(`games_game`.`date`)'} ).aggregate(count=Count('week')) But Django complains that FieldError: Cannot resolve keyword 'week' into field. Choices are: <lists model fields> I can do it in raw SQL like this SELECT WEEK(date) as week, COUNT(WEEK(date)) as count FROM games_game WHERE player_id = 3 GROUP BY week Is there a good way to do this without executing raw SQL in Django? You could use a custom aggregate function to produce your query: WEEK_FUNC = 'STRFTIME("

This is a bleeding-edge feature that I'm currently skewered upon and quickly bleeding out. I want to annotate a subquery-aggregate onto an existing queryset. Doing this before 1.11 either meant custom SQL or hammering the database. Here's the documentation for this , and the example from it: from django.db.models import OuterRef, Subquery, Sum comments = Comment.objects.filter(post=OuterRef('pk')).values('post') total_comments = comments.annotate(total=Sum('length')).values('total') Post.objects.filter(length__gt=Subquery(total_comments)) They're annotating on the aggregate, which seems weird

I have a fairly simple query I'd like to make via the ORM, but can't figure that out.. I have three models: Location (a place), Attribute (an attribute a place might have), and Rating (a M2M 'through' model that also contains a score field) I want to pick some important attributes and be able to rank my locations by those attributes - i.e. higher total score over all selected attributes = better. I can use the following SQL to get what I want: select location_id, sum(score) from locations_rating where attribute_id in (1,2,3) group by location_id order by sum desc; which returns location_id |