Django annotation with nested filter

Question

Is it possible to filter within an annotation?

In my mind something like this (which doesn\'t actually work)

Student.objects.all().annotate(Count(\'at

Answer 1

Maybe this will work for you:

excused = Student.objects.filter(attendance__type='Excused').annotate(abs=Count('attendance'))

You need to filter the Students you're looking for first to just those with excused absences and then annotate the count of them.

Here's a link to the Django Aggregation Docs where it discusses filtering order.