Django annotate count with a distinct field

Question

I have two models defined loosely like this:

class InformationUnit(models.Model):
    username = models.CharField(max_length=255)
    project = models.Foreig         


        

Answer 1

If you just want to count the distinct values, you can use the distinct() and count() functions:

count = Project.objects.values('informationunit__username').distinct().count()