How to perform a join and aggregate count in Django

Question

I have two models:

class Unit (models.Model):
    Unit_name = models.CharField(max_length=30)
    Hull_number = models.CharField(max_length=30)
    Parent_unit =         


        

Answer 1

Hope this helps:

from django.db.models import Count
MemberUnit.objects.values('Unit__Unit_name').annotate(c=Count('Unit'))

You can try this in Django's shell:

manage.py shell

See docs