I am trying to plot some numbers on my charts. But I have a problem summing the number of professionals per district(foreign key). Here is my model.py.

class District(models.Model):
    name = models.CharField(max_length=50, blank=True, null=True)
    location = models.CharField(max_length=80, blank=True, null=True)
    population = models.IntegerField(blank=True, null=True)

class Household(models.Model):
    district = models.ForeignKey(District, on_delete=models.CASCADE, null=True)
    family_name = models.CharField(max_length=50, blank=True, null=True)
    address = models.CharField(max_length=150, blank=True, null=True)
    members = models.IntegerField(blank=True, null=True)  # no of members
    professionals = models.IntegerField(blank=True, null=True)  # no of professionals
    ...

Below is just an overall total of professionals. But how can I sum it by district?

from django.db.models import Sum
def dashboard(request):
    stats = Household.objects.annotate(total_prof=Sum('professionals'))