Getting a count of objects in a queryset in django

Question

How can I add a field for the count of objects in a database. I have the following models:

class Item(models.Model):
    name = models.CharField()

class Con         


        

Answer 1

Another way of doing this would be using Aggregation. You should be able to achieve a similar result using a single query. Such as this:

Item.objects.values("contest").annotate(Count("id"))

I did not test this specific query, but this should output a count of the items for each value in contests as a dictionary.