Django order items by two fields, but ignoring them if they're zero

Question

I have the following model (greatly simplified for the purposes of this question):

class Product(models.Model):
    price = models.DecimalField(max_digits=8, dec         


        

Answer 1

If you stumble upon this requirement and happen to be using Django 1.8 and higher, you can use django.db.models.functions.Coalesce for a slightly nicer, cross db-engine, solution:

from django.db.models.functions import Coalesce

Product.objects.annotate(
    current_price=Coalesce('sale_price', 'price')
).order_by('-current_price')