Question

I want to order my QuerySet in ascending order for this case:

PRIORITY_CHOICES = (
(1, "P1"),
(2, "P2"),
(3, "P3"),
(4, "P4"),
(5, "P5"),
)

class Task(models.Model):
     name = models.CharField(max_length=255)
     priority = models.PositiveIntegerField(choices=PRIORITY_CHOICES)

Now, since, the priority can accept None values. The problem is with ordering the Query set when I do this in my View code:

task_list = Task.objects.all().order_by("priority")

This returns me the query set with the objects arranged in ascending order of priority, with the None values first. I want the ascending list but I want to include the None values at the end. I have a huge database so, I am interested in accomplishing this at the database level.

Answer 1

This is probably your best option.

import itertools
q = itertools.chain(
        Task.objects.filter(priority__isnull=False).order_by("priority"),
        Task.objects.filter(priority__isnull=True))
# Then you can iterate over your custom order
result = [(x.name, x.priority) for x in q]