Ordering a Django queryset by the returned results of a method

Question

Let\'s say I have a queryset of things Bill has worked on like this:

test=Things.objects.filter(user=\'Bill\')

Now I want to sort all those

Answer 1

see these answers to use a computed value to sort a QuerySet:

• how to sort by a computed value in django
• Order a QuerySet by aggregate field value

Basically if thing_date() can be determined using a query expression, then you can use it to annotate and search the query set.

from django.db.models import F
from django.utils import timezone
test = Things.objects.filter(user='Bill').annotate(
    thing_date=(F('') - timezone.now())  # some computation
).order_by('thing_date')