How to do SELECT MAX in Django?

Question

I have a list of objects how can I run a query to give the max value of a field:

I\'m using this code:

def get_best_argument(self):
    try:
                 


        

Answer 1

I've tested this for my project, it finds the max/min in O(n) time:

from django.db.models import Max

# Find the maximum value of the rating and then get the record with that rating. 
# Notice the double underscores in rating__max
max_rating = App.objects.aggregate(Max('rating'))['rating__max']
return App.objects.get(rating=max_rating)

This is guaranteed to get you one of the maximum elements efficiently, rather than sorting the whole table and getting the top (around O(n*logn)).