How to assign ranking on objects based on a value in a queryset - python-3.x

Question

I have a queryset that returns a list of menus that and I want to assign each Menu a rank based on the number of votes accumulated is there a way I can achieve this using django Query Expressions? I'm also open to any other suggestions.
The queryset is as follows:
qs = Menu.objects.filter(Q(created_at__date__iexact=todays_date)).order_by('-votes')
And the Menu class model is shown below:
class Menu(models.Model):
"""Represents menu class model"""
restaurant = models.ForeignKey(Restaurant,null=True,blank=True,on_delete=models.CASCADE)
file = models.FileField(upload_to='menus/')
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
uploaded_by = models.CharField(max_length=50, null=True, blank=True)
votes = models.IntegerField(default=0)
After serializing the queryset returns the following data:
[
{
"id": 10,
"file": "https://res.cloudinary.com/dw9bllelz/raw/upload/v1/media/menus/index_ah660c.jpeg",
"restaurant": "Burger King",
"votes": 10,
"created_at": "2021-06-03T09:33:05.505482+03:00"
},
{
"id": 9,
"file": "https://res.cloudinary.com/dw9bllelz/raw/upload/v1/media/menus/index_ah660c.jpeg",
"restaurant": "Texas Plates",
"votes": 2,
"created_at": "2021-06-03T09:33:05.505482+03:00"
},
{
"id": 8,
"file": "https://res.cloudinary.com/dw9bllelz/raw/upload/v1/media/menus/index_ah660c.jpeg",
"restaurant": "Carlito Dishes",
"votes": 2,
"created_at": "2021-06-03T09:33:05.505482+03:00"
},
{
"id": 7,
"file": "https://res.cloudinary.com/dw9bllelz/raw/upload/v1/media/menus/index_ah660c.jpeg",
"restaurant": "Kram Dishes",
"votes": 1,
"created_at": "2021-06-03T09:33:05.505482+03:00"
},
]

Answer 1

You can either use the index of the object in the array as its index or you can use Window functions [Django docs] and use the Rank or DenseRank (Reference [Django docs]) function to compute the ranks as per your need:
from django.db.models import F, Window
from django.db.models.functions import Rank
qs = Menu.objects.filter(
Q(created_at__date__iexact=todays_date)
).annotate(
rank=Window(
expression=Rank(),
order_by=F('votes').desc(),
)
)
for menu in qs:
print(menu.rank, menu.votes)