Django smart field sort

Help me!
5

From what i understand from the lib and django doc it willl be complicated to do this kind os sorting with pagination and everything : python - Ordering Django queryset by a @property - Stack Overflow

This function seems to be the one to change if we want to be able to do it :

    def enhance_queryset(self, queryset, Model, params, request, apply_pagination=True):
        # scopes + filter + search
        queryset = self.filter_queryset(queryset, Model, params, request)

        # sort
        if 'sort' in params:
            queryset = queryset.order_by(params['sort'].replace('.', '__'))

        # segment
        if 'segment' in params:
            collection = Collection._registry[Model._meta.db_table]
            segment = next((x for x in collection.segments if x['name'] == params['segment']), None)
            if segment is not None and 'where' in segment:
                queryset = queryset.filter(segment['where']())

        # limit fields
        queryset = self.handle_limit_fields(params, Model, queryset)

        # pagination
        if apply_pagination:
            queryset = self.get_pagination(params, queryset)

        return queryset

To have something working like i want i will have to do something like this :

class Cart(models.Model):
    id = models.AutoField(primary_key=True)
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    quantity = models.PositiveIntegerField(null=False,blank=False)
    total = models.FloatField(null=False,blank=False)

    def save(self, *args, **kwargs):
        self.total =  self.quantity * self.product.price
        super(Cart, self).save(*args, **kwargs)

The use of smart field has less value in this case