Где ошибка? Поле average_rank не отображается?

Question

[kieko]

Models.py:

class Car(models.Model):
    Make_Name = models.CharField(max_length=100)
    Model_Name = models.CharField(max_length=100)

    def __str__(self):
        return f'{self.Make_Name} {self.Model_Name}'


class Rating(models.Model):
    RATING_CHOICES = (
        (1,'1'),
        (2,'2'),
        (3,'3'),
        (4,'4'),
        (5,'5'),
        )
    rating = models.IntegerField(choices=RATING_CHOICES)
    car = models.ForeignKey(Car,on_delete=models.CASCADE,related_name='rating')

Views.py

class CarViewSet(ListCreateAPIView):
    serializer_class = CarSerializers
    
    def get_queryset(self):
        Car.objects.aggregate(average_rank = Avg('rating__rating'))
        queryset = Car.objects.all()
        return queryset

Serializers.py

class CarSerializers(serializers.ModelSerializer):
    
    average_rank = serializers.DecimalField(decimal_places=3,max_digits=19,read_only=True)

    class Meta:
        model = Car
        fields = ['Make_Name','Model_Name','average_rank']

ответ получаю в виде:

{
        "Make_Name": "Honda",
        "Model_Name": "Civic"
    },

без поля average_rank

Answer 1

[tarp20]

queryset = Car.objects.all()
queryset = queryset.annotate(average_rank = Avg('rating__rating'))