DRF - CreateAPIView Nested Serializer

Question

I've an interesting question and want expert views on it.

I've the following models.

class A(models.Model):
    b = ForeignKey(B)
    c = ForeignKey(B)
    d = ForeignKey(B)

class B(models.Model):
    pass

class C(models.Model):
    pass

class D(models.Model):
    pass

Following are my serializers:

class ASearializer(serializers.Serializer):
    b = BSearializer()
    c = CSearializer()
    d = DSearializer()

    class Meta:
        model = A
        fields = ('b', 'c', 'd')

    def create(self, data):
        # I create the instance of A, B, C and D.
        return instance_of_A

class BSearializer(serializers.Serializer):
    class Meta:
        model = B
        fields = '__all__'

class CSearializer(serializers.Serializer):
    class Meta:
        model = C
        fields = '__all__'

class DSearializer(serializers.Serializer):
    class Meta:
        model = D
        fields = '__all__'

My views:-

class View(CreateAPIView):
    serializer_class = Aserializer
    queryset = A.object.all().select_related('b').select_related('c').select_related('d')

Everything works as expected. The request and the response works correctly.

However, the queries fired are not the way it was expected. While returning the data, DRF fires 3 extra queries to filter B, C and D, thereby ignoring the queryset.

1) How to make DRF fire one single JOIN query?