# serializers.py
class BookSerializer(serializers.ModelSerializer):
    author = AuthorSerializer()

    class Meta:
        model = Book
        fields = ('title', 'author', 'genre')

# views.py
@api_view(['GET', 'POST'])
@csrf_exempt
def book_list(request):
    serializer = BookSerializer(data=request.DATA)
    if serializer.is_valid():
        serializer.save()
        return Response(serializer.data, status=status.HTTP_201_CREATED)
    else:
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)