How to implement create and update in one API view.? - django

Question

I have a model called CarDetailsAdd and VehicleDetails (field - description), VehicleDetails is a Foreignkey to CarDetailsAdd. I am using Nested Relationship in this serializer. Using this update function, I can update existing vehicle details. Add and update runs on the same screen, depending on the UI. If the user has updated the field, it should be updated or user has added a new field, it should be added. How do I do that if the user updates and adds at the same time.?
# Serializer
class CarDetailsSerializer(serializers.ModelSerializer):
vehicle_details = VehicleDetailsSerializer(many=True)
class Meta:
model = CarDetailsAdd
fields = (
'id', 'name', 'year', 'color', 'fuel_type',
'vehicle_details',
)
read_only_fields = ['id']
def update(self, instance, validated_data):
vehicle_data = validated_data.pop('vehicle_details')
vehicle = (instance.vehicle_details).all()
vehicle = list(vehicle)
instance.name = validated_data.get('name', instance.name)
instance.year = validated_data.get('year', instance.year)
instance.color = validated_data.get('color', instance.color)
instance.fuel_type = validated_data.get('fuel_type', instance.fuel_type)
instance.save()
for vehicle_data in vehicle_data:
vehicle = vehicle.pop(0)
vehicle.description = vehicle_data.get('description', vehicle.description)
vehicle.save()
return instance
# View
class CarDetailsView(APIView):
permission_classes = [IsAuthenticated]
def put(self, request, pk, format=None):
try:
car = self.get_object(pk)
serializer = CarDetailsSerializer(car, data=request.data)
if serializer.is_valid():
serializer.save()
return Response({'response': 'Update Success', 'result': serializer.data})
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
except:
return Response({'response': 'Oops! Something Went Wrong'}, status=status.HTTP_400_BAD_REQUEST)