You cannot call `.save()` after accessing `serializer.data`

Question

Error Showing when post data from API

You cannot call `.save()` after accessing `serializer.data`.If you need to access data before committing to the database then inspect 'serializer.validated_data' instead. 

My written Code is:

serializerdata = serializers.CreateSerializer(data=request.data)
if serializerdata.is_valid():
    user_id = serializerdata.data.get('user_id')
    if user_id==2:
        serializerdata.save(i_created_by=request.user)
        return JsonResponse({"message": "success"}) 
    else:
        return JsonResponse({"message": "user invalid"})    
else:
    return JsonResponse({"message": "error"})   

Answer 1

Take care that in your debugger watch there is no serializer.data listed. It will read out the data before serializer.save() is invoked and lead to this confusing behaviour. Took me at least an hour to figure it out.