Django REST Framework perform_create: You cannot call `.save()` after accessing `serializer.data` -

i have following viewset:

class artistprofileviewset(viewsets.modelviewset):     queryset = artistprofile.objects.all()     serializer_class = artistprofileserializer      def perform_create(self, serializer):         if serializer.is_valid():             serializer.save() 

with following serializers:

class simpleartisttrackserializer(serializers.hyperlinkedmodelserializer):     class meta:         model = artisttrack         fields = (...my fields...)   class artistprofileserializer(serializers.hyperlinkedmodelserializer):     owners = userserializer(many=true, required=false)     tracks = simpleartisttrackserializer(many=true, required=false)      class meta:         model = artistprofile         fields = (...my fields...) 

i getting following error:

assertionerror: cannot call `.save()` after accessing `serializer.data`.if need access data before committing database inspect 'serializer.validated_data' instead.  

i don't see editing serializer.data object. there missing cause edit? how can resolve error?

you don't need call is_valid there @ all. when update serializer initialized model instance (based of pk in route, e.g patch /artists/{3}/). call is_valid() if passing data serializer in:

ser = myserializer(data=request.data) # validate incoming post, etc ser.is_valid(raise_exceptions=true) data = ser.validated_data 

to send additional data serializer when saving (e.g. set company, or set user, etc), use override this:

def perform_create(self, serializer):     serializer.save(company=self.request.user.company) 

for more details, browse drf source code , see doing. it's written , clear.

your comment indicates question much bigger. want add additional data "join" table between artists , user. can done, whole different topic , end manually managing relationship. also, read on nested writable serializers, it's big topic , more manual labor.