dynamische Update-Instanz auf Django REST-Framework

Question

Hallo Ich versuche, diese dynamisch mit benutzerdefinierter Methode Update Django REST-Framework wie zu aktualisieren:

serializers.py

class ArtistSerializer(serializers.Serializer): 
    id = serializers.IntegerField(required=False) 
    name = serializers.CharField(max_length=100, required=True) 

    def create(self, validated_data): 
     Personnels.objects.create(**self.validated_data) 

    def update(self, instance, validated_data): 
     # for k,v in self.validated_data.iteritems(): 
      # instance['k'] = self.validated_data.get(k, instance[k]) 
     # instance.name = self.validated_data.get('name', instance.name) 
     instance['name'] = self.validated_data.get('name', instance.name) 
     instance.save() 
     return instance 

views.py

@api_view(['PUT']) 
def artist_serialization_specific(request, artist_id): 
    if request.method == "PUT": # Example of updating an object via manual serialization 
     # return HttpResponse(artist_id) 
     personnel = Personnels.objects.get(id=artist_id) 
     x = ArtistSerializer(personnel, data={"name":"John Doe"}) 
     if x.is_valid(): 
      x.update(personnel, x.validated_data) 
     else: 
      print x.errors 
     return Response(x.data, status=status.HTTP_200_OK) 

Allerdings bekomme ich diesen Fehler:

Internal Server Error: /forms/artists/serialization/3/ 
Traceback (most recent call last): 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/django/core/handlers/exception.py", line 39, in inner 
    response = get_response(request) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/django/core/handlers/base.py", line 249, in _legacy_get_response 
    response = self._get_response(request) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/django/core/handlers/base.py", line 187, in _get_response 
    response = self.process_exception_by_middleware(e, request) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/django/core/handlers/base.py", line 185, in _get_response 
    response = wrapped_callback(request, *callback_args, **callback_kwargs) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view 
    return view_func(*args, **kwargs) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view 
    return self.dispatch(request, *args, **kwargs) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/rest_framework/views.py", line 474, in dispatch 
    response = self.handle_exception(exc) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/rest_framework/views.py", line 434, in handle_exception 
    self.raise_uncaught_exception(exc) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/rest_framework/views.py", line 471, in dispatch 
    response = handler(request, *args, **kwargs) 
    File "/Users/deanarmada/.virtualenvs/django-cassandra/lib/python2.7/site-packages/rest_framework/decorators.py", line 52, in handler 
    return func(*args, **kwargs) 
    File "/Users/deanarmada/Desktop/projects/python-projects/django/django-cassandra/tutorial/example/views.py", line 85, in artist_serialization_specific 
    x.update(personnel, x.validated_data) 
    File "/Users/deanarmada/Desktop/projects/python-projects/django/django-cassandra/tutorial/example/serializers.py", line 21, in update 
    instance['name'] = self.validated_data.get('name', instance.name) 
TypeError: 'Personnels' object does not support item assignment 

Answer 1

Verwenden setattr(instance, "name", value) statt:

setattr(instance, "name", self.validated_data.get('name', instance.name)) 

Es ist nicht möglich, django Objektattribute von "Element-Zuweisungen" in der Tat zu ändern.