serializer.data werfen AttributeError: 'str' Objekt hat kein Attribut '_meta'

Question

Mein Serializer wirft keinen Fehler, aber jedes Mal, wenn ich versuche, serializer.data zu verwenden, bekomme ich AttributeError: 'str' Objekt hat kein Attribut '_meta ". Ich habe eine Set-Spur gemacht und bestätigt, dass der Typ Contact ist.

File "/test/user_profile/views.py", line 97, in retrieve 
    return Response(serializer.data) 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/rest_framework/serializers.py", line 531, in data 
    ret = super(Serializer, self).data 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/rest_framework/serializers.py", line 262, in data 
    self._data = self.to_representation(self.instance) 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/rest_framework/serializers.py", line 483, in to_representation 
    fields = self._readable_fields 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/django/utils/functional.py", line 35, in __get__ 
    res = instance.__dict__[self.name] = self.func(instance) 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/rest_framework/serializers.py", line 377, in _readable_fields 
    field for field in self.fields.values() 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/rest_framework/serializers.py", line 363, in fields 
    for key, value in self.get_fields().items(): 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/rest_framework/serializers.py", line 983, in get_fields 
    info = model_meta.get_field_info(model) 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/rest_framework/utils/model_meta.py", line 42 


---------- 


, in get_field_info 
    reverse_relations = _get_reverse_relationships(opts) 
    File "/home/will/virtualenvs/generic_api/lib/python3.5/site-packages/rest_framework/utils/model_meta.py", line 146, in _get_reverse_relationships 
    not get_remote_field(relation.field).through._meta.auto_created 
AttributeError: 'str' object has no attribute '_meta' 

Hier ist mein Modell

class Contact(models.Model): 
    SUBSCRIPTION_LEVEL = { 
     0: 'Both', 
     1: 'Monitoring Event', 
     2: 'DVR Down' 
    } 

    id = models.AutoField(primary_key=True, db_column='Id') 
    user = models.ForeignKey(User, db_column='UserId') 
    title = models.CharField(default='', max_length=20, blank=True, db_column='Title') 
    email_one = models.CharField(default='', max_length=75, blank=True, db_column='EmailOne') 
    email_two = models.CharField(default='', max_length=75, blank=True, db_column='EmailTwo') 
    subscription_level = models.IntegerField(default=0, blank=True, db_column='SubscriptionLevel') 
    phone_one = models.CharField(default='', max_length=15, blank=True, db_column='PhoneOne') 
    phone_two = models.CharField(default='', max_length=15, blank=True, db_column='PhoneTwo') 
    company = models.CharField(default='', max_length=50, blank=True, db_column='Company') 
    notes = models.CharField(default='', max_length=500, blank=True, db_column='Notes') 
    vehicle_description = models.CharField(default='', max_length=200, blank=True, db_column='VehicleDescription') 
    vehicle_plates = models.CharField(default='', max_length=20, blank=True, db_column='VehiclePlates') 
    is_active = models.BooleanField(default=True, blank=False, db_column='IsActive') 

Hier ist der Ansicht

class ContactViewSet(ModelViewSet): 
    permission_classes = (permissions.IsAuthenticated,) 
    parser_classes = (parsers.FormParser, parsers.MultiPartParser, parsers.JSONParser,) 
    serializer_class = ContactSerializer 

    def retrieve(self, request, pk=None): 
     queryset = Contact.objects.filter(is_active=True) 

     if not self.request.user.is_staff: 
      queryset = queryset.filter(contacts__user_id=self.request.user.id) 

     contact = get_object_or_404(queryset, id=pk) 
     serializer = ContactSerializer(contact) 
     return Response(serializer.data) 

Und mein Serializer

class ContactSerializer(serializers.ModelSerializer): 
    first_name = serializers.CharField(source='user.first_name', required=False) 
    last_name = serializers.CharField(source='user.last_name', required=False) 

    class Meta: 
     model = Contact 
     fields = ['id', 'user', 'first_name', 'last_name', 'title', 'email_one', 'email_two', 'company', 'notes', 'subscription_level', 
        'phone_one', 'phone_two', 'vehicle_description', 'vehicle_plates', 'is_active'] 

Ich habe mit dem Serializer spielen, auch die Felder zu entfernen oder einfach fi einstellen elds = 'alle' aber ich konnte nicht herausfinden, warum das passiert.

Answer 1

Der Code sieht gut aus. Irgendwie scheint es, dass der Serializer eine umgekehrte Beziehung von vielen zu vielen oder Fremdschlüsseln versäumt. Haben Sie es geschafft, das fehlerhafte Feld zu erkennen?