[Answer]-Key error in work with serializer

by

1👍

✅

You should reference the options in the CarSerializer using the options field name rather than the color field name (as you set the related field to be options in the OneToOneField). You do not define a color field directly on the Car.

The following code works for me with the latest django and rest framework:

models.py

class CarModel(models.Model):
    name = models.CharField(max_length=250)

class CarOptionsModel(models.Model):
    car = models.OneToOneField(CarModel, related_name='options')
    color = models.CharField(max_length=250)

serializers.py

class CarOptionsSerializer(serializers.ModelSerializer):
    color = serializers.CharField()

    class Meta:
        model = CarOptionsModel
        fields = ('color',)

class CarSerializer(serializers.ModelSerializer):
    options = CarOptionsSerializer(read_only=True, )

    class Meta:
        model = CarModel
        fields = ('options', 'name')

views.py

class CarViewSet(viewsets.ModelViewSet):
    serializer_class = CarSerializer
    queryset = CarModel.objects.all()

urls.py

router = routers.DefaultRouter()
router.register(r'api', CarViewSet)
urlpatterns = router.urls

I would note that since you define a one to one mapping, you cannot have many=True.

👤Matthew Franglen

Leave a comment