我想使用UUID字段作为我的id(主键)，但它有问题，我无法修复它
这是我的模型

class Cart(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    created_at = models.DateTimeField(auto_now_add=True)
class CartItem(models.Model):
    cart = models.ForeignKey(Cart, on_delete=models.CASCADE , related_name='items')
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    quantity = models.PositiveSmallIntegerField()
    class Meta:
        unique_together = [['cart'], ['product']]

这是我的Serializer.py

class CartItemSerializer(serializers.ModelSerializer):
    class Meta:
        model = Cart
        fields = ['id', 'product', 'quantity']
class CartSerializer(serializers.ModelSerializer):
    id = serializers.UUIDField(read_only=True)
    items = CartItemSerializer(many=True)
    class Meta:
        model = Cart
        fields = ['id', 'items']

而我的Views.py是

class CartViewSet(CreateModelMixin, RetrieveModelMixin, GenericViewSet):
    queryset = Cart.objects.prefetch_related('items__product').all()
    serializer_class = CartSerializer

我的数据库是Postgres SQL
My Error when I browse my api my guid