fix

alkatorapi/views.py

@@ -351,14 +351,14 @@ def cart_add(request):
     _id = request.GET['id']
     user = request.user
     try:
-        user.cart
+        cart = user.cart
     except User.cart.RelatedObjectDoesNotExist:
         cart = Cart(user=user)
         cart.save()
     try:
         cart_product = CartProduct(
             product=Product.objects.get(id=_id),
-            cart=user.cart,
+            cart=cart,
             quantity=1,
         )
         cart_product.save()