fix

alkatorapi/views.py

@@ -350,8 +350,10 @@ def cart_add(request):
     _id = request.GET['id']
     user = request.user
     if not user.cart:
-        user.cart = Cart(user=user)
-        user.cart.save()
+        cart = Cart(user=user)
+        cart.save()
+    else:
+        cart = user.cart
     cart_product = CartProduct(
         product=Product.objects.get(id=_id),
         cart=user.cart,