wip: testing adding resources to shopping cart

1 files changed, 3 insertions, 0 deletions

diff --git a/pyblackbird_cc/payments/models.py b/pyblackbird_cc/payments/models.py
index 81bb1c8..b947a22 100644
--- a/pyblackbird_cc/payments/models.py
+++ b/pyblackbird_cc/payments/models.py
@@ -1,4 +1,5 @@
 from django.conf import settings
+from django.core.exceptions import ValidationError
 from django.db import models
 
 from pyblackbird_cc.resources.models import Resource
@@ -27,6 +28,8 @@ class ShoppingCart(models.Model):
         return f"Shopping Cart for {self.user.username}"
 
     def add_resource(self, resource: Resource):
+        if CartItem.objects.filter(cart=self, resource=resource).exists():
+            raise ValidationError(f"{resource.name} is already in your shopping cart.")
         item, created = CartItem.objects.get_or_create(
             cart=self,
             resource=resource,