feat: refunds, failed and pending payments work

home/models/pages.py

@@ -121,7 +121,10 @@ class CoursePage(Page):
             return True
 
         return CoursePurchase.objects.filter(
-            user=user, course=self, refunded=False
+            user=user,
+            course=self,
+            refunded=False,
+            status=CoursePurchase.Status.PAID,
         ).exists()
 
     def _user_purchase_id(self, user):
@@ -129,7 +132,10 @@ class CoursePage(Page):
             return None
 
         purchase = CoursePurchase.objects.filter(
-            user=user, course=self, refunded=False
+            user=user,
+            course=self,
+            refunded=False,
+            status=CoursePurchase.Status.PAID,
         ).first()
         print(f"User {user} purchase for course {self}: {purchase}")
         return purchase.id if purchase else None
@@ -139,15 +145,19 @@ class CoursePage(Page):
         if not user.is_authenticated:
             return False
         obj, created = CoursePurchase.objects.get_or_create(
-            user=user, course=self, refunded=False
+            user=user,
+            course=self,
+            refunded=False,
+            defaults={"status": CoursePurchase.Status.PAID},
         )
+        if obj.status != CoursePurchase.Status.PAID or obj.refunded:
+            obj.status = CoursePurchase.Status.PAID
+            obj.refunded = False
+            obj.save(update_fields=["status", "refunded"])
         # Add user to dedicated access group for this course
         group_name = f"course_{self.id}_access"
         group, _ = Group.objects.get_or_create(name=group_name)
         user.groups.add(group)
-        # Ensure allowed_groups only includes this access group
-        if not self.allowed_groups.filter(id=group.id).exists():
-            self.allowed_groups.add(group)
         return created
 
     def save(self, *args, **kwargs):