Catch reuse of cards.

bullestock · Oct 5, 2024 · 4f8508b · 4f8508b
1 parent 0d34796
commit 4f8508b
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/backend/members/models.py b/backend/members/models.py
@@ -12,3 +12,11 @@ class Member(AbstractUser):
 
     def __str__(self):
         return self.get_full_name()
+
+    @receiver(pre_save)
+    def pre_save_handler(sender, instance, *args, **kwargs):
+        if instance.card_id is not None:
+            users = Member.objects.filter(card_id=instance.card_id)
+            for user in users:
+                if user.id != instance.id:
+                    raise Exception(f'User "{user.first_name} {user.last_name}" already has card ID {instance.card_id}')