From a627c1ef7827bc81422f772e2e1cb49e928dbf6f Mon Sep 17 00:00:00 2001
From: Tiago Scholten <tiagoscholten9@gmail.com>
Date: Mon, 8 Jun 2026 09:20:10 +0200
Subject: [PATCH] updated GroupRef to new system

---
 src/fiber_package/groups/communication.py | 2 +-
 src/fiber_package/groups/signuplist.py    | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/fiber_package/groups/communication.py b/src/fiber_package/groups/communication.py
index 13c3d24..52f6c74 100644
--- a/src/fiber_package/groups/communication.py
+++ b/src/fiber_package/groups/communication.py
@@ -60,7 +60,7 @@ class ActivityModel(CommunicationModel):
         Field(pattern=CommunicationCategory.activity)
     ]
 
-    signuplist: GroupRef = GroupRef("signuplist", None)
+    signuplist: GroupRef | None = None
     # TODO: validate that a signuplist can only be attached if category is
     # activity? Or should this not be validated?
 
diff --git a/src/fiber_package/groups/signuplist.py b/src/fiber_package/groups/signuplist.py
index 042c2a4..92982fa 100644
--- a/src/fiber_package/groups/signuplist.py
+++ b/src/fiber_package/groups/signuplist.py
@@ -7,6 +7,7 @@ from fiber_package.util import GroupRef
 A sign-up list is a list of members that have signed up for a given activity.
 '''
 class SignuplistModel(BaseModel):
-    activity: GroupRef = GroupRef("communication", None)
+    activity: GroupRef | None = None
     # TODO: validate that the communication is indeed an activity (or should
     # this be done?)
+    # Should None be allowed?