From 8b5ffde825c870e1a9e676924085d69be48e512d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Benjamin=20H=C3=A4ttasch?=
<benjamin.haettasch@fachschaft.informatik.tu-darmstadt.de>
Date: Sat, 21 May 2022 11:29:32 +0200
Subject: [PATCH] Update/delete constraint violations when corresponding slot
is deleted
This fixes #131
---
AKScheduling/models.py | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/AKScheduling/models.py b/AKScheduling/models.py
index bfdb1e16..cabf78e1 100644
--- a/AKScheduling/models.py
+++ b/AKScheduling/models.py
@@ -1,4 +1,4 @@
-from django.db.models.signals import post_save, m2m_changed
+from django.db.models.signals import post_save, m2m_changed, pre_delete
from django.dispatch import receiver
from django.utils.translation import gettext_lazy as _
@@ -551,6 +551,19 @@ def akslot_changed_handler(sender, instance: AKSlot, **kwargs):
update_constraint_violations(new_violations, existing_violations_to_check)
+@receiver(pre_delete, sender=AKSlot)
+def akslot_deleted_handler(sender, instance: AKSlot, **kwargs):
+ # Manually clean up or remove constraint violations that belong to this slot since there is no cascade deletion
+ # for many2many relationships. Explicitly listening for AK deletion signals is not necessary since they will
+ # transitively trigger this signal and we always set both AK and AKSlot references in a constraint violation
+ print(f"{instance} deleted")
+
+ for cv in instance.constraintviolation_set.all():
+ # Make sure not delete CVs that e.g., show three parallel slots in a single room
+ if cv.ak_slots.count() <= 2:
+ cv.delete()
+
+
@receiver(post_save, sender=Room)
def room_changed_handler(sender, instance: Room, **kwargs):
# Changes might affect: Room size
--
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