Delete EventAreaStatistics for test event areas

parkings/signals.py

@@ -2,11 +2,11 @@
 from math import ceil
 
 from django.db import transaction
-from django.db.models.signals import post_delete, post_save
+from django.db.models.signals import post_delete, post_save, pre_delete
 from django.dispatch import receiver
 from django.utils import timezone
 
-from parkings.models import EventParking
+from parkings.models import EventArea, EventAreaStatistics, EventParking
 
 
 @transaction.atomic
@@ -42,3 +42,11 @@ def event_parking_on_save(sender, **kwargs):
 def event_parking_on_delete(sender, **kwargs):
     obj = kwargs["instance"]
     update_statistics(obj.event_area)
+
+
+@receiver(pre_delete, sender=EventArea)
+def event_area_on_delete(sender, **kwargs):
+    obj = kwargs["instance"]
+    # Only test event areas can be deleted.
+    if obj.is_test:
+        EventAreaStatistics.objects.filter(event_area=obj).delete()