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14081 fixed cached counters on delete for parent-child items

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This commit is contained in:
Arthur 2023-10-27 11:33:09 -07:00
parent 5b2f29480a
commit acfde343c2
1 changed files with 14 additions and 5 deletions
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19
netbox/utilities/counters.py
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@ -1,6 +1,6 @@
from django.apps import apps from django.apps import apps
from django.db.models import F, Count, OuterRef, Subquery from django.db.models import F, Count, OuterRef, Subquery
from django.db.models.signals import post_delete, post_save from django.db.models.signals import post_delete, post_save, pre_delete
from netbox.registry import registry from netbox.registry import registry
from .fields import CounterCacheField from .fields import CounterCacheField
@ -62,6 +62,11 @@ def post_save_receiver(sender, instance, created, **kwargs):
update_counter(parent_model, new_pk, counter_name, 1) update_counter(parent_model, new_pk, counter_name, 1)
def pre_delete_receiver(sender, instance, origin, **kwargs):
if not type(instance).objects.filter(pk=instance.pk).exists():
instance._previously_removed = True
def post_delete_receiver(sender, instance, origin, **kwargs): def post_delete_receiver(sender, instance, origin, **kwargs):
""" """
Update counter fields on related objects when a TrackingModelMixin subclass is deleted. Update counter fields on related objects when a TrackingModelMixin subclass is deleted.
@ -71,10 +76,8 @@ def post_delete_receiver(sender, instance, origin, **kwargs):
parent_pk = getattr(instance, field_name, None) parent_pk = getattr(instance, field_name, None)
# Decrement the parent's counter by one # Decrement the parent's counter by one
if parent_pk is not None: if parent_pk is not None and not hasattr(instance, "_previously_removed"):
# MPTT sends two delete signals for child elements so guard against multiple decrements update_counter(parent_model, parent_pk, counter_name, -1)
if not origin or origin == instance:
update_counter(parent_model, parent_pk, counter_name, -1)
# #
@ -112,3 +115,9 @@ def connect_counters(*models):
weak=False, weak=False,
dispatch_uid=f'{model._meta.label}.{field.name}' dispatch_uid=f'{model._meta.label}.{field.name}'
) )
pre_delete.connect(
pre_delete_receiver,
sender=to_model,
weak=False,
dispatch_uid=f'{model._meta.label}.{field.name}'
)