From ac1d365eb9090481fe312a0fcb0cabb601c57a35 Mon Sep 17 00:00:00 2001
From: Ee Durbin <ewdurbin@gmail.com>
Date: Mon, 11 Aug 2025 09:46:39 -0400
Subject: [PATCH 1/2] purge sitetree cache on change

- matches our caching between dev/prod
- adds signal to purge sitetree caches on change

Note: we _should_ migrate to redis for caching, it wasn't around when we first added it
---
 Makefile                   |  3 +++
 pydotorg/apps.py           |  8 ++++++++
 pydotorg/settings/base.py  |  1 +
 pydotorg/settings/local.py |  4 ++--
 pydotorg/signals.py        | 14 ++++++++++++++
 5 files changed, 28 insertions(+), 2 deletions(-)
 create mode 100644 pydotorg/apps.py
 create mode 100644 pydotorg/signals.py

diff --git a/Makefile b/Makefile
index ae0c143dc..c64f2de89 100644
--- a/Makefile
+++ b/Makefile
@@ -17,11 +17,14 @@ default: help
 .state/db-migrated:
 	# Call migrate target
 	make migrate 
+	docker compose run --rm web ./manage.py createcachetable
 
 	# Mark the state so we don't rebuild this needlessly.
 	mkdir -p .state && touch .state/db-migrated
 
 .state/db-initialized: .state/docker-build-web .state/db-migrated
+	# Ensure cache table
+	docker compose run --rm web ./manage.py createcachetable
 	# Load all fixtures
 	docker compose run --rm web ./manage.py loaddata fixtures/*.json
 
diff --git a/pydotorg/apps.py b/pydotorg/apps.py
new file mode 100644
index 000000000..44992e7d9
--- /dev/null
+++ b/pydotorg/apps.py
@@ -0,0 +1,8 @@
+from django.apps import AppConfig
+
+
+class PyDotOrgConfig(AppConfig):
+    name = "pydotorg"
+
+    def ready(self):
+        import pydotorg.signals  # noqa: F401
diff --git a/pydotorg/settings/base.py b/pydotorg/settings/base.py
index 2c392b355..512b9632d 100644
--- a/pydotorg/settings/base.py
+++ b/pydotorg/settings/base.py
@@ -208,6 +208,7 @@
     'django_countries',
     'sorl.thumbnail',
 
+    'pydotorg',
     'banners',
     'blogs',
     'boxes',
diff --git a/pydotorg/settings/local.py b/pydotorg/settings/local.py
index 6525d9837..5735c9865 100644
--- a/pydotorg/settings/local.py
+++ b/pydotorg/settings/local.py
@@ -64,8 +64,8 @@
 
 CACHES = {
     'default': {
-        'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
-        'LOCATION': 'pythondotorg-local-cache',
+        'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
+        'LOCATION': 'django_cache_table',
     }
 }
 
diff --git a/pydotorg/signals.py b/pydotorg/signals.py
new file mode 100644
index 000000000..1d19f34ce
--- /dev/null
+++ b/pydotorg/signals.py
@@ -0,0 +1,14 @@
+from django.db.models.signals import m2m_changed, post_delete, post_save
+from django.dispatch import receiver
+
+from sitetree.models import Tree, TreeItem
+from sitetree.sitetreeapp import get_sitetree
+
+@receiver(post_save, sender=Tree)
+@receiver(post_save, sender=TreeItem)
+@receiver(post_delete, sender=TreeItem)
+@receiver(m2m_changed, sender=TreeItem.access_permissions)
+def purge_sitetree_cache(sender, instance, **kwargs):
+    cache_ = get_sitetree().cache
+    cache_.empty()
+    cache_.reset()

From 51b12a44576b886f066d8a53b2a7d3ea4c5b9b8e Mon Sep 17 00:00:00 2001
From: Ee Durbin <ewdurbin@gmail.com>
Date: Mon, 11 Aug 2025 10:19:28 -0400
Subject: [PATCH 2/2] fix test

---
 sponsors/tests/test_models.py | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/sponsors/tests/test_models.py b/sponsors/tests/test_models.py
index 3566f0b08..e7bb7a64c 100644
--- a/sponsors/tests/test_models.py
+++ b/sponsors/tests/test_models.py
@@ -8,7 +8,7 @@
 from django import forms
 from django.conf import settings
 from django.core.mail import EmailMessage
-from django.test import TestCase
+from django.test import TestCase, override_settings
 from django.utils import timezone
 
 from ..models import (
@@ -327,6 +327,12 @@ def test_singleton_object_cannot_be_deleted(self):
 
         self.assertIn("Singleton object cannot be delete. Try updating it instead.", str(context.exception))
 
+    @override_settings(CACHES={
+        "default": {
+            "BACKEND": "django.core.cache.backends.locmem.LocMemCache",
+            "LOCATION": "pythondotorg-local-cache",
+        }
+    })
     def test_current_year_is_cached(self):
         # cleans cached from previous test runs
         cache.clear()