signals for clearing cache after delete/save instances.

apps/hadis/apps.py

@@ -4,3 +4,6 @@ from django.apps import AppConfig
 class HadisConfig(AppConfig):
     default_auto_field = 'django.db.models.BigAutoField'
     name = 'apps.hadis'
+    def ready(self):
+        # Import the signals module when the app starts
+        import apps.hadis.signals

apps/hadis/signals.py

@@ -0,0 +1,33 @@
+# hadith_app/signals.py
+
+from django.db.models.signals import post_save, post_delete
+from django.dispatch import receiver
+from django.core.cache import cache
+from .models import * 
+
+# 1. Define all models that affect the list
+# If a Category title changes, the list must update.
+# If a Status changes, the list must update.
+TARGET_MODELS = [Hadis , HadisCategory , HadisCollection , HadisCorrection , HadisInCollection , HadisReference ,
+    HadisSect , HadisStatus , HadisTag , HadisTransmitter , Transmitters ,TransmitterOpinion , TransmitterReliability,
+    TransmitterOriginalText,ReferenceImage , BookReference , BookAttribute, BookAuthor ,BookReferenceImage,
+    NarratorLayer , OpinionStatus ]
+
+@receiver(post_save)
+@receiver(post_delete)
+def clear_hadis_cache(sender, instance, **kwargs):
+    """
+    Clears the API cache whenever a Hadith or related model is saved/deleted.
+    """
+    if sender in TARGET_MODELS:
+        # This is the magic command from django-redis
+        # It finds ALL keys starting with the prefix and deletes them
+        # *:1: is the default django version prefix
+        try:
+            # Delete any key that contains our prefix "hadis_api"
+            # The pattern "*hadis_api*" ensures we catch all variations (headers, pages, etc)
+            cache.delete_pattern("*hadis_api*")
+            print(f"Cache cleared for {sender.__name__} update!")
+        except Exception as e:
+            # Fail silently or log error, don't crash the save transaction
+            print(f"Cache clear failed: {e}")

apps/hadis/urls.py

@@ -9,7 +9,7 @@ from django.views.decorators.vary import vary_on_headers
 
 # Helper function to avoid ugly nesting
 def cached_view(view_func):
-    return cache_page(60*60*2)(vary_on_headers('Accept-Language')(view_func))
+    return cache_page(60*60*2,key_prefix='hadis_api')(vary_on_headers('Accept-Language')(view_func))
 
 
 urlpatterns = [

config/settings/base.py

@@ -959,3 +959,20 @@ UNFOLD_STUDIO_DEFAULT_FRAGMENT = "color-schemes"
 UNFOLD_STUDIO_PERMISSION = lambda request: request.user.is_authenticated
 
 PLAUSIBLE_DOMAIN = env("PLAUSIBLE_DOMAIN")
+
+# uncomment it just to check if redis caches and signals works fine locally
+
+# CACHES = {
+#     'default': {
+#         "BACKEND": "django_redis.cache.RedisCache",
+#         "LOCATION": "redis://127.0.0.1:6379/1",
+#         "OPTIONS": {
+#             "CLIENT_CLASS": "django_redis.client.DefaultClient",
+#         }
+#     },
+#     'memory': {
+#         'BACKEND': 'django.core.cache.backends.locmem.LocMemCache',
+#         'LOCATION': 'unique-snowflake',
+#         'TIMEOUT': 5000,
+#     },
+# }