Add Notification middleware to automatically mark notifications as read

app/users/middleware.py

@@ -1,7 +1,7 @@
 from zoneinfo import ZoneInfoNotFoundError
 
 from django.utils import timezone
-from users.models import CavingUser
+from users.models import CavingUser, Notification
 
 
 class DistanceUnitsMiddleware:
@@ -42,3 +42,24 @@ def __call__(self, request):
             request.user.save(update_fields=["last_seen"])
 
         return self.get_response(request)
+
+
+class NotificationsMiddleware:
+    """Mark a notification as read if a user goes on the page it links to."""
+
+    def __init__(self, get_response):
+        self.get_response = get_response
+
+    def __call__(self, request):
+        if not request.user.is_authenticated:
+            return self.get_response(request)
+
+        unread_notifications = Notification.objects.filter(
+            user=request.user, read=False
+        )
+        for notification in unread_notifications:
+            if notification.get_url() == request.path:
+                notification.read = True
+                notification.save(update_fields=["read"])
+
+        return self.get_response(request)

config/django/settings/base.py

@@ -153,6 +153,7 @@ def env(name, default=None, force_type: Any = str):
     "users.middleware.TimezoneMiddleware",
     "users.middleware.LastSeenMiddleware",
     "users.middleware.DistanceUnitsMiddleware",
+    "users.middleware.NotificationsMiddleware",
 ]