From 3f747a442730774ebedd88e9255db1a84539a4b7 Mon Sep 17 00:00:00 2001
From: Pelle Koster <pelle.koster@geant.org>
Date: Wed, 11 Dec 2024 14:00:01 +0100
Subject: [PATCH] Prevent another database query during htmx requests

---
 src/argus/auth/context_processors.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/argus/auth/context_processors.py b/src/argus/auth/context_processors.py
index 49e792650..226d5a12e 100644
--- a/src/argus/auth/context_processors.py
+++ b/src/argus/auth/context_processors.py
@@ -7,9 +7,14 @@
 See django settings for ``TEMPLATES``.
 """
 
+import functools
 from argus.auth.models import Preferences
 
 
+# When ``render`` is called multiple times during a request (such as by HtmxMessageMiddleware),
+# that also results in this function being called more than once for a request. That's unnecessary.
+# Luckily we can cache the result for a request.
+@functools.lru_cache(maxsize=10)
 def preferences(request):
     preferences_choices = {}
     for namespace, cls in Preferences.NAMESPACES.items():