From b1e27b2023fed8535ed2e3c6b9bbd17fed821636 Mon Sep 17 00:00:00 2001
From: Michael Bauer <michael-bauer@posteo.de>
Date: Fri, 25 Oct 2024 20:38:19 +0200
Subject: [PATCH] Reduce queries for teachers_and_subjects_table with prefetch
---
aleksis/apps/alsijil/tasks.py | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/aleksis/apps/alsijil/tasks.py b/aleksis/apps/alsijil/tasks.py
index e8dead026..c7a9ae2b8 100644
--- a/aleksis/apps/alsijil/tasks.py
+++ b/aleksis/apps/alsijil/tasks.py
@@ -3,7 +3,7 @@ from typing import Optional
from copy import deepcopy
from datetime import date, timedelta
-from django.db.models import Q
+from django.db.models import Q, Prefetch
from django.utils.translation import gettext as _
from calendarweek import CalendarWeek
@@ -175,12 +175,10 @@ def generate_full_register_printout(
if include_teachers_and_subjects_table:
group = group.prefetch_related(
- "courses",
- "courses__subject",
+ Prefetch("courses", queryset=Course.objects.select_related("subject")),
"courses__teachers",
"child_groups",
- "child_groups__courses",
- "child_groups__courses__subject",
+ Prefetch("child_groups__courses", queryset=Course.objects.select_related("subject")),
"child_groups__courses__teachers",
)
--
GitLab