Fixed #28586 -- Added model field fetch modes.

May your database queries be much reduced with minimal effort.

co-authored-by: Andreas Pelme <andreas@pelme.se>
co-authored-by: Simon Charette <charette.s@gmail.com>
co-authored-by: Jacob Walls <jacobtylerwalls@gmail.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/tests/prefetch_related/tests.py b/tests/prefetch_related/tests.py
index 54b197ad83..6e4acdddf6 100644
--- a/tests/prefetch_related/tests.py
+++ b/tests/prefetch_related/tests.py
@@ -4,6 +4,7 @@ from django.contrib.contenttypes.models import ContentType
 from django.core.exceptions import ObjectDoesNotExist
 from django.db import NotSupportedError, connection
 from django.db.models import F, Prefetch, QuerySet, prefetch_related_objects
+from django.db.models.fetch_modes import RAISE
 from django.db.models.query import get_prefetcher
 from django.db.models.sql import Query
 from django.test import (
@@ -107,6 +108,10 @@ class PrefetchRelatedTests(TestDataMixin, TestCase):
         normal_books = [a.first_book for a in Author.objects.all()]
         self.assertEqual(books, normal_books)
 
+    def test_fetch_mode_raise(self):
+        authors = list(Author.objects.fetch_mode(RAISE).prefetch_related("first_book"))
+        authors[0].first_book  # No exception, already loaded
+
     def test_foreignkey_reverse(self):
         with self.assertNumQueries(2):
             [