From 158eca4f93e492a6cc6f0240a0b6da3b7aa98ee6 Mon Sep 17 00:00:00 2001
From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Mon, 26 Apr 2021 12:07:16 +0200
Subject: [PATCH] Refs #19080 -- Added tests for preserving select_related() in
 the admin changelist.

---
 tests/admin_changelist/admin.py |  1 +
 tests/admin_changelist/tests.py | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/tests/admin_changelist/admin.py b/tests/admin_changelist/admin.py
index 4f23296eca..0397e8557a 100644
--- a/tests/admin_changelist/admin.py
+++ b/tests/admin_changelist/admin.py
@@ -33,6 +33,7 @@ site.register(Event, EventAdmin)
 class ParentAdmin(admin.ModelAdmin):
     list_filter = ['child__name']
     search_fields = ['child__name']
+    list_select_related = ['child']
 
 
 class ChildAdmin(admin.ModelAdmin):
diff --git a/tests/admin_changelist/tests.py b/tests/admin_changelist/tests.py
index 8da1c2f799..dc1b987a1e 100644
--- a/tests/admin_changelist/tests.py
+++ b/tests/admin_changelist/tests.py
@@ -104,6 +104,20 @@ class ChangeListTests(TestCase):
         cl = m.get_changelist_instance(request)
         self.assertEqual(cl.queryset.query.select_related, {'parent': {}})
 
+    def test_select_related_preserved_when_multi_valued_in_search_fields(self):
+        parent = Parent.objects.create(name='Mary')
+        Child.objects.create(parent=parent, name='Danielle')
+        Child.objects.create(parent=parent, name='Daniel')
+
+        m = ParentAdmin(Parent, custom_site)
+        request = self.factory.get('/parent/', data={SEARCH_VAR: 'daniel'})
+        request.user = self.superuser
+
+        cl = m.get_changelist_instance(request)
+        self.assertEqual(cl.queryset.count(), 1)
+        # select_related is preserved.
+        self.assertEqual(cl.queryset.query.select_related, {'child': {}})
+
     def test_select_related_as_tuple(self):
         ia = InvitationAdmin(Invitation, custom_site)
         request = self.factory.get('/invitation/')