From 6b7bd079a6fc4e84553262b65074dbe0af456b03 Mon Sep 17 00:00:00 2001
From: Simon Charette <simon.charette@zapier.com>
Date: Mon, 23 Sep 2019 15:51:43 -0400
Subject: [3.0.x] Fixed #30796 -- Prevented select_related() from mutating a
 queryset on chaining.

Thanks Darren Maki for the report.

Backport of 37f8f293775d0b672da8ae369d9a4e17f1db7851 from master
---
 tests/queries/test_query.py | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'tests')

diff --git a/tests/queries/test_query.py b/tests/queries/test_query.py
index c6a659fe97..f0d3a6260a 100644
--- a/tests/queries/test_query.py
+++ b/tests/queries/test_query.py
@@ -106,3 +106,10 @@ class TestQuery(SimpleTestCase):
         self.assertIsInstance(b_isnull, RelatedIsNull)
         self.assertIsInstance(b_isnull.lhs, SimpleCol)
         self.assertEqual(b_isnull.lhs.target, ObjectC._meta.get_field('objectb'))
+
+    def test_clone_select_related(self):
+        query = Query(Item)
+        query.add_select_related(['creator'])
+        clone = query.clone()
+        clone.add_select_related(['note', 'creator__extra'])
+        self.assertEqual(query.select_related, {'creator': {}})
-- 
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