From f8b8b00f0197e52f7a0986fae51462be174dbaea Mon Sep 17 00:00:00 2001
From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Thu, 23 May 2019 20:33:37 +0200
Subject: Fixed #30501 -- Preventing QuerySet.reverse() from mutating
 expressions in QuerySet.order_by and Meta.ordering.

---
 django/db/models/sql/compiler.py | 1 +
 1 file changed, 1 insertion(+)

(limited to 'django/db/models/sql')

diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py
index aea3ec8d5e..7fdf551554 100644
--- a/django/db/models/sql/compiler.py
+++ b/django/db/models/sql/compiler.py
@@ -281,6 +281,7 @@ class SQLCompiler:
                 if not isinstance(field, OrderBy):
                     field = field.asc()
                 if not self.query.standard_ordering:
+                    field = field.copy()
                     field.reverse_ordering()
                 order_by.append((field, False))
                 continue
-- 
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