Fixed #22550 -- Prohibited QuerySet.last()/reverse() after slicing.

1 files changed, 2 insertions, 0 deletions

diff --git a/django/db/models/query.py b/django/db/models/query.py
index a20237a229..fdf720cb8a 100644
--- a/django/db/models/query.py
+++ b/django/db/models/query.py
@@ -944,6 +944,8 @@ class QuerySet:
 
     def reverse(self):
         """Reverse the ordering of the QuerySet."""
+        if not self.query.can_filter():
+            raise TypeError('Cannot reverse a query once a slice has been taken.')
         clone = self._clone()
         clone.query.standard_ordering = not clone.query.standard_ordering
         return clone