Refs #36152 -- Suppressed duplicate warning when using "%" in alias via values().

django/db/models/query.py

@@ -35,6 +35,7 @@ from django.db.models.utils import (
     resolve_callables,
 )
 from django.utils import timezone
+from django.utils.deprecation import RemovedInDjango70Warning
 from django.utils.functional import cached_property
 
 # The maximum number of results to fetch in a get() query.
@@ -1394,7 +1395,12 @@ class QuerySet(AltersData):
     def _values(self, *fields, **expressions):
         clone = self._chain()
         if expressions:
-            clone = clone.annotate(**expressions)
+            # RemovedInDjango70Warning: When the deprecation ends, deindent as:
+            # clone = clone.annotate(**expressions)
+            with warnings.catch_warnings(
+                action="ignore", category=RemovedInDjango70Warning
+            ):
+                clone = clone.annotate(**expressions)
         clone._fields = fields
         clone.query.set_values(fields)
         return clone

django/db/models/sql/query.py

@@ -1219,7 +1219,7 @@ class Query(BaseExpression):
             if "aggregate" in {frame.function for frame in inspect.stack()}:
                 stacklevel = 5
             else:
-                # annotate() and alias().
+                # annotate(), alias(), and values().
                 stacklevel = 6
             warnings.warn(
                 "Using percent signs in a column alias is deprecated.",

tests/expressions/test_queryset_values.py

@@ -1,5 +1,6 @@
 from django.db.models import F, Sum
 from django.test import TestCase, skipUnlessDBFeature
+from django.utils.deprecation import RemovedInDjango70Warning
 
 from .models import Company, Employee, JSONFieldModel
 
@@ -34,6 +35,12 @@ class ValuesExpressionsTests(TestCase):
             [{"salary": 10}, {"salary": 20}, {"salary": 30}],
         )
 
+    def test_values_expression_containing_percent_sign_deprecation_warns_once(self):
+        msg = "Using percent signs in a column alias is deprecated."
+        with self.assertWarnsMessage(RemovedInDjango70Warning, msg) as cm:
+            Company.objects.values(**{"alias%": F("id")})
+        self.assertEqual(len(cm.warnings), 1)
+
     def test_values_expression_alias_sql_injection(self):
         crafted_alias = """injected_name" from "expressions_company"; --"""
         msg = (