Refs #28586 - Copied fetch mode in QuerySet.create().

This change allows the pattern `MyModel.objects.fetch_mode(...).create(...)` to
set the fetch mode for a new object.

django/db/models/query.py

@@ -683,6 +683,7 @@ class QuerySet(AltersData):
         obj = self.model(**kwargs)
         self._for_write = True
         obj.save(force_insert=True, using=self.db)
+        obj._state.fetch_mode = self._fetch_mode
         return obj
 
     create.alters_data = True

tests/basic/tests.py

@@ -290,6 +290,13 @@ class ModelTest(TestCase):
         )
         self.assertEqual(Article.objects.get(headline="Article 10"), a10)
 
+    def test_create_method_propagates_fetch_mode(self):
+        article = Article.objects.fetch_mode(models.FETCH_PEERS).create(
+            headline="Article 10",
+            pub_date=datetime(2005, 7, 31, 12, 30, 45),
+        )
+        self.assertEqual(article._state.fetch_mode, models.FETCH_PEERS)
+
     def test_year_lookup_edge_case(self):
         # Edge-case test: A year lookup should retrieve all objects in
         # the given year, including Jan. 1 and Dec. 31.