Fixed #28974 -- Made refresh_from_db() hint routers about its instance.

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/multiple_database/tests.py b/tests/multiple_database/tests.py
index 50859a3dc6..ab88ecf875 100644
--- a/tests/multiple_database/tests.py
+++ b/tests/multiple_database/tests.py
@@ -2,6 +2,7 @@ import datetime
 import pickle
 from io import StringIO
 from operator import attrgetter
+from unittest.mock import Mock
 
 from django.contrib.auth.models import User
 from django.contrib.contenttypes.models import ContentType
@@ -103,6 +104,14 @@ class QueryTestCase(TestCase):
         self.assertEqual(dive.title, "Dive into Python (on default)")
         self.assertEqual(dive._state.db, "default")
 
+    def test_refresh_router_instance_hint(self):
+        router = Mock()
+        router.db_for_read.return_value = None
+        book = Book.objects.create(title='Dive Into Python', published=datetime.date(1957, 10, 12))
+        with self.settings(DATABASE_ROUTERS=[router]):
+            book.refresh_from_db()
+        router.db_for_read.assert_called_once_with(Book, instance=book)
+
     def test_basic_queries(self):
         "Queries are constrained to a single database"
         dive = Book.objects.using('other').create(title="Dive into Python", published=datetime.date(2009, 5, 4))