From 54e2e688e1cfbdb37dfa5dd3b3ffdf2af12b4423 Mon Sep 17 00:00:00 2001
From: Tim Graham <timograham@gmail.com>
Date: Fri, 20 Nov 2015 10:31:33 -0500
Subject: Fixed #25715 -- Fixed Model.refresh_from_db() with ForeignKey
 w/on_delete=SET_NULL.

---
 tests/basic/models.py |  1 +
 tests/basic/tests.py  | 11 +++++++++++
 2 files changed, 12 insertions(+)

(limited to 'tests/basic')

diff --git a/tests/basic/models.py b/tests/basic/models.py
index 0e85087d32..91fbe7d648 100644
--- a/tests/basic/models.py
+++ b/tests/basic/models.py
@@ -34,6 +34,7 @@ class SelfRef(models.Model):
         null=True, blank=True,
         related_name='+',
     )
+    article = models.ForeignKey(Article, models.SET_NULL, null=True, blank=True)
 
     def __str__(self):
         # This method intentionally doesn't work for all cases - part
diff --git a/tests/basic/tests.py b/tests/basic/tests.py
index 84033da43e..c67f78926f 100644
--- a/tests/basic/tests.py
+++ b/tests/basic/tests.py
@@ -765,6 +765,17 @@ class ModelRefreshTests(TestCase):
         self.assertEqual(a2.pub_date, pub_date)
         self.assertEqual(a2._state.db, "default")
 
+    def test_refresh_fk_on_delete_set_null(self):
+        a = Article.objects.create(
+            headline='Parrot programs in Python',
+            pub_date=datetime(2005, 7, 28),
+        )
+        s1 = SelfRef.objects.create(article=a)
+        a.delete()
+        s1.refresh_from_db()
+        self.assertIsNone(s1.article_id)
+        self.assertIsNone(s1.article)
+
     def test_refresh_no_fields(self):
         a = Article.objects.create(pub_date=self._truncate_ms(datetime.now()))
         with self.assertNumQueries(0):
-- 
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