Fixed #18556 -- Allowed RelatedManager.add() to execute 1 query where possible.

Thanks Loic Bistuer for review.

1 files changed, 9 insertions, 0 deletions

diff --git a/tests/many_to_one_null/tests.py b/tests/many_to_one_null/tests.py
index e39f527abe..06f756e35b 100644
--- a/tests/many_to_one_null/tests.py
+++ b/tests/many_to_one_null/tests.py
@@ -115,6 +115,15 @@ class ManyToOneNullTests(TestCase):
         self.assertEqual(1, self.r2.article_set.count())
         self.assertEqual(1, qs.count())
 
+    def test_add_efficiency(self):
+        r = Reporter.objects.create()
+        articles = []
+        for _ in range(3):
+            articles.append(Article.objects.create())
+        with self.assertNumQueries(1):
+            r.article_set.add(*articles)
+        self.assertEqual(r.article_set.count(), 3)
+
     def test_clear_efficiency(self):
         r = Reporter.objects.create()
         for _ in range(3):