From 6757c94662ef07e35eafcf3ac8bdae07a3d9326a Mon Sep 17 00:00:00 2001
From: Claude Paroz <claude@2xlibre.net>
Date: Tue, 2 Aug 2016 17:27:45 +0200
Subject: [1.10.x] Fixed #26983 -- Fixed isnull filtering on ForeignKey with
 to_field

Thanks weidwonder for the report.
Backport of 272eccf7ff0ced609e5a5e3bb6b4a40e773e0e66 from master.
---
 tests/queries/tests.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'tests')

diff --git a/tests/queries/tests.py b/tests/queries/tests.py
index 48b57376f9..a3a810ce5e 100644
--- a/tests/queries/tests.py
+++ b/tests/queries/tests.py
@@ -2483,6 +2483,19 @@ class ToFieldTests(TestCase):
             [node1]
         )
 
+    def test_isnull_query(self):
+        apple = Food.objects.create(name="apple")
+        Eaten.objects.create(food=apple, meal="lunch")
+        Eaten.objects.create(meal="lunch")
+        self.assertQuerysetEqual(
+            Eaten.objects.filter(food__isnull=False),
+            ['<Eaten: apple at lunch>']
+        )
+        self.assertQuerysetEqual(
+            Eaten.objects.filter(food__isnull=True),
+            ['<Eaten: None at lunch>']
+        )
+
 
 class ConditionalTests(BaseQuerysetTest):
     """Tests whose execution depend on different environment conditions like
-- 
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