From 67b2b1f116aceee12922d2a8ff832382bca7e8ad Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ingo=20Kl=C3=B6cker?= <djangoproject@ingo-kloecker.de>
Date: Fri, 7 Apr 2017 12:47:23 +0200
Subject: [PATCH] Refs #26605 -- Added migrations state test for a swappable
 model inheriting an abstract model inheriting concrete model.
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Thanks Sébastien Diemer for the report and test.
---
 tests/migrations/test_state.py | 42 ++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/tests/migrations/test_state.py b/tests/migrations/test_state.py
index cb8156fc00..8b3d1f998a 100644
--- a/tests/migrations/test_state.py
+++ b/tests/migrations/test_state.py
@@ -1006,6 +1006,48 @@ class ModelStateTests(SimpleTestCase):
         self.assertEqual(author_state.bases, (models.Model, ))
         self.assertEqual(author_state.managers, [])
 
+    @override_settings(TEST_SWAPPABLE_MODEL='migrations.SomeFakeModel')
+    def test_create_swappable_from_abstract(self):
+        """
+        A swappable model inheriting from a hierarchy:
+        concrete -> abstract -> concrete.
+        """
+        new_apps = Apps(['migrations'])
+
+        class SearchableLocation(models.Model):
+            keywords = models.CharField(max_length=256)
+
+        class Station(SearchableLocation):
+            name = models.CharField(max_length=128)
+
+            class Meta:
+                abstract = True
+
+        class BusStation(Station):
+            bus_routes = models.CharField(max_length=128)
+            inbound = models.BooleanField(default=False)
+
+            class Meta(Station.Meta):
+                app_label = 'migrations'
+                apps = new_apps
+                swappable = 'TEST_SWAPPABLE_MODEL'
+
+        station_state = ModelState.from_model(BusStation)
+        self.assertEqual(station_state.app_label, 'migrations')
+        self.assertEqual(station_state.name, 'BusStation')
+        self.assertEqual(
+            [x for x, y in station_state.fields],
+            ['searchablelocation_ptr', 'name', 'bus_routes', 'inbound']
+        )
+        self.assertEqual(station_state.fields[1][1].max_length, 128)
+        self.assertEqual(station_state.fields[2][1].null, False)
+        self.assertEqual(
+            station_state.options,
+            {'abstract': False, 'swappable': 'TEST_SWAPPABLE_MODEL', 'indexes': []}
+        )
+        self.assertEqual(station_state.bases, ('migrations.searchablelocation', ))
+        self.assertEqual(station_state.managers, [])
+
     @override_settings(TEST_SWAPPABLE_MODEL='migrations.SomeFakeModel')
     def test_custom_manager_swappable(self):
         """