From e2fe0429abb1fafee7643b9361b808f982ddaf98 Mon Sep 17 00:00:00 2001
From: Mariusz Felisiak <felisiak.mariusz@gmail.com>
Date: Tue, 2 Nov 2021 15:34:08 +0100
Subject: [4.0.x] Fixed #33234 -- Fixed autodetector crash for proxy models
 inheriting from non-model class.

Regression in aa4acc164d1247c0de515c959f7b09648b57dc42.

Thanks Kevin Marsh for the report.
Backport of dab48b7482295956973879d15bfd4d3bb0718772 from main
---
 tests/migrations/test_autodetector.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'tests')

diff --git a/tests/migrations/test_autodetector.py b/tests/migrations/test_autodetector.py
index 67cc39dec7..fb42a8a455 100644
--- a/tests/migrations/test_autodetector.py
+++ b/tests/migrations/test_autodetector.py
@@ -1779,6 +1779,29 @@ class AutodetectorTests(TestCase):
         self.assertOperationAttributes(changes, "testapp", 0, 0, name="AuthorProxy")
         self.assertOperationAttributes(changes, "testapp", 0, 1, name="AuthorProxy", options={})
 
+    def test_proxy_non_model_parent(self):
+        class Mixin:
+            pass
+
+        author_proxy_non_model_parent = ModelState(
+            'testapp',
+            'AuthorProxy',
+            [],
+            {'proxy': True},
+            (Mixin, 'testapp.author'),
+        )
+        changes = self.get_changes(
+            [self.author_empty],
+            [self.author_empty, author_proxy_non_model_parent],
+        )
+        self.assertNumberMigrations(changes, 'testapp', 1)
+        self.assertOperationTypes(changes, 'testapp', 0, ['CreateModel'])
+        self.assertOperationAttributes(
+            changes, 'testapp', 0, 0, name='AuthorProxy',
+            options={'proxy': True, 'indexes': [], 'constraints': []},
+            bases=(Mixin, 'testapp.author'),
+        )
+
     def test_proxy_custom_pk(self):
         """
         #23415 - The autodetector must correctly deal with custom FK on proxy
-- 
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