[1.7.x] Fixed #23794 -- Fixed migrations crash when removing a field that's part of index/unique_together.

Backport of 72729f844e0dd9bd01b3874171b89ab0d136a40e from master

1 files changed, 16 insertions, 0 deletions

diff --git a/tests/migrations/test_autodetector.py b/tests/migrations/test_autodetector.py
index 1cf0598c85..9adbf21e4d 100644
--- a/tests/migrations/test_autodetector.py
+++ b/tests/migrations/test_autodetector.py
@@ -875,6 +875,22 @@ class AutodetectorTests(TestCase):
         self.assertOperationAttributes(changes, "otherapp", 0, 0, name="book", unique_together=set())
         self.assertOperationAttributes(changes, "otherapp", 0, 1, name="book", index_together=set())
 
+    def test_foo_together_remove_fk(self):
+        """Tests unique_together and field removal detection & ordering"""
+        # Make state
+        before = self.make_project_state([self.author_empty, self.book_foo_together])
+        after = self.make_project_state([self.author_empty, self.book_with_no_author])
+        autodetector = MigrationAutodetector(before, after)
+        changes = autodetector._detect_changes()
+        # Right number/type of migrations?
+        self.assertNumberMigrations(changes, "otherapp", 1)
+        self.assertOperationTypes(changes, "otherapp", 0, [
+            "AlterUniqueTogether", "AlterIndexTogether", "RemoveField"
+        ])
+        self.assertOperationAttributes(changes, "otherapp", 0, 0, name="book", unique_together=set())
+        self.assertOperationAttributes(changes, "otherapp", 0, 1, name="book", index_together=set())
+        self.assertOperationAttributes(changes, "otherapp", 0, 2, model_name="book", name="author")
+
     def test_foo_together_no_changes(self):
         """
         Tests that index/unique_together doesn't generate a migration if no