[1.7.x] Fixed #22881 -- Better soft_applied migration detection

django/db/migrations/executor.py

@@ -132,11 +132,13 @@ class MigrationExecutor(object):
         """
         project_state = self.loader.project_state((migration.app_label, migration.name), at_end=True)
         apps = project_state.render()
+        found_create_migration = False
         for operation in migration.operations:
             if isinstance(operation, migrations.CreateModel):
                 model = apps.get_model(migration.app_label, operation.name)
                 if model._meta.db_table not in self.connection.introspection.get_table_list(self.connection.cursor()):
                     return False
-            else:
-                return False
-        return True
+                found_create_migration = True
+        # If we get this far and we found at least one CreateModel migration,
+        # the migration is considered implicitly applied.
+        return found_create_migration

tests/migrations/test_executor.py

@@ -155,6 +155,12 @@ class ExecutorTests(MigrationTestBase):
         self.assertTableNotExists("migrations_author")
         self.assertTableNotExists("migrations_tribble")
         # Run it normally
+        self.assertEqual(
+            executor.migration_plan([("migrations", "0001_initial")]),
+            [
+                (executor.loader.graph.nodes["migrations", "0001_initial"], False),
+            ],
+        )
         executor.migrate([("migrations", "0001_initial")])
         # Are the tables there now?
         self.assertTableExists("migrations_author")
@@ -171,9 +177,17 @@ class ExecutorTests(MigrationTestBase):
         # Make sure that was faked
         self.assertEqual(state["faked"], True)
         # Finally, migrate forwards; this should fake-apply our initial migration
+        executor.loader.build_graph()
+        self.assertEqual(
+            executor.migration_plan([("migrations", "0001_initial")]),
+            [
+                (executor.loader.graph.nodes["migrations", "0001_initial"], False),
+            ],
+        )
         executor.migrate([("migrations", "0001_initial")])
         self.assertEqual(state["faked"], True)
         # And migrate back to clean up the database
+        executor.loader.build_graph()
         executor.migrate([("migrations", None)])
         self.assertTableNotExists("migrations_author")
         self.assertTableNotExists("migrations_tribble")

tests/migrations/test_migrations/0001_initial.py

@@ -25,6 +25,11 @@ class Migration(migrations.Migration):
                 ("id", models.AutoField(primary_key=True)),
                 ("fluffy", models.BooleanField(default=True)),
             ],
-        )
+        ),
+
+        migrations.AlterUniqueTogether(
+            name='author',
+            unique_together=set([('name', 'slug')]),
+        ),
 
     ]