Fixed #31645 -- Enhanced the migration warning for migrate commmand.

Added the list of apps with changes not reflected in migrations.

django/core/management/commands/migrate.py

@@ -227,8 +227,9 @@ class Command(BaseCommand):
                 changes = autodetector.changes(graph=executor.loader.graph)
                 if changes:
                     self.stdout.write(self.style.NOTICE(
-                        "  Your models have changes that are not yet reflected "
+                        "  Your models in app(s): %s have changes that are not "
-                        "in a migration, and so won't be applied."
+                        "yet reflected in a migration, and so won't be "
+                        "applied." % ", ".join(repr(app) for app in sorted(changes))
                     ))
                     self.stdout.write(self.style.NOTICE(
                         "  Run 'manage.py makemigrations' to make new "

tests/migrations/test_commands.py

@@ -890,6 +890,40 @@ class MigrateTests(MigrationTestBase):
         applied_migrations = recorder.applied_migrations()
         self.assertNotIn(("migrations", "0001_initial"), applied_migrations)
 
+    @override_settings(INSTALLED_APPS=[
+        'migrations.migrations_test_apps.migrated_unapplied_app',
+        'migrations.migrations_test_apps.migrated_app',
+    ])
+    def test_migrate_not_reflected_changes(self):
+        class NewModel1(models.Model):
+            class Meta():
+                app_label = 'migrated_app'
+
+        class NewModel2(models.Model):
+            class Meta():
+                app_label = 'migrated_unapplied_app'
+
+        out = io.StringIO()
+        try:
+            call_command('migrate', verbosity=0)
+            call_command('migrate', stdout=out, no_color=True)
+            self.assertEqual(
+                "operations to perform:\n"
+                "  apply all migrations: migrated_app, migrated_unapplied_app\n"
+                "running migrations:\n"
+                "  no migrations to apply.\n"
+                "  your models in app(s): 'migrated_app', "
+                "'migrated_unapplied_app' have changes that are not yet "
+                "reflected in a migration, and so won't be applied.\n"
+                "  run 'manage.py makemigrations' to make new migrations, and "
+                "then re-run 'manage.py migrate' to apply them.\n",
+                out.getvalue().lower(),
+            )
+        finally:
+            # Unmigrate everything.
+            call_command('migrate', 'migrated_app', 'zero', verbosity=0)
+            call_command('migrate', 'migrated_unapplied_app', 'zero', verbosity=0)
+
 
 class MakeMigrationsTests(MigrationTestBase):
     """