Merge branch 'fix-migration-variable-name' into 'master'

Fix migration variable name

See merge request !172

CHANGELOG.rst

@@ -9,6 +9,11 @@ and this project adheres to `Semantic Versioning`_.
 Unreleased
 ----------
 
+Fixed
+~~~~~
+
+* Migrations failed in some cases due to programming mistake.
+
 `3.0`_ - 2023-05-15
 -------------------
 

aleksis/apps/untis/migrations/0003_guess_school_id.py

@@ -16,7 +16,7 @@ def guess_school_id(apps, schema_editor):
     if not vr or not vr.school_id_untis:
         return
 
-    get_site_preferences()["untis_mysql__school_id"] = school_id
+    get_site_preferences()["untis_mysql__school_id"] = vr.school_id_untis
 
 
 class Migration(migrations.Migration):