Add checkout i18n DB columns for basket/checkout stability

mandelstudio/migrations/0005_checkout_i18n_columns.py

@@ -0,0 +1,56 @@
+from django.db import migrations
+
+
+LANGUAGES = ("en", "de", "fr", "es", "it", "pt", "ru")
+
+
+def _add_column_if_missing(schema_editor, table_name, column_name, column_sql):
+    connection = schema_editor.connection
+    with connection.cursor() as cursor:
+        existing = {
+            row.name
+            for row in connection.introspection.get_table_description(cursor, table_name)
+        }
+        if column_name in existing:
+            return
+        quoted_table = schema_editor.quote_name(table_name)
+        quoted_column = schema_editor.quote_name(column_name)
+        cursor.execute(
+            f"ALTER TABLE {quoted_table} ADD COLUMN {quoted_column} {column_sql}"
+        )
+
+
+def add_checkout_i18n_columns(apps, schema_editor):
+    for lang in LANGUAGES:
+        _add_column_if_missing(
+            schema_editor,
+            "checkout_fixedsurcharge",
+            f"name_{lang}",
+            "varchar(32) NULL",
+        )
+        _add_column_if_missing(
+            schema_editor,
+            "checkout_percentagesurcharge",
+            f"name_{lang}",
+            "varchar(32) NULL",
+        )
+        _add_column_if_missing(
+            schema_editor,
+            "checkout_paymentmethod",
+            f"label_{lang}",
+            "varchar(32) NULL",
+        )
+
+
+class Migration(migrations.Migration):
+    dependencies = [
+        ("mandelstudio", "0004_contact_messages"),
+        ("checkout", "0017_remove_unused_price_fields"),
+    ]
+
+    operations = [
+        migrations.RunPython(
+            add_checkout_i18n_columns,
+            migrations.RunPython.noop,
+        )
+    ]