[Studion UI] TypeError: e is not iterable when adding the first option to a Select field with no configured options (class editor)

[elements-team]

Affected Version

2026.2

Affected capability

Data Objects

Steps to reproduce

1. Open the class editor (Data Management → Data Model Definitions → Classes) for any class that has a select datatype field whose options were never configured
2. Select the field in the tree, scroll to Specific Settings → Select Options. The grid shows "No data available yet."
3. Click the Add button above the grid to add the first option row.

Actual Behavior

The browser console throws:

TypeError: e is not iterable
    at Object.addRow (__federation_expose_app.<hash>.js:3356:1401)
    at Object.onClick (__federation_expose_modules__field_definitions.<hash>.js:6:28310)
    ...

No row is added; the grid remains empty and the field cannot be given any options through the UI.

Root cause

• The class-definition API (GET /pimcore-studio/api/class/definition/configuration-view/detail/{id}/layout) serializes the field's options as null (not []) when no options have ever been set:

    {"name":"status", ..., "options":null, ...}

• The frontend addRow handler appears to spread/iterate the current options value directly (something like [...currentOptions, newRow]) without guarding against null, which throws TypeError: e is not iterable instead of treating a missing/null value as an empty array.

Workaround

Manually edit the class definition export (var/classes/definition_ClassName.php) and change the field's

'options' => NULL,

to

'options' =>
  array (
  ),

then clear the Symfony cache. After that, the API returns "options":[] and the Add button works normally.

Suggested fix

Either:

• Have the backend serialize options as [] instead of null when empty (defensive default at the ClassDefinition\Data\Select model level), and/or
• Guard addRow (and any other place that spreads/iterates options) against a null/undefined value on the frontend

Expected Behavior

A new empty, editable option row is added to the grid.