After upgrading from conditional_fields 4.x-alpha5 to 4.x-alpha6, an error occurs when handling paragraphs in the ConditionalFieldsFormHelper class.

Created on 17 February 2025, about 2 months ago

Problem/Motivation

Steps to reproduce

Use a paragraph field with conditional fields enabled.

Ensure no specific form mode is explicitly selected.

Attempt to use the conditional logic that depends on the paragraph field.

The following error occurs:
Error : Call to a member function getComponent() on null in Drupal\conditional_fields\ConditionalFieldsFormHelper->getState()
(ligne 371 de /var/www/preprod_filiale/releases/20250117120019Z/web/modules/contrib/conditional_fields/src/ConditionalFieldsFormHelper.php).

Proposed resolution

### **Proposed resolution**
- The issue occurs because `$form_settings['form_display_mode']` returns the first unchecked form display mode instead of the default when no specific form mode is selected.
- This causes `$form_display` to be `null`, leading to an error when calling `getComponent()`.
- The fix ensures that the correct form display mode is always used by replacing:
```php
$form_settings = $form_display->getComponent($first_field)['settings'];
$form_display_mode = $form_settings['form_display_mode'];