function field_form_config_admin_import_form_alter

Implements hook_form_FORM_ID_alter().

Adds a warning if field data will be permanently removed by the configuration synchronization.

See also

\Drupal\field\ConfigImporterFieldPurger

File

core/modules/field/field.module, line 316

Attach custom data fields to Drupal entities.

Code

function field_form_config_admin_import_form_alter(&$form, FormStateInterface $form_state) {

  // Only display the message when there is a storage comparer available and the
  // form is not submitted.
  $user_input = $form_state
    ->getUserInput();
  $storage_comparer = $form_state
    ->get('storage_comparer');
  if ($storage_comparer && empty($user_input)) {
    $field_storages = ConfigImporterFieldPurger::getFieldStoragesToPurge($storage_comparer
      ->getSourceStorage()
      ->read('core.extension'), $storage_comparer
      ->getChangelist('delete'));
    if ($field_storages) {
      foreach ($field_storages as $field) {
        $field_labels[] = $field
          ->label();
      }
      \Drupal::messenger()
        ->addWarning(\Drupal::translation()
        ->formatPlural(count($field_storages), 'This synchronization will delete data from the field %fields.', 'This synchronization will delete data from the fields: %fields.', [
        '%fields' => implode(', ', $field_labels),
      ]));
    }
  }
}