/**
* Checks if a field machine name is taken.
*
* @param string $value
* The machine name, not prefixed.
* @param array $element
* An array containing the structure of the 'field_name' element.
* @param \Drupal\Core\Form\FormStateInterface $form_state
* The current state of the form.
*
* @return bool
* Whether or not the field machine name is taken.
*/
public function fieldNameExists($value, $element, FormStateInterface $form_state) {
// Don't validate the case when an existing field has been selected.
if ($form_state->getValue('existing_storage_name')) {
return FALSE;
}
// Add the field prefix.
$field_name = $this->configFactory->get('field_ui.settings')
->get('field_prefix') . $value;
return $this->fieldManager->fieldNameExists($field_name, $this->entity->getUpdateEntityType());
}
