function entity_reference_field_settings_form

Implements hook_field_settings_form().

File

drupal/core/modules/entity_reference/entity_reference.module, line 146

Provides a field that can reference other entities.

Code

function entity_reference_field_settings_form($field, $instance, $has_data) {

  // Select the target entity type.
  $entity_type_options = array();
  foreach (entity_get_info() as $entity_type => $entity_info) {

    // @todo As the database schema can currently only store numeric IDs of
    // referenced entities and configuration entities have string IDs, prevent
    // configuration entities from being referenced.
    if (!in_array('\\Drupal\\Core\\Config\\Entity\\ConfigEntityInterface', class_implements($entity_info['class']))) {
      $entity_type_options[$entity_type] = $entity_info['label'];
    }
  }
  $form['target_type'] = array(
    '#type' => 'select',
    '#title' => t('Type of item to reference'),
    '#options' => $entity_type_options,
    '#default_value' => $field['settings']['target_type'],
    '#required' => TRUE,
    '#disabled' => $has_data,
    '#size' => 1,
  );
  return $form;
}