问节点索引中的术语表类型

EN

function wtc_glossary_search_api_alter_callback_info() {
  $callbacks['wtc_glossary_alter_add_first_letter_title'] = array(
    'name' => t('First letter of listing title'),
    'description' => t("This module provides first letter of title for glossary view."),
    'class' => 'WtcAlterAddFirstLetter',
  );

  return $callbacks;
}

/**
 * Search API data alteration callback that adds the first letter of title  for glossary mode
 */
class WtcAlterAddFirstLetter extends SearchApiAbstractAlterCallback {

  public function alterItems(array &$items) {
    foreach ($items as $id => &$item) {
      if (!isset($item->FIELD_YOU_NEED)) {
        $item->search_api_title_first_letter = NULL;
        continue;
      }
      $item->search_api_title_first_letter = substr($item->FIELD_YOU_NEED,0,1);
    }
  }

  public function propertyInfo() {
    return array(
      'search_api_title_first_letter' => array(
        'label' => t('First Letter of FIELD_YOU_NEED'),
        'description' => t('For for listings in glossary mode.'),
        'type' => 'text',
      ),
    );
  }

}