setup/includes/upgrades/common/2.4-tmplvar-index.php
<?php
/**
* New Index for modAccessResourceGroup
*
* @var modX $modx
* @package setup
*/
/* add modAccessResourceGroup.principal_class index */
$class = 'modTemplateVarResourceGroup';
$table = $modx->getTableName($class);
$description = $this->install->lexicon('add_index',array('index' => 'tmplvar_template','table' => $table));
$this->processResults($class, $description, array($modx->manager, 'addIndex'), array($class, 'tmplvar_template'));