setup/includes/upgrades/sqlsrv/2.2.9-pl.php
<?php
/**
* Specific upgrades for Revolution 2.2.9-pl
*
* @var modX $modx
* @package setup
* @subpackage upgrades
*/
/* Remove context_key from forward_merge_excludes System Setting */
$object = $modx->getObject('modSystemSetting', array('key' => 'forward_merge_excludes'));
if ($object) {
$value = $object->get('value');
$exploded = explode(',', $value);
$exploded = array_diff($exploded, array('context_key'));
$object->set('value', implode(',', $exploded));
$object->save();
}