usertogroup.php

См. документацию.

<?php
 
namespace Bitrix\Socialnetwork\Controller\Filter;
 
class UserToGroup extends \Bitrix\Main\Controller\Filter\Base
{
    public function getListAction($filterId, $componentName, $signedParameters)
    {
        $filterId = trim($filterId);
        $unsignedParameters = \Bitrix\Main\Component\ParameterSigner::unsignParameters($componentName, $signedParameters);
 
        return $this->getList(\Bitrix\Socialnetwork\UserToGroupTable::getUfId(), [
            'ID' => $filterId !== '' ? $filterId : 'SOCIALNETWORK_WORKGROUP_USER_LIST',
        ]);
    }
 
    public function getFieldAction($filterId, $id, $componentName, $signedParameters)
    {
        $filterId = trim($filterId);
        $id = trim($id);
        $unsignedParameters = \Bitrix\Main\Component\ParameterSigner::unsignParameters($componentName, $signedParameters);
 
        return $this->getField(\Bitrix\Socialnetwork\UserToGroupTable::getUfId(), [
            'ID' => $filterId !== '' ? $filterId : 'SOCIALNETWORK_WORKGROUP_USER_LIST',
        ], $id);
    }
}