TicketsResGroup.php

<?php
/** @var modX $modx */
switch ($modx->event->name) {

    case 'OnDocFormSave':
        /** @var Ticket $resource */
        if ($resource->class_key == "Ticket") {
            //$modx->log(1, "TicketsResGroup ".print_r($resource->toArray(),1));
            if(!empty($resource->res_groups)){
                $resGroups = $resource->getMany('ResourceGroupResources');
                $res_groups = $resource->res_groups;

                foreach($resGroups as $old_rg){
                    $isset_group = false;
                    foreach($res_groups as $k=>$rg){
                        if($rg == 0) unset($res_groups[$k]);
                        if ($old_rg->document_group == $rg) {
                            unset($res_groups[$k]);
                            //$isset_groups = true;
                            $isset_group = true;
                        }
                    }
                    if(!$isset_group) $old_rg->remove();
                }
                if(!empty($res_groups)){ //add group
                    foreach($res_groups as $k=>$rg){
                        if($rg == 0) continue;
                        $resource->joinGroup((int)$rg);
                    }
                }
                
            }else{
                $resGroups = $resource->getMany('ResourceGroupResources');
                foreach($resGroups as $old_rg){
                    $old_rg->remove();
                }
            }
        }
        break;

}