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/* 
Inherit resource groups only if resource is new 

Source: http://forums.modx.com/thread/79531/inheriting-resource-groups
Author: paulmerchant (http://forums.modx.com/u/paulmerchant)
Compatible 2.2.x

Not tested with 2.3.x (might even not be necessary anymore in 2.3.x ...)

*/

if ($mode == modSystemEvent::MODE_NEW) {
    
   /* get the id of the parent */
   $parentId = $_POST['parent'];
 
   /* get all the resource group data of the parent as a collection */
   $groupCollection = $modx->getCollection('modResourceGroupResource', array('document'=>$parentId));
 
   /* join the resource to resource groups in the collection */
   foreach($groupCollection as $group) {
      $success = $resource->joinGroup($group->get('document_group'));
   }
}