Hello.

I am trying to write a plugin (Elgg 2.2.1), that, after a new user validates registration by email (and only after the user is validated), creates a new group based on some of the data submitted by registration form and joins the user to this new group. Also, the new group should not be created and owned by newly registered user, but by special "administrator" user, which is intended owner of all the groups created in such manner.

I tried doing it like this:

in start.php:

elgg_register_plugin_hook_handler( 'action', 'uservalidationbyemail/validate', 'validate_action_hook' );

function validate_action_hook($hook, $type, $value, $params) {
    $user = elgg_get_logged_in_user_entity();
    if( elgg_get_user_validation_status($user->guid) == true ) {
        $userdata1 = $user->data1;
        $userdata2 = $user->data2;
        $groupname = $address.' '.$city;
        $group = elgg_get_entities_from_metadata( array( 'type' => 'group', 'metadata_name_value_pairs' => array( array( 'name' => 'name', 'value' => $groupname ) ) ) );
        if( !elgg_instanceof($group, 'group') ) {
            $gdesc = $groupname;
            $group_owner_guid = elgg_get_entities_from_metadata( array( 'type' => 'user', 'metadata_name_value_pairs' => array( array( 'name' => 'username', 'value' => 'administrator' ) ) ) )->guid;
            $group = new ElggGroup();
            $group->subtype = 'subtype1';
            $group->name = $groupname;
            $group->description = $gdesc;
            $group->membership = ACCESS_PRIVATE;
            $group->owner_guid = $group_owner_guid;
            $group->save();
        }
        $group->join( $user );
        return true;
    }
    return false;
}

Unfortunately, this doesn't work, and the Elgg documentation wasn't very helpful with providing me the right answers.