MODX Revo indexer plugin. Allows fast TV filter searches using custom snippet (not included)

indexer.plugin.php

<?php
/*
* MODX Revo indexer plugin. Allows fast TV filter searches using custom snippet (not included)
* 
* License: public domain
*
* Created by: Jeroen Kenters / www.kenters.com
* First released: 2012-02-21 (yyyy-mm-dd)
*
* !!!!!!!Important!!!!!!!
* You need to change this! This won't work out of the box! 
* If you created CMPs before this should be an easy thing to do. Otherwise: hire someone to do the job :-)
*
* Events (check this in the plugins System Events tab:
* - onDocFormSave
* - onDocFormDelete
* - onResourceUndelete
* 
* Example schema: 
* <?xml version="1.0" encoding="UTF-8"?>
* <model package="myindex" baseClass="xPDOObject" platform="mysql" defaultEngine="MyISAM">
*
*    <object class="myObj" table="myindex_objects" extends="xPDOSimpleObject">
*        <field key="resource" dbtype="int" precision="20" attributes="unsigned" null="false" default="0" />
*        <field key="pagetitle" dbtype="varchar" precision="255" phptype="string" null="false" default="" />
*        <field key="field1" dbtype="varchar" precision="255" phptype="string" null="false" default="" />
*        <field key="field2" dbtype="varchar" precision="255" phptype="string" null="false" default="" />
*        <field key="mytv1" dbtype="text" phptype="string" />
*        <field key="mytv2" dbtype="text" phptype="string" />
*        <field key="overviewimg" dbtype="varchar" precision="255" phptype="string" null="false" default="" />
*    </object>
*
* </model> 
* 
*/

$action = false; //save, delete or false (none)
$objtype = false; //you can have different indexable objects (hotels, cars, jobs, etc.)

$eventName = $modx->event->name;
switch($eventName) {
    case 'OnDocFormSave':
    case 'OnResourceUndelete':
        $action = 'save';
        break;
    case 'OnDocFormDelete':
        $action = 'delete';
        break;
    default:
        $action = false;
}

if($eventName == 'OnResourceUndelete') {
    //OnResourceUndelete: $resource not available
    $resource = $modx->getObject('modResource', $id);
}

if($resource->get('deleted') == 1 || $resource->get('published') != 1) {
    $action = 'delete';
}

if($action != false) {
    //check if this is an indexable resource based on template id
	//change this if you have other conditions to determine object type
    $template = $resource->get('template');
    switch($template) {
        case 4:
            $objtype = 'myObj';
            break;
        case 5:
            $objtype = 'myObj2';
            break;
        case 6:
            $objtype = 'myObj3';
            break;
        default:
            $objtype = false; //not an indexable object
    }

	//add package only if we found an indexable object
    if($objtype != false) {
        $modx->addPackage('myindex', $modx->getOption('core_path').'components/myindex/model/');
    }
}

//create/modify index object when resource is saved
if($action == 'save' && $objtype != false) {
    //get or create index object
    $obj = $modx->getObject($objtype, array('resource' => $resource->get('id')));
    if(!is_object($obj)) {
        $obj = $modx->newObject($objtype);
    }

    //we need the raw value of these 2 TVs, others can be the resource/processed value
    $myTV1 = $modx->getObject('modTemplateVar', array('name' => 'myTV1'));
    $myTV2 = $modx->getObject('modTemplateVar', array('name' => 'myTV2'));

    //set index properties
    $obj->fromArray(array(
        'resource' => $resource->get('id'),
        'pagetitle' => $resource->get('pagetitle'),
        'field1' => $resource->getTVValue('field1'),
        'field2' => $resource->getTVValue('field2'),
        'mytv1' => $myTV1->getValue($resource->get('id')),
        'mytv2' => $myTV2->getValue($resource->get('id')),
        'overviewimg' => $resource->getTVValue('overviewimg')
    ));

    //save index object
    $obj->save();
}

//remove index object when resource is deleted/unpublished
elseif($action == 'delete' && $objtype != false) {
    $modx->removeCollection($objtype, array('resource' => $resource->get('id')));
}

return;