This plugin adds versioning capabilities to you Active Record Models.

./script/plugin install acts_as_versioned

Say you have a Chapter model and you want to keep the latest 20 modifications for each chapter.

./app/models/chapter.php

<?php
 
class Chapter extends ActiveRecord
{
    var $acts_as = array('versioned' => array('limit'=>10));
}
 
?>

./app/installers/chapter_installer.php

<?php
 
Ak::import('Chapter');
Ak::loadPlugins();
 
class ChapterInstaller extends AkInstaller
{
    function up_1()
    {
        //.....
    }
 
    function up_2()
    {
        $Chapter =& new Chapter();
        $Chapter->versioned->createVersionedTable();
    }
 
    function down_1()
    {
        //.....
    }
 
    function down_2()
    {
        $Chapter =& new Chapter();
        $Chapter->versioned->dropVersionedTable();
    }
}
 
?>

• Behaviour handler

$Chapter->versioned

• Loads versions, pass true to force a db reload

$Chapter->versioned->load()

• Rolling back a version

$Chapter->versioned->revertToVersion(3);

• Same as find() but scoped to older versions

$Chapter->versioned->find();

• An array with your versions

$Chapter->versions

• Next versioned item if exists

$Chapter->versions[2]->getNext();

• Previous versioned item if exists

$Chapter->versions[2]->getPrevious();