app/code/core/Mage/Catalog/Model/Category/Attribute/Backend/Sortby.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @copyright  Copyright (c) 2009 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Catalog Category Attribute Default and Available Sort By Backend Model
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Catalog_Model_Category_Attribute_Backend_Sortby
    extends Mage_Eav_Model_Entity_Attribute_Backend_Abstract
{
    /**
     * Validate process
     *
     * @param Varien_Object $object
     * @return bool
     */
    public function validate($object)
    {
        if (!parent::validate($object)) {
            return false;
        }

        $attributeCode = $this->getAttribute()->getName();
        if ($attributeCode == 'default_sort_by') {
            if ($available = $object->getData('available_sort_by')) {
                if (!is_array($available)) {
                    $available = split(',', $available);
                }
                if (!in_array($object->getData($attributeCode), $available)) {
                    Mage::throwException(Mage::helper('eav')->__('Default Product Listing Sort by not exists on Available Product Listing Sort by'));
                }
            }
        }

        return true;
    }

    /**
     * Before Attribute Save Process
     *
     * @param Varien_Object $object
     * @return Mage_Catalog_Model_Category_Attribute_Backend_Sortby
     */
    public function beforeSave($object) {
        $attributeCode = $this->getAttribute()->getName();
        if ($attributeCode == 'available_sort_by') {
            $data = $object->getData($attributeCode);
            if (!is_array($data)) {
                $data = array();
            }
            $object->setData($attributeCode, join(',', $data));
        }
        return $this;
    }

    public function afterLoad($object) {
        $attributeCode = $this->getAttribute()->getName();
        if ($attributeCode == 'available_sort_by') {
            $data = $object->getData($attributeCode);
            if ($data) {
                $object->setData($attributeCode, split(',', $data));
            }
        }
        return $this;
    }
}

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