app/code/core/Mage/Checkout/Model/Mysql4/Agreement.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_CheckoutAgreement
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

class Mage_Checkout_Model_Mysql4_Agreement extends Mage_Core_Model_Mysql4_Abstract
{
    protected function _construct()
    {
        $this->_init('checkout/agreement', 'agreement_id');
    }

    protected function _beforeSave(Mage_Core_Model_Abstract $object)
    {
        // format height
        $height = $object->getContentHeight();
        if (!$height) {
            $height = '';
        }
        if ($height && preg_match('/[0-9]$/', $height)) {
            $height .= 'px';
        }
        $object->setContentHeight($height);
        return parent::_beforeSave($object);
    }

    protected function _afterSave(Mage_Core_Model_Abstract $object)
    {
        $condition = $this->_getWriteAdapter()->quoteInto('agreement_id = ?', $object->getId());
        $this->_getWriteAdapter()->delete($this->getTable('checkout/agreement_store'), $condition);

        foreach ((array)$object->getData('stores') as $store) {
            $storeArray = array();
            $storeArray['agreement_id'] = $object->getId();
            $storeArray['store_id'] = $store;
            $this->_getWriteAdapter()->insert($this->getTable('checkout/agreement_store'), $storeArray);
        }

        return parent::_afterSave($object);
    }

    protected function _afterLoad(Mage_Core_Model_Abstract $object)
    {
        $select = $this->_getReadAdapter()->select()
            ->from($this->getTable('checkout/agreement_store'))
            ->where('agreement_id = ?', $object->getId());

        if ($data = $this->_getReadAdapter()->fetchAll($select)) {
            $storesArray = array();
            foreach ($data as $row) {
                $storesArray[] = $row['store_id'];
            }
            $object->setData('store_id', $storesArray);
        }

        return parent::_afterLoad($object);
    }

    protected function _getLoadSelect($field, $value, $object)
    {
        $select = parent::_getLoadSelect($field, $value, $object);

        if ($object->getStoreId()) {
            $select->join(array('cps' => $this->getTable('checkout/agreement_store')), $this->getMainTable().'.agreement_id = `cps`.agreement_id')
                    ->where('is_active=1 AND `cps`.store_id in (0, ?) ', $object->getStoreId())
                    ->order('store_id DESC')
                    ->limit(1);
        }
        return $select;
    }
}

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