app/code/core/Mage/Poll/Model/Mysql4/Poll/Vote.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_Poll
 * @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)
 */

/**
 * Poll vote resource model
 *
 * @category    Mage
 * @package     Mage_Poll
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Poll_Model_Mysql4_Poll_Vote extends Mage_Core_Model_Mysql4_Abstract
{
    protected function _construct()
    {
        $this->_init('poll/poll_vote', 'vote_id');
    }

    /**
     * Perform actions after object save
     *
     * @param Varien_Object $object
     */
    protected function _afterSave(Mage_Core_Model_Abstract $object)
    {
        /**
         * Increase answer votes
         */
        $answerTable = $this->getTable('poll/poll_answer');
        $pollAnswerData = array('votes_count' => new Zend_Db_Expr('votes_count+1'));
        $condition = $this->_getWriteAdapter()->quoteInto("{$answerTable}.answer_id=?", $object->getPollAnswerId());
        $this->_getWriteAdapter()->update($answerTable, $pollAnswerData, $condition);

        /**
         * Increase poll votes
         */
        $pollTable = $this->getTable('poll/poll');
        $pollData = array('votes_count' => new Zend_Db_Expr('votes_count+1'));
        $condition = $this->_getWriteAdapter()->quoteInto("{$pollTable}.poll_id=?", $object->getPollId());
        $this->_getWriteAdapter()->update($pollTable, $pollData, $condition);
        return $this;
    }
}

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