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<?php
/**
 *
 * This file is part of the phpBB Forum Software package.
 *
 * @copyright (c) phpBB Limited <https://www.phpbb.com>
 * @license GNU General Public License, version 2 (GPL-2.0)
 *
 * For full copyright and license information, please see
 * the docs/CREDITS.txt file.
 *
 */
namespace phpbb\db\migration\data\v32x;
class user_notifications_table_unique_index extends \phpbb\db\migration\migration
{
    static public function depends_on()
    {
        return array(
            '\phpbb\db\migration\data\v32x\user_notifications_table_remove_duplicates',
        );
    }
    public function update_schema()
    {
        return array(
            'drop_keys'            => array(
                $this->table_prefix . 'user_notifications' => array(
                    'itm_usr_mthd',
                ),
            ),
            'add_unique_index'  => array(
                $this->table_prefix . 'user_notifications' => array(
                    'itm_usr_mthd'    => array('item_type', 'item_id', 'user_id', 'method'),
                ),
            ),
        );
    }
    public function revert_schema()
    {
        return array(
            'drop_keys' => array(
                $this->table_prefix . 'user_notifications' => array(
                    'itm_usr_mthd',
                ),
            ),
        );
    }
}