Method __construct

/**
 * Constructor
 *
 * @param   DatabaseDriver  $db  A database connector object
 *
 * @since   3.1
 */
public function __construct(DatabaseDriver $db)
{
    parent::__construct('#__history', 'version_id', $db);
    $this->ignoreChanges = array('modified_by', 'modified_user_id', 'modified', 'modified_time', 'checked_out', 'checked_out_time', 'version', 'hits', 'path');
    $this->convertToInt = array('publish_up', 'publish_down', 'ordering', 'featured');
}