<?php

class Answer extends BaseAnswer
{
    public function preSave($obj)
    {
        if ($this->getIsTrue())
        {
            $q = Doctrine_Query::create()
                ->update('Answer')
                ->set('is_true', '0')
                ->where('question_id = ?', $this->getQuestionId());

            $q->execute();
        }
    }
}