public function countAnswer($answerId)
{
$criteria = new CDbCriteria();
$criteria->condition = "questionId=:questionId and find_in_set('" . $answerId . "',content)";
$criteria->params = array(':questionId' => $this->questionId);
$count = QuestionResponse::model()->count($criteria);
return $count;
}
public function userResponse($userId)
{
$response = QuestionResponse::model()->findByAttributes(array('questionId' => $this->id, 'userId' => $userId));
return $response;
}