// 如果这里用到了验证码，就会出问题

$model = new Test();

$model->validate();

$model->save();

// 这样是正确的

$model = new Test();
// 把需要验证的 attribute 放进去，排除验证码字段
$model->validate(array('test1','test2'));

$model->save()

<?php

class CaptchaAction extends CCaptchaAction 
{
 public function validate($input, $caseSensitive)
 {
 $code = $this->getVerifyCode();
 $valid = $caseSensitive ? ($input === $code) : !strcasecmp($input, $code);
 $session = Yii::app()->session;
 $session->open();
 $name = $this->getSessionKey() . 'count';
 if (!Yii::app()->request->isAjaxRequest) {
  $session[$name] = $session[$name] + 1;
 }

 // 这里会重新生成
 if ($session[$name] > $this->testLimit && $this->testLimit > 0) {
  $this->getVerifyCode(true);
 }
 return $valid;
 }
}