Hi… I’m newbie on learning Yii.
Right now, I’m reading yii-blog-1.1rc.pdf
On page 19, I can’t method find that belong to User::model or its parent classes… I’m confused 
<?php
class UserIdentity extends CUserIdentity
{
private $ id;
public function authenticate()
{
$username=strtolower($this->username);
$user=User::model()->find('LOWER(username)=?',array($username));
if($user===null)
$this->errorCode=self::ERROR USERNAME INVALID;
else if(md5($this->password)!==$user->password)
