Hi, everyone. I want to ask about an error in login action. Let say that i have an application. Those are my code…
EWebUser.php
<?php
class EWebUser extends CWebUser{
protected $_model;
protected function loadUser()
{
if ( $this->_model === null ) {
$this->_model = StaffDb::model()->findByPk($this->id);
}
return $this->_model;
}
function getLevel()
{
$user=$this->loadUser();
if ($user->kdstpeg == 02){
if(substr($user->kdorg,1,4) == '0000') $level=1;
else if (substr($user->kdorg,2,3) == '000') $level=2;
return $level;
}
return 100;
}
UserIdentity.php
<?php
/**
* UserIdentity represents the data needed to identity a user.
* It contains the authentication method that checks if the provided
* data can identity the user.
*/
class UserIdentity extends CUserIdentity
{
private $_id;
public function authenticate()
{
$username = strtolower($this->username);
$user = MUser::model()->find('LOWER(username)=?', array($username));
if($user===null)
$this->errorCode=self::ERROR_USERNAME_INVALID;
else if ($user->pwd!=$this->password)
$this->errorCode = self::ERROR_PASSWORD_INVALID;
else
{
$this->_id = $user->oldStaffCode;
$this->username = $user->username;
$this->errorCode = self::ERROR_NONE;
}
return $this->errorCode == self::ERROR_NONE;
}
public function getId()
{
return $this->_id;
}
}
and StaffDb.php (one of my model)
public static function model($className=__CLASS__)
{
return parent::model($className);
}
/**
* @return string the associated database table name
*/
public function tableName()
{
return 'staffdb';
}
/**
* @return array validation rules for model attributes.
*/
public function rules()
{
// NOTE: you should only define rules for those attributes that
// will receive user inputs.
return array(
array('oldStaffCode', 'required'),
... array('kdstpeg', 'max'=>2),
array('...', 'safe'),
// The following rule is used by search().
// Please remove those attributes that should not be searched.
array('oldStaffCode, kdstpeg, ..., 'safe', 'on'=>'search'),
);
}
public function primaryKey()
{
return 'oldStaffCode';
}
When i’m trying to access this application, the error “Trying to get property of non-object” is shown. Then, i put this code on EWebUser.php
print_r ($user);
in order to see what kind of $user’s view. But it didn’t have any effect. 
My question is, did I miss something in that codes? Because in my opinion, all of objects are complete. I hope there’s a suggestion to solve this problem. Thanks in advance. 