loginform.php

<?php

/**
 * LoginForm class.
 * LoginForm is the data structure for keeping
 * user login form data. It is used by the 'login' action of 'SiteController'.
 */
class LoginForm extends CFormModel
{
    public $leraarCode;
    public $password;

    /**
     * Declares the validation rules.
     * The rules state that username and password are required,
     * and password needs to be authenticated.
     */
public function rules()
{
    return array(
        array('leraarCode, password', 'required'),
        array('leraarCode','leraarCode'),
        array('password', 'authenticate'),
    );
}

    /**
     * Declares attribute labels.
     */
    public function attributeLabels()
    {
        return array(
            'leraarCode'=>'leraarCode',
        );
    }

    /**
     * Authenticates the password.
     * This is the 'authenticate' validator as declared in rules().
     */
    public function authenticate($attribute,$params)
    {
        if(!$this->hasErrors())  // we only want to authenticate when no input errors
        {
            $identity=new UserIdentity($this->leraarCode,$this->password);
            $identity->authenticate();
            switch($identity->errorCode)
            {
                case UserIdentity::ERROR_NONE:
                    Yii::app()->user->login($identity);
                    break;
                case UserIdentity::ERROR_USERNAME_INVALID:
                    $this->addError('leraarCode','leraarCode is incorrect.');
                    break;
                default: // UserIdentity::ERROR_PASSWORD_INVALID
                    $this->addError('password','Password is incorrect.');
                    break;
            }
        }
    }
}