yii中的登录如何实现

CREATE TABLE `shop_admin` (
  `adminid` int(10) UNSIGNED NOT NULL COMMENT '主键ID',
  `adminuser` varchar(32) NOT NULL DEFAULT '' COMMENT '管理员账号',
  `adminpass` char(32) NOT NULL DEFAULT '' COMMENT '管理员密码',
  `adminemail` varchar(50) NOT NULL DEFAULT '' COMMENT '管理员邮箱',
  `logintime` int(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '登陆时间',
  `loginip` bigint(20) NOT NULL DEFAULT '0' COMMENT '登陆IP',
  `createtime` int(10) UNSIGNED NOT NULL DEFAULT '0' COMMENT '创建时间'
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

<?php
use yii\bootstrap\ActiveForm;
use yii\helpers\Html;
$form = ActiveForm::begin([
    'id' => 'abc-form',
    'options' => ['class' => 'form-horizontal'],
])?>
<?= $form->field($model, 'adminuser')->textInput(['placeholder' => "用户名"])->label('账号') ?>
<?= $form->field($model, 'adminpass')->passwordInput()->label('密码') ?>
<?= Html::submitButton('提交') ?>
<?php ActiveForm::end() ?>

<?php
namespace app\controllers;
use yii\web\Controller;
use app\models\Admin;
use Yii;
 
class IndexController extends Controller
{
    public function actionIndex()
    {
//      不使用布局
        $this->layout = false;
        $model = new Admin;
//        是否是post提交
        if (Yii::$app->request->isPost) {
//            获得post提交参数
            $post = Yii::$app->request->post();
            if($model->login($post)){
                return "登陆成功";
            } else {
                return "登陆失败";
            }
        } else {
            return $this->render("index", ['model' => $model]);
        }
    }
 
}

<?php
namespace app\models;
use yii\db\ActiveRecord;
use Yii;
class Admin extends ActiveRecord
{
    public static function tableName()
    {
        return "{{%admin}}";
    }
 
    public function rules()
    {
        return [
            ['adminuser', 'required'],
            ['adminpass', 'required'],
//           验证密码是否正确
            ['adminpass', 'validatePass']
        ];
    }
 
    public function validatePass()
    {
        if (!$this->hasErrors()) {
//            判断用户名密码是否正确
            $data = self::find()
                ->where(['adminuser' => $this->adminuser])
                ->andwhere(['adminpass' => md5($this->adminpass)])
                ->one();
            if (is_null($data)) {
                $this->addError('adminpass', 'adminuser or adminpass error');
            }
        }
    }
    public function login($data)
    {
        if($this->load($data) && $this->validate()) {
//            登陆信息写入session
            $session = Yii::$app->session;
            $session->open();
            $session->set('adminuser', $this->adminuser);
//           更新登陆时间和IP
            $this->updateAll(['logintime' => time(), 'loginip' => ip2long(Yii::$app->request->userIP)], ['adminuser' => $this->adminuser]);
            return true;
        }
        return false;
    }
}