public function actionLoginWithModel() { $error = null; $model = new \app\models\LoginForm(); if ($model->load(Yii::$app->request->post())) { if ($model->validate() && $model->user != null) { Yii::$app->user->login($model->user); } else { $error = 'Username/Password error'; } } return $this->render('login-with-model', ['model' => $model, 'error' => $error]); }