/** * Finds the Assignment model based on its primary key value. * If the model is not found, a 404 HTTP exception will be thrown. * @param string $user_id * @param string $role * @return Assignment the loaded model * @throws NotFoundHttpException if the model cannot be found */ protected function findModel($user, $role) { if (($model = Assignment::findOne(['user' => $user, 'role' => $role])) !== null) { return $model; } else { throw new NotFoundHttpException('The requested page does not exist.'); } }