pp_cms/webApp/api/controllers/ArticleController.php

<?php
/**
 * Author: lf
 * Blog: https://blog.feehi.com
 * Email: job@feehi.com
 * Created at: 2017-08-30 18:10
 */
namespace api\controllers;


class ArticleController extends \yii\rest\ActiveController
{
    public $modelClass = "api\models\Article";
}