创建服务时如何解决“致命错误”？

Question

我正在关注这个Drupal 8 module development 101 教程。 YouTube 视频的时间是 37:15 到 45:14。我一直收到此错误：

致命错误：在第 11 行的 C:\Users\myName\Sites\devdesktop\drupal-8.0.5\modules\dino_roar\src\Controller\RoarController.php 中找不到类 'Drupal\dino_roar\DinoServices\HelloGenerator'

文件夹结构：

HelloGenerator.php

<?php

namespace Drupal\dino_roar\DinoServices;

class HelloGenerator
{
    public function getHello($count){
        return "Gotten Hello ".$count;
    }
}

RoarController.php

<?php

namespace Drupal\dino_roar\Controller;

//use Drupal\dino_roar\DinoServices\HelloGenerator;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class RoarController extends Controller
{
    public function roar($count){
        //$helloGenerator = new HelloGenerator();
        $helloGenerator = $this->get('dino_roar.hello_generator');
        $hello = $helloGenerator->getHello($count);
        return new Response($hello);

        //return new Response("Hello World ".$count);
    }
}

dino_roar.info.yml

name: Dino ROAR
type: module
description: "ROAR at you"
package: Custom
core: 8.x

dino_roar.routing.yml

dino_says:
    path: /dino/says/{count}
    defaults:
        _controller: '\Drupal\dino_roar\Controller\RoarController::roar'
    requirements:
        _permission: 'access content'

dino_roar.services.yml

services:
    dino_roar.hello_generator:
        class: Drupal\dino_roar\DinoServices\HelloGenerator

致命错误指向 RoarController.php 文件中的这行代码：$helloGenerator = new HelloGenerator();

这是 Symfony 版本。我在这个窗口中找不到说 1、2 或 3。

Answer 1

首先，您的 RoarController 类需要扩展 Controller 类

class RoarController

到

use Symfony\Bundle\FrameworkBundle\Controller\Controller

class RoarController extends Controller

编辑

好的，现在改变

public function roar($count){
    $helloGenerator = new HelloGenerator();
    $hello = $helloGenerator->getHello($count);
    return new Response($hello);

    //return new Response("Hello World ".$count);
}

到

public function roar($count){
    $helloGenerator = $this->get('dino_roar.hello_generator');
    $hello = $helloGenerator->getHello($count);
    return new Response($hello);

    //return new Response("Hello World ".$count);
}

您不了解如何使用服务，所以我邀请您阅读此http://symfony.com/doc/current/book/service_container.html#creating-configuring-services-in-the-container