How do I resolve a "Fatal error" when creating a service? - symfony

Question

I'm following this Drupal 8 module development 101 tutorial. It's between 37:15 to 45:14 on the YouTube video. I kept getting this error:
Fatal error: Class 'Drupal\dino_roar\DinoServices\HelloGenerator' not found in C:\Users\myName\Sites\devdesktop\drupal-8.0.5\modules\dino_roar\src\Controller\RoarController.php on line 11
Folder structure:
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
The fatal error points to this line of code in the RoarController.php file: $helloGenerator = new HelloGenerator();
This is the Symfony version. I can't find it say 1,2, or 3 in this window.

Answer 1

First of all, your RoarController class needs to extends the Controller class
class RoarController
to
use Symfony\Bundle\FrameworkBundle\Controller\Controller
class RoarController extends Controller
EDIT
Ok now change
public function roar($count){
$helloGenerator = new HelloGenerator();
$hello = $helloGenerator->getHello($count);
return new Response($hello);
//return new Response("Hello World ".$count);
}
to
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);
}
You didn't understand how use services that why I invite you to read this http://symfony.com/doc/current/book/service_container.html#creating-configuring-services-in-the-container