Symfony, services,

[gintare]

I follow online course about Symfony.
https://www.udemy.com/introduction-to-web-development-with-symfony2/#/lecture/934594

In lecture 79 they create service for Author:

myproject\src\B log\CoreBundle\ Controller\Auth orController.ph p

class AuthorController extends Controller
{
    public function showAction($slug)
    {
        $author = $this->getAuthorManager()->findBySlug($slug);
        $posts = $this->getAuthorManager()->findPosts($author);
        
        return array(
            'author'=>$author, 
            'posts'=>$posts
        );    
       
    }

    private function getAuthorManager()
    {
        return $this->get('authorManager');
    }
}

I do not understand from where they call methods:
->findBySlug($sl ug) and ->findPosts($aut hor).

How to find this place in code?

[gintare]

They are defined in file
myproject\src\B log\CoreBundle\ Services\Author Manager.php