Repository Pattern on Laravel

1) In my file AuteurRepository how should I create my function index()?

You can give it the name what you want, index(), allRecords(), ... . And perform the query you need.

My second question is in my AuteurController I don't understand what to do ?

If your repository looks like this:

class AuteurRepository{    public function index()    {        return Auteur::oldest()->paginate(5);    }}

In your controller you can access the repo index function like this:

class AuteurController extends Controller{    protected $auteurs;    public function __construct(AuteurRepository $auteurs)    {        $this->auteurs = $auteurs;     }    public function index(Request $request)    {        $auteurs = $this->auteurs->index();        return view('admin.auteurs.index', compact('auteurs'))    }}

EDIT
Also, you can customize a bit the query. For example:

In the repository accept a parameter in the index method:

class AuteurRepository{    public function index($filters)    {        $pagination = $filters['pagination'];        $order = $filters['order'];        return Auteur::orderBy('created_at', $order)                       ->paginate($pagination);    }}

And in the controller create the array to pass as parameter:

    $filters = [        'pagination' => 5,        'order' => 'asc',    ];

or

    $filters = [        'pagination' => 10,        'order' => 'desc',    ];

Or you can get the values from the request (be sure to leave a default value in case the request input is null)

    $filters = [        'pagination' => $request->input('pagination')?: 5,        'order' => $request->input('order')?: 'asc',    ];

and then pass the parameter to the repo:

    $auteurs = $this->auteurs->index($filters);

Hope it helps ;-)