Exemplo de implementação do Repositório

gistfile1.php

<?php

//------------------------------------
// StudentRepository.php
//------------------------------------
namespace App\Repositories\Students;
use Prettus\Repository\Contracts\RepositoryInterface;

/**
 * Interface StudentRepository
 * @package App\Repositories\Students
 */
interface StudentRepository extends RepositoryInterface {}

//------------------------------------
// StudentEloquentRepository.php
//------------------------------------
namespace App\Repositories\Students;
use Prettus\Repository\Eloquent\BaseRepository;
/**
 * Class StudentEloquentRepository
 * @package App\Repositories\Students
 */
class StudentEloquentRepository extends BaseRepository implements StudentRepository {
   
   function model()
   {
      return "App\\Student";
   }
}

//------------------------------------
// No seu Service Provider
//------------------------------------

$this->app->bind(StudentRepository::class, StudentEloquentRepository::class);

//ou

$this->app->bind('App\Repositories\Students\StudentRepository', 'App\Repositories\Students\StudentEloquentRepository');

//------------------------------------
// Usando o Repositório no seu Controller
//------------------------------------

use App\Repositories\Students\StudentRepository;
/**
 * Class StudentController
 * @package App\Http\Controllers
 */
class StudentController extends Controller {
   
   protected $repository;
   
   /**
     * @param Student $model
     */
    public function __construct(StudentRepository $repository){
        $this->repository = $repository;
    }
    
    public function index(){
       return Response::json($this->repository->all());
    }
    
    public function show($id){
       return Response::json($this->repository->find($id));
    }
    
    //...
}