Using cursor instead of pagination with Fractal. IE: GET /users?cursor=5

ApiController.php

<?php

use League\Fractal\Manager;
use League\Fractal\Resource\Collection;
use League\Fractal\Resource\Item;
use League\Fractal\Cursor\CursorInterface;

class ApiController extends Controller
{
  
    public function __construct()
    {
        $this->fractal = new Manager;

        $this->fractal->setRequestedScopes(explode(',', Input::get('include')));
    }
    
    protected function respondWithCursor($collection, $callback, CursorInterface $cursor)
    {
        $resource = new Collection($collection, $callback);
        $resource->setCursor($cursor);

        $rootScope = $this->fractal->createData($resource);

        return $this->respondWithArray($rootScope->toArray());
    }
    
}

UsersController.php

<?php

use League\Fractal\Cursor\Cursor;

class UsersController extends ApiController
{

    public function index()
    {
        $current = Input::get('cursor', false);

        $users = new User;

        if ($current and is_numeric($current)) {
            $users = $users->where('id', '>', $current);
        }

        $users = $users->take(20)->get();

        $cursor = new Cursor($current, $users->last()->id, $users->count());

        return $this->respondWithCursor($users, new UserTransformer, $cursor);
    }
    
}

?? eturn $this->respondWithArray($rootScope->toArray()); ?? I can not find this line of code APiController