Nested Routes in Laravel 4

route.php

<?php
Route::group(['prefix' => 'forum/{fId}'], function() 
{
        Route::resource('topic/{tId}', 'TopicController');
});
Route::resource('forum', 'ForumController');

class TopicController extends BaseController 
{
 
        public function index($fId, $tId) {
                return "Topic ID {$tId} in Forum ID {$fId}";
        }
 
        // --- other methods
 
}

class ForumController extends BaseController
{
        
        public function index($fId) 
        {
                return "Forum ID {$fId}";
        }
        
        // --- other methods
}