Named routes with optional url $ param (s) - Laravel 4

Question

I came across some quirk with L4 routing (maybe symfony2?), For which I cannot find any resources on the Internet or in the beautiful Code Bright, and appeared in IRC empty.

I try to use optional parameters with a named route through the controller, but I get an error when loading the view.

Route:

Route::get('/topic/{topicID?}', array( 'as' => 'topicDetails', 'uses' => ' TopicController@showTopic ' )); 

Controller:

 class TopicController extends BaseController { public function showTopic($topicID = null) { $data['topicID'] = $topicID; return View::make('topic_view', $data); } } 

View

 <a href="{{ route('topicDetails') }}">XXX</a> 

Error:

 Parameter "topicID" for route "topicDetails" must match "[^/]++" ("" given) to generate a corresponding URL. 

I assume that this does not pass the null value in $param , but I am not familiar enough with L4 to understand why it does not work, and I have exhausted all my resources.

Any hints would be greatly appreciated Thank you!

Answer 1

this

 <a href="{{ route('topicDetails') }}">XXX</a> 

it should be

 <a href="{{ route('topicDetails', null) }}">XXX</a>