src/Providers/RouteServiceProvider.php
public function boot()
    {
        parent::boot();

        if (Request::is('*/forum/category/*')) {
            Route::bind('category', function ($category) {
                $categoryrepo = $this->app->make('Litecms\Forum\Interfaces\CategoryRepositoryInterface');
                return $categoryrepo->findorNew($category);
            });
        }

        if (Request::is('*/forum/question/*')) {
            Route::bind('question', function ($question) {
                $questionrepo = $this->app->make('Litecms\Forum\Interfaces\QuestionRepositoryInterface');
                return $questionrepo->findorNew($question);
            });
        }

        if (Request::is('*/forum/response/*')) {
            Route::bind('response', function ($response) {
                $responserepo = $this->app->make('Litecms\Forum\Interfaces\ResponseRepositoryInterface');
                return $responserepo->findorNew($response);
            });
        }

    }
public function boot()
    {
        parent::boot();

        if (Request::is('*/forum/category/*')) {
            Route::bind('category', function ($category) {
                $categoryrepo = $this->app->make('Litecms\Forum\Interfaces\CategoryRepositoryInterface');
                return $categoryrepo->findorNew($category);
            });
        }

        if (Request::is('*/forum/question/*')) {
            Route::bind('question', function ($question) {
                $questionrepo = $this->app->make('Litecms\Forum\Interfaces\QuestionRepositoryInterface');
                return $questionrepo->findorNew($question);
            });
        }

        if (Request::is('*/forum/response/*')) {
            Route::bind('response', function ($response) {
                $responserepo = $this->app->make('Litecms\Forum\Interfaces\ResponseRepositoryInterface');
                return $responserepo->findorNew($response);
            });
        }

    }
Define your route model bindings, pattern filters, etc.

@param   \Illuminate\Routing\Router  $router
@return void