public function detail($slug){

        $record = $this->Article->findBySlug($slug);

        $this->set('record', $record['Article']);

$slug = 'doi-tac'
$record = array()

ArticlesController::detail() - APP/Controller/ArticlesController.php, line 5
ReflectionMethod::invokeArgs() - [internal], line ??
Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 490
Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 191
Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 165
[main] - APP/webroot/index.php, line 108