findBySlug() public static method

public static findBySlug ( string $slug ) : Article
$slug string
return app\models\Article
 public function index(...$articleSlugs)
 {
     $articleSlug = collect($articleSlugs)->last();
     $article = ArticleRepository::findBySlug($articleSlug);
     if ($article->hasChildren()) {
         return redirect($article->firstChild->fullUrl);
     }
     return view('front.article.index')->with(compact('article'));
 }