public function scopeHotArticle($query)
  {
    return $query->orderBy('comment_count','desc')->first();
  }

  public function getIndex()
  {
    $hot = Article::hotArticle();
    dd($hot);
  }

  public function scopeCommentMoreThan($query, $comment)
  {
    return $query->where('comment_count','>',$comment);
  }

  public function getIndex()
  {
    $articles = Article::commentMoreThan(10)->orderBy('comment_count', 'desc')->get();
    foreach ($articles as $article){
      echo $article->title . '  ' . $article->comment_count;
      echo "<br />";
    }
  }