public function showBlog($categorySlug = null)
 {
     if ($categorySlug) {
         $category = PostCategory::findBySlug($categorySlug);
         $posts = $category->posts()->where('published', 1)->orderBy('published_at', 'desc')->simplePaginate(10);
         $filters = PostCategory::with(['posts' => function ($query) {
             $query->where('published', 1);
         }])->where('slug', '<>', $categorySlug)->get();
     } else {
         $category = $this->makeDefaultCategory();
         $posts = Post::where('published', 1)->orderBy('published_at', 'desc')->simplePaginate(10);
         $filters = PostCategory::with(['posts' => function ($query) {
             $query->where('published', 1);
         }])->get();
     }
     return view('front.blog.index')->with(compact('category', 'posts', 'filters'));
 }