App\Repositories\PostRepository::doFavorite PHP 메소드

    public function doFavorite($id)
    {
        $post = $this->model->find($id);
        $post->favorite_count++;
        $post->update();
    }

 public function favorite(Request $request, $id)
 {
     $this->blog->doFavorite($id);
     if ($request->ajax()) {
         return response()->json();
     } else {
         return view('errors.404');
     }
 }