app\Vote::user PHP Method

    public function user()
    {
        return $this->belongsTo(User::class);
    }

 public function vote($subName, $slug, $value)
 {
     if (!in_array($value, [-1, 0, 1])) {
         abort(400);
     }
     $sub = Sub::where('name', $subName)->firstOrFail();
     $post = Post::where('slug', $slug)->where('sub_id', $sub->id)->firstOrFail();
     try {
         $vote = $post->votes()->where('user_id', auth()->id())->firstOrFail();
     } catch (ModelNotFoundException $e) {
         $vote = new Vote();
     }
     $vote->value = $value;
     $vote->user()->associate(auth()->user());
     $vote->voteable()->associate($post);
     $vote->save();
     $post->score += $value;
     $post->save();
 }