php/app/Models/Comment.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Comment extends Model
{
    use HasFactory;

    protected $fillable = [
        'post_id',
        'user_id',
        'parent_id',
        'content',
        'votes',
    ];

    protected function casts(): array
    {
        return [
            'votes' => 'integer',
        ];
    }

    public function post()
    {
        return $this->belongsTo(Post::class);
    }

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

    public function parent()
    {
        return $this->belongsTo(Comment::class, 'parent_id');
    }

    public function replies()
    {
        return $this->hasMany(Comment::class, 'parent_id');
    }

    public function votes()
    {
        return $this->morphMany(Vote::class, 'voteable');
    }

    public function userVote($userId)
    {
        return $this->votes()->where('user_id', $userId)->first();
    }
}