takeone-youtube-clone/app/Models/PostImage.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class PostImage extends Model
{
    protected $fillable = ['post_id', 'filename', 'sort_order'];

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

    public function getImageUrlAttribute(): string
    {
        return asset('storage/post_images/' . $this->filename);
    }
}