View file ProForum/Files/application/app/Models/PostImage.php

<?php

namespace App\Models;

use App\Models\Post;
use App\Models\User;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Factories\HasFactory;

class PostImage extends Model
{
    use HasFactory;
    protected $guarded= ['id'];

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

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