movies/app/Models/Forum/Post.php

<?php

namespace App\Models\Forum;

use App\Models\User;
use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    protected $table = 'forum_posts';

    protected $fillable = [
        'content',
        'user_id',
        'category_id',
        'thread_id',
        'topic_id',
    ];

    public function author()
    {
        return $this->hasOne(User::class, 'id', 'user_id');
    }
}