iao_team/app/Models/Category.php

<?php

namespace App\Models;

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

class Category extends Model
{
    use HasFactory;

    protected $fillable = [
        'parent_id',
        'name',
        'enabled'
    ];

    public function parent()
    {
        return $this->belongsTo(Category::class);
    }

}