sam-api/app/Models/Commons/Menu.php

<?php

namespace App\Models\Commons;

use Illuminate\Database\Eloquent\Model;

class Menu extends Model
{
    protected $fillable = [
        'tenant_id', 'parent_id', 'name', 'url', 'is_active', 'sort_order',
        'hidden', 'is_external', 'external_url', 'icon'
    ];

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

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