autocde2.0/app/Models/Department.php

<?php

namespace App\Models;

use App\Models\Scopes\CompanyScope;
use EloquentFilter\Filterable;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Department extends Model
{
    use HasFactory,Filterable;

    protected $table = 'department';
    protected $fillable = [
        'name',
        'parent_id',
        'company_id',
        'manager_id',
    ];



    protected static function booted()
    {
        parent::booted(); // TODO: Change the autogenerated stub

        static::addGlobalScope(new CompanyScope);
    }

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