hb/server/app/Models/BaseDistrict.php

<?php

namespace App\Model;

use Illuminate\Database\Eloquent\Model;

class BaseDistrict extends Model
{
    protected $table   = 'base_district';
    protected $guarded = [];

    public function province()
    {
        return $this->belongsTo(BaseDistrict::class, 'pid', 'id');
    }

    public function city()
    {
        return $this->belongsTo(BaseDistrict::class, 'pid', 'id');
    }

    //    public function communities()
    //    {
    //        return $this->hasMany(Communities::class,'area_id','id');
    //    }
}