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Editing: Region.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Region extends Model
{
    protected $table = 'regions';
    public $timestamps = false;
    protected $dateFormat = 'U';
    protected $guarded = ['id'];

static $country = 'country';
    static $province = 'province';
    static $city = 'city';
    static $district = 'district';

static $types = [
        'country',
        'province',
        'city',
        'district',
    ];

public function country()
    {
        return $this->belongsTo($this, 'country_id', 'id')->where('type', self::$country);
    }

public function countryProvinces()
    {
        return $this->hasMany($this, 'country_id', 'id')->where('type', self::$province);
    }

public function countryCities()
    {
        return $this->hasMany($this, 'country_id', 'id')->where('type', self::$city);
    }

public function provinceCities()
    {
        return $this->hasMany($this, 'province_id', 'id')->where('type', self::$city);
    }

public function cityDistricts()
    {
        return $this->hasMany($this, 'city_id', 'id')->where('type', self::$district);
    }

public function province()
    {
        return $this->belongsTo($this, 'province_id', 'id')->where('type', self::$province);
    }

public function city()
    {
        return $this->belongsTo($this, 'city_id', 'id')->where('type', self::$city);
    }

public function countryUsers()
    {
        return $this->hasMany('App\User', 'country_id', 'id');
    }

public function provinceUsers()
    {
        return $this->hasMany('App\User', 'province_id', 'id');
    }

public function cityUsers()
    {
        return $this->hasMany('App\User', 'city_id', 'id');
    }

public function districtUsers()
    {
        return $this->hasMany('App\User', 'district_id', 'id');
    }
}

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