laravel city model

City.php

<?php
namespace App\Models;

class City extends Model {
  /**
   * The database table used by the model.
   * @var string
   */
  protected $table = 'cities';
  public $timestamps = false;
  protected $fillable = [
    'state_id',
    'county_id',
    'name',
    'lat',
    'lng'
  ];
  protected $hidden = [
    'state',
    'county',
    'language'
  ];
  /**
   * return nearest cities and includes the distance
   * @param unknown $query
   * @param unknown $lat
   * @param unknown $lng
   */
  public function scopeNearest($query, $lat, $lng) {
    $db = app('db')->connection();
    $query->select($db->raw(
      '*, 111.045 * DEGREES(ACOS(COS(RADIANS('.$lat.'))' .
      ' * COS(RADIANS(lat))' .
      ' * COS(RADIANS(lng) - RADIANS('.$lng.'))' .
      ' + SIN(RADIANS('.$lat.'))' .
      ' * SIN(RADIANS(lat)))) AS distance'
    ))
    ->orderBy('distance','ASC');
  }
  public function zipcodes() {
    return $this->hasMany('App\Models\Zipcode');
  }
  public function state() {
    return $this->belongsTo('App\Models\State');
  }
  public function county() {
    return $this->belongsTo('App\Models\County');
  }
  public function language() {
    return $this->belongsTo('App\Models\Language');
  }
}