Laravel 5 Eloquent related model return specific fields without ID

I have two models, Fair and Coordinate. Coordinate has many Fair's.

When retrieving the related Coordinate from Fair, I only want to return Longitude and Latitude, no timestamps or the ID.

When I run $fairs = Fair::with('coordinates')->get(); The Coordinate relation is Null.

If I change the select method on the belongsTo in Fair model to return $this->belongsTo('App\Coordinate', 'coordinate_id')->select(array('id', 'longitude', 'latitude'));

The response is correct, but it includes the ID.

"coordinates":{
    "id": 1,
    "longitude":"-25.704571",
    "latitude":"59.145973"
},

Is there a way to use the select method without including the ID?

I found if I also add protected $hidden = ['id']; to the Coordinate model, the response I want is correct.

"coordinates":{
     "longitude":"-25.704571",
     "latitude":"59.145973"
 },

This doesn't seem like the correct way to do it.

Fair:

namespace App;

use Illuminate\Database\Eloquent\Model;

class Fair extends Model
{
    protected $dateFormat = 'c';

    public function coordinates()
    {
        return $this->belongsTo('App\Coordinate', 'coordinate_id')->select(array('longitude', 'latitude'));
    }
}

Coordinate:

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Coordinate extends Model
{
    protected $fillable = ['longitude', 'latitude'];

    public function fairs()
    {
        return $this->hasMany('App\Fair');
    }
}

via Chebli Mohamed