Laravel Call to undefined method Illuminate\Database\Eloquent\Builder::privilege() - laravel

Question

I would like to display privileges('name') instead of idPrivilege in the user collection. I have tried to add a relationship and use it in an Eloquent call but I'm getting an error.
User model
namespace App;
use Illuminate\Notifications\Notifiable;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;
class User extends Authenticatable
{
use Notifiable;
protected $table = 'users';
protected $primaryKey = 'idUser';
protected $fillable = [
'name', 'email',
];
protected $hidden = [
'password', 'updated_at',
];
public function privilege()
{
return $this->hasOne(Privilege::class, 'idPrivilege', 'idPrivilege');
}
}
Privilege model
namespace App;
use Illuminate\Database\Eloquent\Model;
class Privilege extends Model
{
protected $table = 'privileges';
protected $primaryKey = 'idPrivilege';
protected $fillable = [
'name',
];
protected $hidden = [
'updated_at',
];
public function user()
{
return $this->belongsTo(User::class, 'idPrivilege', 'idPrivilege');
}
}
UserController
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\User;
class UserController extends Controller
{
public function relationTest()
{
return User::where('idUser', 1)->privilege()->get();
}
}
I'm getting the below error when I use with('privilege') to my User collection is added privilege collection.
Call to undefined method Illuminate\Database\Eloquent\Builder::privilege().

Answer 1

where returns a Builder instance on which a privilege method does not exist, so you can simply use it as such:
return User::find(1)->privilege()->get();;
-- EDIT
User::find(1)->with(['privilege' => function($query) {
$query->select('name');
}])->get();

Answer 2

I can achieve it by using resource:
$user = User::where('idUser', 1)->with('privilege')->first();
return UserResource::make($user);
Inside UserResource:
public function toArray($request)
{
return [
'idUser' => $this->idUser,
'name' => $this->name,
'email' => $this->email,
'privilege' => $this->privilege['name'],
'createdAt' => $this->created_at,
];
}
but was hoping there is simplier method of getting that.
output:
{
"data": {
"idUser": 1,
"name": "Martin",
"email": "martin#martin.martin",
"privilege": "user",
"createdAt": "2019-05-05T01:11:43.000000Z"
}
}