<?php

namespace App\Entities;

use Myth\Auth\Entities\User as MythUser;

class User extends MythUser
{
    protected $firstName;

    protected $lastName;
}

<?php

namespace App\Models;

use Myth\Auth\Models\UserModel as BaseModel;
use App\Entities\User;

class UserModel extends BaseModel
{
    protected $returnType = User::class;

    protected $allowedFields = [
        'email', 'username', 'password_hash', 'reset_hash', 'reset_at', 'reset_expires', 'activate_hash',
        'status', 'status_message', 'active', 'force_pass_reset', 'permissions', 'deleted_at', 'first_name',
        'last_name'
    ];

$user = new \App\Entities\User();
$user->email = $this->request->getPost('email');
$user->username = $this->request->getPost('username');
$user->firstName = $this->request->getPost('first_name');
$user->lastName = $this->request->getPost('last_name');

if ($this->users->skipValidation(true)->update(user()->id, $user)) {
    return redirect()->back()->with('sweet-success', lang('dashboard.user.msg.msg_update'));
}