keksAccount/app/Models/Mail.php

<?php

namespace App\Models;

use Illuminate\Auth\Authenticatable;
use Laravel\Lumen\Auth\Authorizable;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Contracts\Auth\Access\Authorizable as AuthorizableContract;

class Mail extends Model
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'user_id', 'mail', 'validation_code', 'primary', 'status'
    ];

    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = [
        'validation_code',
    ];

    public function createValidationToken() {
        $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
        $randstring = '';
        for ($i = 0; $i < 20; $i++) {
            $randstring .= $characters[rand(0, strlen($characters)-1)];
        }
        $this->validation_code = $randstring;
    }

    public function getUser() {
        return User::query()->where("id", "=", $this->user_id)->first();
    }

}