Laravel - how to pass variable from controller to job - laravel

Question

Sorry if this is a noob question.
I used to send emails directly through the controller, like so:
Mail::to($user)->send(new RegisterConfirmation($user));
As you can see I also pass the $user into the email where I can use that user's information, like "Hello {{$user->username}}!"
But now instead I want to queue emails, so in my controller I now have this:
RegisterConfirmationJob::dispatch($user);
In my job, I have the following:
public function __construct(User $user)
{
$this->user = $user;
}
public function handle()
{
$user = $this->user;
Mail::to($user)->send(new RegisterConfirmation($user));
}
When I run this, it returns the following error:
[2021-07-09 20:33:57] local.ERROR: Undefined property:
App\Jobs\RegisterConfirmationJob::$user {"exception":"[object]
(ErrorException(code: 0): Undefined property:
App\Jobs\RegisterConfirmationJob::$user at
/home/vagrant/projects/app/Jobs/RegisterConfirmationJob.php:37)
[stacktrace]
Why is this happening?
EDIT:
As requested, here is my entire RegisterConfirmationJob class:
<?php
namespace App\Jobs;
use App\Mail\RegisterConfirmation;
use App\User;
use Illuminate\Support\Facades\Mail;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldBeUnique;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
class RegisterConfirmationJob implements ShouldQueue
{
use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
public function __construct(User $user)
{
$this->user = $user;
}
public function handle()
{
$user = $this->user;
Mail::to($user)->send(new RegisterConfirmation($user));
}
}

Answer 1

It's simple, you hadn't declared $user as a class property, that is the error meaning.
I recommend you declare it as public property to use it at blade template

Answer 2

Yeah bro, it's not a Laravel problem, it's a PHP class definition problem, you can solve this by declaring the $user property, like that:
<?php
namespace App\Jobs;
use App\Mail\RegisterConfirmation;
use App\User;
use Illuminate\Support\Facades\Mail;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldBeUnique;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Foundation\Bus\Dispatchable;
use Illuminate\Queue\InteractsWithQueue;
use Illuminate\Queue\SerializesModels;
class RegisterConfirmationJob implements ShouldQueue
{
use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
protected $user; // you forgot of put this line
public function __construct(User $user)
{
$this->user = $user;
}
public function handle()
{
$user = $this->user;
Mail::to($user)->send(new RegisterConfirmation($user));
}
}