Laravel/Lumen | Failing to dispatch event - php

Question

This is my first time using events in Laravel/Lumen.
I am actually using Lumen and I am trying to dispatch an instance of Mailable when a new user signs up in order to send an email in the background.
I believe I have set it up right, but I keep getting this error...
Type error: Argument 1 passed to Illuminate\Mail\Mailable::queue() must implement interface Illuminate\Contracts\Queue\Factory, instance of Illuminate\Queue\DatabaseQueue given
I can't actually see within the error message itself where the issue is coming from e.g. there is no line numbers.
However, this is my code...
AuthenticationContoller.php
$this->dispatch(new NewUser($user));
NewUser.php
<?php
namespace App\Mail;
use App\Models\User;
use Illuminate\Mail\Mailable;
use Illuminate\Bus\Queueable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;
class NewUser extends Mailable implements ShouldQueue
{
use Queueable, SerializesModels;
protected $user;
public function __construct(User $user)
{
$this->user = $user;
}
/**
* Build the message.
*
* #return $this
*/
public function build()
{
return $this->view('test')->to('test#test.com', 'Test')
->from('test#test.com', 'test')->replyTo('test#test.com', 'test')
->subject('Welcome to the blog!');
}
}

Answer 1

I ran into the same issue. It seems like Lumen and Illuminate/Mailer don't work together all that well.
However I found quite an easy fix in a Github thread.
Basically you just have to create a new service provider in your app/Providers directory.
MailServiceprovider.php
<?php
namespace App\Providers;
use Illuminate\Mail\Mailer;
use Illuminate\Mail\MailServiceProvider as BaseProvider;
class MailServiceProvider extends BaseProvider
{
/**
* Register the Illuminate mailer instance.
*
* #return void
*/
protected function registerIlluminateMailer()
{
$this->app->singleton('mailer', function ($app) {
$config = $app->make('config')->get('mail');
// Once we have create the mailer instance, we will set a container instance
// on the mailer. This allows us to resolve mailer classes via containers
// for maximum testability on said classes instead of passing Closures.
$mailer = new Mailer(
$app['view'], $app['swift.mailer'], $app['events']
);
// The trick
$mailer->setQueue($app['queue']);
// Next we will set all of the global addresses on this mailer, which allows
// for easy unification of all "from" addresses as well as easy debugging
// of sent messages since they get be sent into a single email address.
foreach (['from', 'reply_to', 'to'] as $type) {
$this->setGlobalAddress($mailer, $config, $type);
}
return $mailer;
});
$this->app->configure('mail');
$this->app->alias('mailer', \Illuminate\Contracts\Mail\Mailer::class);
}
}
And then you just have to register this service provider in your bootstrap/app.php instead of the default one by adding the following line:
$app->register(\App\Providers\MailServiceProvider::class);