Symfony 4 Accessing Swift_Mailer in Service - symfony

Question

I have been looking at the Symfony 4.1 documentation on using the Swift_mailer. However, it appears the documentation is only assumed it being used in the Controller classes. I'm trying to create a Service with some reusable functions that send email.
I created a EmailService.php file in my service directory. When creating a new instance of this service, it quickly throws and error:
"Too few arguments to function
App\Service\EmailService::__construct(), 0 passed in
*MyApp\src\Controller\TestController.php on line 33
and exactly 1 expected"
I'm not sure how to pass \Swift_Mailer $mailer into the __construct correctly? I have auto wiring enabled in the services.yaml, so i'm not sure what I need to do differently?
class EmailService
{
private $from = 'support#******.com';
private $mailer;
public function __construct(\Swift_Mailer $mailer)
{
$this->mailer = $mailer;
}
How do I pass the \Swift_Mailer into this EmailService construct?
I tried adding this to my config\services.yaml with no success:
App\Service\EmailService:
arguments: ['#mailer']

Answer 1

As mentioned by dbrumann in a comment, I needed to follow the proper way of injecting services.
First, I needed to add the services to config/services.yaml
#config/services.yaml
emailservice:
class: App\Service\EmailService
arguments: ['#swiftmailer.mailer.default', '#twig']
public: true
Second, I need to setup the service to accept both the mailer, and twig for rendering the template.
#App/Service/EmailService.php
<?php
namespace App\Service;
class EmailService
{
private $from = 'support#*****.com';
private $mailer;
private $templating;
public function __construct(\Swift_Mailer $mailer, \Twig\Environment $templating)
{
$this->mailer = $mailer;
$this->templating = $templating;
}
public function userConfirmation(string $recipient, string $confCode) : bool
{
$message = (new \Swift_Message())
->setSubject('Some sort of string')
->setFrom($this->from)
->setTo($recipient)
->setBody(
$this->templating->render(
'email/UserConfirmation.html.twig',
array('confCode' => $confCode)
),
'text/html'
)
/*
* If you also want to include a plaintext version of the message
->addPart(
$this->renderView(
'emails/UserConfirmation.txt.twig',
array('confCode' => $confCode)
),
'text/plain'
)
*/
;
return $this->mailer->send($message);
}
}
Third, to call it from the controller, make sure your controller is extending Controller and not the AbstractController! Crucial step!! Here is an example based on the parameters I require in my service:
public function userConfirmation()
{
$emailService = $this->get('emailservice');
$sent = $emailService->userConfirmation('some#emailaddress.com', '2ndParam');
return new Response('Success') //Or whatever you want to return
}
I hope this helps people. AbstractController does not give you the proper access to the service containers.

Answer 2

#config/services.yaml
App\Service\EmailService
arguments: ['#swiftmailer.mailer.default']
public: true
And in your controller :
public function userConfirmation(EmailService $emailService)
{
$sent = $emailService->userConfirmation('some#emailaddress.com', '2ndParam');
return new Response('Success') //Or whatever you want to return
}
Use FQCN "App\Service\MyService" to declare services in services.yaml and a proper legacy_aliases.yaml file to declare legacy aliases like "app.service.my.service" it helps keep your services.yaml clean...