Symfony2 accessing mailer service - php

Question

I am working with Symfony2 and am trying to access mailer service but constantly get this error message:
{"errors":{"code":500,"message":"Error: Call to a member function get() on a non-object"}}
my code:
<?php
namespace TestBundle\UserBundle\Utilities;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
class EmailServiceClass extends Controller
{
public function sendEmail($subject, $to, $body)
{
$msg = \Swift_Message::newInstance();
$msg->setSubject($subject);
$msg->setTo($to);
$msg->setBody($body);
$msg->setContentType('text/html');
$msg->setCharset('utf-8');
$msg->setFrom('test#gmail.com');
$this->get('mailer')->send($msg);
}
}
The error comes from this line: $this->get('mailer')->send($msg);
From what I understand when I extend Controller calls I should be able to access this service without having to specifically create a service.

Answer 1

You should do it another way.
It's the best when your services are POPO (Plain Old PHP Object). Also dependencies should be passed via constructor, so let's refactor your service a little bit:
class EmailServiceClass //no need to extend anything
{
private $mailerService; //dependency as private property
//we're passing dependencies via constructor
public function __construct(\Swift_Mailer $mailerService)
{
$this->mailerService = $mailerService;
}
public function sendEmail($subject, $to, $body)
{
$msg = \Swift_Message::newInstance();
$msg->setSubject($subject);
$msg->setTo($to);
$msg->setBody($body);
$msg->setContentType('text/html');
$msg->setCharset('utf-8');
$msg->setFrom('test#gmail.com');
//now you can access mailer service like that
$this->mailerService->send($msg);
}
}
Now of course you need to modify the way you configure this service in Service Container.
You probably have something like this now:
services:
your_mailer:
class: TestBundle\UserBundle\Utilities\EmailServiceClass
Now you need to add arguments line in order to pass dependencies:
services:
your_mailer:
class: TestBundle\UserBundle\Utilities\EmailServiceClass
arguments: ['#mailer']
The last line defines arguments that will be passed to your service's constructor. mailer is the name of Swift_Mailer service.
More details about how to manage service dependencies can be found in Symfony's Book

Answer 2

Please don't extend the Controller class with a service class. You should inject the dependencies that you require using the services.yml. Please implement your service to be something along the lines of:
MyController.php:
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
class MyController extends Controller
{
public function sendEmailAction()
{
$subject = //..
$to = //..
$body = //..
$this->get('email_service.class')->sendEmail($subject, $to, $body);
// Return a template, or redirect here..
return new Response();
}
}
EmailServiceClass.php
class EmailServiceClass
{
private $mailer;
public function __construct(\Swift_Mailer $mailer)
{
$this->mailer = $mailer;
}
public function sendEmail($subject, $to, $body)
{
$msg = \Swift_Message::newInstance();
$msg->setSubject($subject);
$msg->setTo($to);
$msg->setBody($body);
$msg->setContentType('text/html');
$msg->setCharset('utf-8');
$msg->setFrom('test#gmail.com');
$this->mailer->send($msg);
}
}
app/config/services.yml
email_service.class:
class: TestBundle\UserBundle\Utilities\EmailServiceClass
arguments: ['#mailer']