Use constructor in Symfony2 controller

Question

I'd like to use a constructor in my Symfony2 controller, but I have this error:

ContextErrorException: Catchable Fatal Error: Argument 1 passed to Acme\ApplicationBundle\Controller\CalendarActivityController::__construct() must implement interface Symfony\Component\DependencyInjection\ContainerInterface, none given, called in /Users/root/Documents/projects/Acme/Symfony/app/cache/dev/classes.php on line 2374 and defined in /Users/root/Documents/projects/Test/Symfony/src/Acme/ApplicationBundle/Controller/CalendarActivityController.php line 16

My constructor:

public function __construct(Container $container) {
    $this->container = $container;
}

I must use a constructor because sometimes I'm using my controller as a service, and in this case container is not defined.

His solution got rid of the error message but you will still have problems the first time you try to use the container. It's not available in the constructor. You need to use setter injection to inject the container. More than likely you really want to use a listener instead of a controller. Plenty of threads on this. — Cerad
– Cerad, Commented Mar 21, 2014 at 16:59
After reading through the responses my suggestion is hacky… consider the other answers as better advice. — Mark Fox
– Mark Fox, Commented Mar 21, 2014 at 21:02

Jakub Zalas · Accepted Answer · 2014-03-21 17:55:14Z

1

It is possible to inject services into your controller if your controller is registered as a service itself. Read more about it in the official docs: http://symfony.com/doc/current/cookbook/controller/service.html

However, let me point out, that there's not much value in injecting the Container. It's much easier to extend the Symfony\Component\DependencyInjection\ContainerAware. Symfony will inject the container for you automatically (since ContainerAware implements the ContainerAwareInterface).

Register your controller as a service if you want to inject specific services.

Use ContainerAware otherwise.

answered Mar 21, 2014 at 17:55

Jakub Zalas

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2 Comments

Cerad Over a year ago

Are you sure about the automatic container injection? I tried it once but no luck. I just spell out the setter injection in the services file. Maybe a tag is needed?

Jakub Zalas Over a year ago

@Cerad, yes Symfony will inject container into your controller if you make it ContainerAware (implement the interface or extend the ContainerAware class). This is how it works by default in Symfony, also with automatically generated controllers.

Suresh Kumar Amrani · Accepted Answer · 2014-03-21 18:02:34Z

0

you have to call container from dependncy injection use USE

    use Symfony\Component\DependencyInjection\ContainerInterface as Container;
      private $container;

public function __construct(Container $container) {
        $this->container = $container;

    }

answered Mar 21, 2014 at 18:02

Suresh Kumar Amrani

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