Dependency Injenction in config.yml - symfony

Question

I have two services and I want pass my parameter from config.yml
my config.yml
parameters:
MyService.class: Acme\UserBundle\Services\sendEmail
MyService.arguments: #mailer
NewUserListener.class: Acme\UserBundle\Event\NewUserListener
NewUserListener.arguments: #MyService
my service.yml inside bundle
services:
MyService:
class: %MyService.class%
arguments: [%MyService.arguments%]
NewUserListener:
class: %NewUserListener.class%
arguments: [%NewUserListener.arguments%]
tags:
- { name: kernel.event_listener, event: new.user, method: sendEmailToUsers }
I got an error
You cannot dump a container with parameters that contain references to
other services
My Questions are:
How can I inject my arguments from config.yml?
Where can i Find the list of "global service" like #mailer ? i don't find in doc

Answer 1

You can't reference a service in a parameter. You should replace %MyService.arguments% with #mailer.
To find all available services, run php app/console container:debug

Answer 2

This a bit more complicated!
First, you have to declare your default services like that (I changed all the names in order to be compliant with the Symfony2's conventions):
# resources/config/services.yml
services:
my_own.service.default.class: Acme\UserBundle\Services\sendEmail
my_own.user_listener.default.class: Acme\UserBundle\Event\NewUserListener
services:
my_own.service.default:
class: %my_own.service.default.class%
arguments: [#mailer]
my_own.user_listener:
class: %my_own.user_listener.class%
arguments: [#my_own.service]
tags:
- { name: kernel.event_listener, event: new.user, method: sendEmailToUsers }
We will define some configuration for your bundle in order to allow to change the used services:
namespace My\OwnBundle\DependencyInjection;
use Symfony\Component\Config\Definition\Builder\TreeBuilder;
use Symfony\Component\Config\Definition\ConfigurationInterface;
/**
* This is the class that validates and merges configuration from your app/config files
*
* To learn more see {#link http://symfony.com/doc/current/cookbook/bundles/extension.html#cookbook-bundles-extension-config-class}
*/
class Configuration implements ConfigurationInterface
{
/**
* {#inheritDoc}
*/
public function getConfigTreeBuilder()
{
$treeBuilder = new TreeBuilder();
$rootNode = $treeBuilder->root('my_own');
// Here you should define the parameters that are allowed to
// configure your bundle. See the documentation linked above for
// more information on that topic.
$rootNode
->children()
->scalarNode('service')->defaultValue('my_own.service.default')->end()
->scalarNode('user_listener')->defaultValue('my_own.user_listener.default')->end()
->end();
return $treeBuilder;
}
}
Note that, by default, we use our default services defined above in our bundle.
You now can use the following to change your services (in your app/config.yml) for instance:
# app/config.yml
my_own:
service: my_other.service
user_listener: my_other.user_listener
Of course, you can define the services my_other.service and my_other.user_listener as you want in your bundle or in another bundle.
Now we have to tell how to use this configuration to take the wanted services:
namespace My\OwnBundle\DependencyInjection;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\Config\FileLocator;
use Symfony\Component\HttpKernel\DependencyInjection\Extension;
use Symfony\Component\DependencyInjection\Loader;
/**
* This is the class that loads and manages your bundle configuration
*
* To learn more see {#link http://symfony.com/doc/current/cookbook/bundles/extension.html}
*/
class MyOwnExtension extends Extension
{
/**
* {#inheritDoc}
*/
public function load(array $configs, ContainerBuilder $container)
{
$configuration = new Configuration();
$config = $this->processConfiguration($configuration, $configs);
$loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
$loader->load('services.yml');
$container->setAlias('my_own.service', $config['service']);
$container->setAlias('my_own.user_listener', $config['user_listener']);
}
}
Finally, in the rest of your code you have to use the aliased services my_own.service and my_own.user_listener in your code:
// In one of your controller:
$this->container->get('my_own.service');
/* or directly */ $this->get('my_own.service'); // if your controller is a child of the framework bundle class `Controller`.