symfony2 configure service with data from another service

Question

Is it possible in Symfony2 to configure a service by injecting data from another service? For example, by calling a getter on another service?

In my specific case I am creating a (reusable) service that can handle translatable entity fields. For this I need a list of available locales in the application. I have looked at some other bundles that also work with locales, but they always use a static array from the configuration. For example:

a2lix_translation_form:
    locales: [en, fr, nl]

This configuration usually ends up mapping to the service in the form of a constructor parameter or setter via the bundle configuration. For example:

class SomeService {
    function __construct(array $locales) { ... }
    // or
    function setLocales(array $locales) { ... }
}

But in my case the list of available locales is not always static and often comes from the database. I have created a Locale service in my application with a method getLocales that returns an array. But how do I get that array into my service that needs it?

The service I am creating that needs a list of locales is split off into a separate reusable bundle. I don't want to inject the Locale service directly because that service is specific to the application, and not the bundle I am creating. I want users of my bundle to be able to provide a static list of locales, or point towards a service that has all the locales.

dbrumann · Accepted Answer · 2013-05-13 15:38:31Z

I would solve this problem using semantic configuration and config defintions. It works pretty similar to how FOSUserBundle asks for a driver and uses different settings depending on your choice (orm, mongodb, propel).

You could add something like this to your config.yml:

a2lix_locale:
    provider: default # database
    # ... additional settings which are optional,
    # but required by provider, e.g. database settings

Your bundle's Configuration.php would verify that a valid provider was selected and that additional settings are set according to what each provider requires. Again, FOSUserBundle provides a great example for how to do this.

Additionally in your bundle's MyBundleExtension.php in /DependencyInjection you can access the service container and pass for instance the parameter locale to your default service in order for it to use the application's default locale provided in parameters.yml.

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