Using Bundle Configuration

In our bundle, we've defined and validated the translation_class configuration option. In our app, we've configured it as App\Entity\Translation. Now, we need to use it in our bundle's ObjectTranslator service.

ObjectTranslator Update

Open this class up, and add it to the constructor as private string $translationClass.

Hope over to the browser and click an article. An error: "Too few arguments to ... ObjectTranslator::__construct(), 2 passed... 3 expected".

abstract_arg()

Let's fix this. Open our bundle's config/services.php. We need to add it as a third element in this args() array. But... we don't have access to our configuration here. For now, we can stub it out with a special function: abstract_arg(). For the first argument, describe its purpose: "Translation class".

This isn't strictly required, but it helps with debugging. We're basically letting Symfony know that we need to configure this argument still.

Back in the browser, refresh. A new error: "Argument 3 of service ...object_translator is abstract". And we see our description: "Translation class". Perfect!

Using Bundle Configuration

Now... we need to find the place where we have access to the bundle configuration.

In ObjectTranslationBundle::loadExtension(), notice the array $config argument. Inside this method, dump it with: dd($config). Back in the browser, refresh.

Nice! Here's our processed configuration as an array! Time to put it to use!

Below the import, write $builder->getDefinition(). Be sure to use getDefinition(), not get(). Inside, pass the service ID for our ObjectTranslator service: symfonycasts.object_translator.

One of the bonuses of working on your bundle within an app is that you can get PhpStorm + Symfony Plugin auto-completion for your services.

Next, chain ->setArgument(). The first argument here is the 0-based index of the constructor argument we want to set. Quickly jump to ObjectTranslator, $translationClass is the third argument, so we need to pass 2.

The second argument is the value we want to set: $config['translation_class'].

Jump back to your browser and refresh. Nice! No errors.

Let's make sure this was given the value we expect. Open ArticleController::show() and dd($translator).

Back in the browser... refresh. Sweet! Here's our ObjectTranslator object and indeed, the translationClass property is set to App\Entity\Translation.

Remove the dd(), refresh, and we're ready to move on!

Next, let's start writing our translation logic in ObjectTranslator.