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Configuration Loading and Type-Hinting

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Configuration Loading and Type-Hinting

So just like with routing files, services.yml isn’t magically loaded by Symfony: something needs to import it.

When the bundle was generated, an EventExtension class was created for you.

This class is mostly useful for third-party bundles, but one thing it does by default is load the services.yml file:

// src/Yoda/EventBundle/DependencyInjection/EventExtension.php
// ...

public function load(array $configs, ContainerBuilder $container)
    // ...
    // this was all generated when we generated the bundle

If you don’t have this “Extension” class in your bundle, no problem! In fact, delete the entire DependencyInjection directory. Now, just import your services.yml file from inside config.yml:

# app/config/config.yml
    # ...
    - { resource: "@EventBundle/Resources/config/services.yml" }

You could also rename services.yml to anything else. As you can see, the name isn’t important.


The point is that any file that defines a service must be imported manually. This can be done via the special “extension” class of a bundle or simply by adding it to the imports section of config.yml or any other configuration file.

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There’s one more thing in our service that’s bothering me. The first argument to the constructor is the entity manager object, but we’re not type-hinting it. Type-hinting is optional, but I like doing it because it gives me better errors and gives me auto-completion in PhpStorm.

So what is the class for the entity manager service? One way to find out is to use container:debug but pass it the service name:

php app/console container:debug doctrine.orm.entity_manager

It says that it’s just an “alias” for a different service. So let’s look up that one:

php app/console container:debug doctrine.orm.default_entity_manager

Great! Now we can add a type-hint for the argument. And by the way, a lot of times I just guess the class name and let PhpStorm mind trick ... I mean auto-complete the use statement for me. It’s lazy, but it almost always works:

// src/Yoda/EventBundle/Reporting/EventReportManager.php
// ...

use Doctrine\ORM\EntityManager;

class EventReportManager
    private $em;

    public function __construct(EntityManager $em)
        $this->em = $em;

If you’re not too comfortable with this, don’t worry. This is optional, but a good practice to get into.