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[DependencyInjection] Autoconfigurable attributes #17933

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Feb 24, 2023
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[DependencyInjection] Autoconfigurable attributes #17933

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48 changes: 48 additions & 0 deletions service_container/tags.rst
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Expand Up @@ -175,6 +175,54 @@ In a Symfony bundle, call this method in the ``load()`` method of the
}
}

Autoconfiguration registering is not limited to interfaces. It is possible
to use PHP 8 attributes to autoconfigure services by using the
:method:`Symfony\\Component\\DependencyInjection\\ContainerBuilder::registerAttributeForAutoconfiguration`
method::

// src/Attribute/SensitiveElement.php
namespace App\Attribute;

#[\Attribute(\Attribute::TARGET_CLASS)]
class SensitiveElement
{
private string $token;

public function __construct(string $token)
{
$this->token = $token;
}

public function getToken(): string
{
return $this->token;
}
}

// src/Kernel.php
use App\Attribute\SensitiveElement;

class Kernel extends BaseKernel
{
// ...

protected function build(ContainerBuilder $containerBuilder): void
{
// ...

$containerBuilder->registerAttributeForAutoconfiguration(SensitiveElement::class, static function (ChildDefinition $definition, SensitiveElement $attribute, \ReflectionClass $reflector): void {
// Apply the 'app.sensitive_element' tag to all classes with SensitiveElement
// attribute, and attach the token value to the tag
$definition->addTag('app.sensitive_element', ['token' => $attribute->getToken()]);
});
}
}

.. versionadded:: 5.3

The :method:`Symfony\\Component\\DependencyInjection\\ContainerBuilder::registerAttributeForAutoconfiguration`
method was introduced in Symfony 5.3.

Creating custom Tags
--------------------

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