Service Method Calls and Setter Injection
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Service Method Calls and Setter Injection
Tip
If you're using autowiring, you can use @required to
automatically configure method calls.
Usually, you'll want to inject your dependencies via the constructor. But sometimes, especially if a dependency is optional, you may want to use "setter injection". For example:
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namespace AppBundle\Service;
use Psr\Log\LoggerInterface;
class MessageGenerator
{
private $logger;
public function setLogger(LoggerInterface $logger)
{
$this->logger = $logger;
}
// ...
}To configure the container to call the setLogger method, use the calls key:
- YAML
- XML
- PHP
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# app/config/services.yml
services:
AppBundle\Service\MessageGenerator:
# ...
calls:
- method: setLogger
arguments:
- '@logger'
