Dependency injection in create() method of block plugin with derivatives

I am trying to extend the menu_block module to allow it to work with domains (via the domain module). In order to do this I am extending the MenuBlock class, and trying to access the domain.negotiator service from within getDerivativeID(). I am using the create() method to inject the service and store it to a $domainNegotiator property as follows:

  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {     $instance = parent::create($container, $configuration, $plugin_id, $plugin_definition);     $instance->domainNegotiator = $container->get('domain.negotiator');     return $instance;   } 

When I attempt to call $this->domainNegotiator from within getDerivativeID() I get an error stating the property doesn’t exist and I therefore cannot access methods on it. In debugging I was able to trace the issue to MenuBlock::defaultConfiguration() calling $this->getDerivativeID().

Default configuration is set in __construct() inside BlockPluginTrait (called in BlockBase), so ultimately it boils up to being called in my class’s create() method.

I am able to work around this issue by using a non-injected version of the service in my getDerivativeID() method, however this isn’t a great practice:

$active_domain = Drupal::service('domain.negotiator')->getActiveDomain(); 

Is there a way to inject dependencies so they are available before calling parent::create() in my class’s create() method?

This article was republished from its original source.
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Dependency injection in create() method of block plugin with derivatives

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