How to give a fixed Uid to my Action - typo3

Question

Hy,
I'm trying to call my action with allways a fixed Uid (configured by TS) so I could put a plugin on my page to register for a specific Event. And don't have to go over a Event List click the Event click register.
I tried the following which did not work out:
public function newAction(
\XYZ\xyz\Domain\Model\Registration $newRegistration = NULL,
\XYZ\xyz\Domain\Model\Event $event = 'DD8B2164290B40DA240D843095A29904'
)
The next didn't one work either!
public function newAction(
\XYZ\xyz\Domain\Model\Registration $newRegistration = NULL,
\XYZ\xyz\Domain\Model\Event $event = Null
) {
$myinstance = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
'XYZ\\xyz\\Domain\\Model\\Event'
);
$event = $myinstance->findByUid('DD8B2164290B40DA240D843095A29904');
.......
}
So I was woundering is there a way to give my fixed Uid to the action?

Answer 1

In TYPO3 calling Extbase actions is done in the routing and dispatching components - to pass anything from the outside that is different from a numeric uid value a custom property TypeConverter would have to be implemented that transforms a particular string pattern into a value domain object of type Event.
However, there's a simpler approach by using configuration:
1) Provide configuration in TypoScript
Extbase uses a strong naming convention based on the extension name and optionally the plugin name. Thus, either tx_myextension or tx_myextension_someplugin can be used - latter is more specific for for according somePlugin. Besides that settings are automatically forwarded and provided in an Extbase controller context - accessible by $this->settings.
plugin.tx_xyz {
settings {
newActionEventIdentifier = DD8B2164290B40DA240D843095A29904
}
}
2) Retrieve data via repository
\XYZ\xyz\Domain\Repository\EventRepository
Use a dedicated EventRepository::findByIdentifier(string) method to retrieve the data. The property names are just assumptions since there are no explicit mentions how exactly the event data is persisted and whether it is persisted in a relational DBMS at all.
<?php
namespace XYZ\xyz\Domain\Repository;
class EventRepository
{
public function findByIdentifier($identifier)
{
$query = $this->createQuery();
$query->matching(
$query->equals('event_id', $identifier)
);
return $query->execute();
}
}
3) Putting all together in the according controller
The $event property was removed from the action since that entity is pre-defined and cannot be submitted from the outside (and to support the string to Event entity transformation a custom TypeConverter would be required as mentioned earlier).
public function newAction(
\XYZ\xyz\Domain\Model\Registration $newRegistration = null
) {
$event = $this->eventRepository->findByIdentifier(
$this->settings['newActionEventIdentifier']
);
if ($event === null) {
throw new \RuntimeException('No event found', 1522070079);
}
// the regular controller tasks
$this->view->assign(...);
}