How to get Custom Entity associated fields in Subscriber? 'Mapping definition neither have entities nor collection' error

Question

I'm going to use Custom Entity associated fields in Subscriber. But I get this error: Mapping definition neither have entities nor collection.

Subscriber.php:

class Subscriber implements EventSubscriberInterface
{
    private EntityRepository $myfilter_property_group_option_tagRepository;

    public function __construct(EntityRepository $myfilter_property_group_option_tagRepository)
    {
        $this->myfilter_property_group_option_tagRepository = $myfilter_property_group_option_tagRepository;
    }

    public static function getSubscribedEvents(): array
    {
        return [
            ProductListingCriteriaEvent::class => [
                ['onListingCriteria', -200],
            ],
        ];
    }

    public function onListingCriteria(ProductListingCriteriaEvent $event): void
    {
        $context = $event->getContext();
        $optiontags = $this->myfilter_property_group_option_tagRepository->search(new Criteria(), $context);
        $event->getContext()->addExtension('optionTags', new ArrayEntity($optiontags));
        
        // Further 
        $event->getCriteria()->addAssociation('properties');
        $event->getCriteria()->addAssociation('properties.group');

        $criteria = $event->getCriteria();
        $filters = $criteria->getExtension('filters');

        if (!$filters instanceof FilterCollection) {
            return;
        }

        $propertyFilter = $filters->get('properties');
        // More

services.xml:

<service id="MyFilter\Subscriber\Subscriber">
    <tag name="kernel.event_subscriber"/>
    <argument type="service" id="myfilter_property_group_option_tag.repository"/>
</service>

Does someone know, what I'm doing wrong?

Also there is already an extension for this entity created in administration component. Is it possible to use that one?

Answer 1

myfilter_property_group_option_tag is based on a mapping definition, presumably mapping property_group_option and tag entities. Mappings themselves can't be fetched. Fetch the entities on either side of the mapping instead.

$criteria = new Criteria();
$criteria->addAssociation('myTags');

$tags = new TagCollection();
$options = $this->optionRepository->search($criteria, $context->getContext())->getEntities();
/** @var PropertyGroupOptionEntity $option */
foreach ($options as $option) {
    $extension = $option->getExtension('myTags');
    
    if (!$extension instanceof TagCollection) {
        continue;
    }
    
    $tags->merge($extension);
}