UpdateRiverLastActionHandler.php

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<?php

namespace Elgg\Comments;

class UpdateRiverLastActionHandler {
    
    public function __invoke(\Elgg\Event $event) {
        $item = $event->getObject();
        if (!$item instanceof \ElggRiverItem) {
            return;
        }
        
        $object = $item->getObjectEntity();
        if (!$object instanceof \ElggComment || $item->action_type !== 'comment') {
            return;
        }
        
        // find create river and update the river item
        $river = elgg_get_river([
            'object_guid' => $item->target_guid,
            'action' => 'create',
            'limit' => 1,
        ]);
        if (empty($river)) {
            return;
        }
        
        $old_item = $river[0];
        $old_item->updateLastAction($item->getTimePosted());
    }
}