Add original date to dates if available

This is not possible via native API.
We therefore use the event to fetch and add the relation.

Relates: #8857

Classes/Domain/Model/Date.php

@@ -26,10 +26,15 @@ class Date extends AbstractEntity
     protected $canceled = "no";
 
     /**
-     * @var Date
+     * @var null|Date
      */
     protected $postponedDate;
 
+    /**
+     * @var null|Date
+     */
+    protected $originalDate;
+
     /**
      * @var \Wrm\Events\Domain\Model\Event
      */
@@ -141,6 +146,11 @@ class Date extends AbstractEntity
         return null;
     }
 
+    public function getOriginalDate(): ?Date
+    {
+        return $this->originalDate;
+    }
+
     public function getCanceledLink(): string
     {
         if ($this->getCanceled() === 'canceled') {

Classes/Extbase/AddSpecialProperties.php

@@ -0,0 +1,75 @@
+<?php
+
+namespace Wrm\Events\Extbase;
+
+/*
+ * Copyright (C) 2021 Daniel Siepmann <coding@daniel-siepmann.de>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+use TYPO3\CMS\Core\Database\ConnectionPool;
+use TYPO3\CMS\Extbase\Event\Persistence\AfterObjectThawedEvent;
+use TYPO3\CMS\Extbase\Persistence\Generic\Mapper\DataMapper;
+use Wrm\Events\Domain\Model\Date;
+
+class AddSpecialProperties
+{
+    /**
+     * @var ConnectionPool
+     */
+    private $connectionPool;
+
+    /**
+     * @var DataMapper
+     */
+    private $dataMapper;
+
+    public function __construct(
+        ConnectionPool $connectionPool,
+        DataMapper $dataMapper
+    ) {
+        $this->connectionPool = $connectionPool;
+        $this->dataMapper = $dataMapper;
+    }
+
+    public function __invoke(AfterObjectThawedEvent $event): void
+    {
+        if ($event->getObject() instanceof Date) {
+            /** @var Date $date */
+            $date = $event->getObject();
+            $date->_setProperty('originalDate', $this->getOriginalDate($date->_getProperty('_localizedUid')));
+        }
+    }
+
+    private function getOriginalDate(int $uidOfReferencedDate): ?Date
+    {
+        $qb = $this->connectionPool->getQueryBuilderForTable('tx_events_domain_model_date');
+        $qb->select('*');
+        $qb->from('tx_events_domain_model_date');
+        $qb->where($qb->expr()->eq('postponed_date', $uidOfReferencedDate));
+        $qb->setMaxResults(1);
+
+        $result = $qb->execute()->fetch();
+
+        if ($result === false) {
+            return null;
+        }
+
+        $dates = $this->dataMapper->map(Date::class, [$result]);
+        return $dates[0] ?? null;
+    }
+}

Configuration/Services.yaml

@@ -21,3 +21,9 @@ services:
     tags:
       - name: 'console.command'
         command: 'events:removePast'
+
+  Wrm\Events\Extbase\AddSpecialProperties:
+    tags:
+      - name: event.listener
+        identifier: 'WrmEventsAddSpecialPropertiesToDate'
+        event: TYPO3\CMS\Extbase\Event\Persistence\AfterObjectThawedEvent