Show element history on part info page in history tab.

src/Services/EntityURLGenerator.php

@@ -44,6 +44,7 @@ namespace App\Services;
 
 use App\Entity\Attachments\Attachment;
 use App\Entity\Attachments\AttachmentType;
+use App\Entity\Attachments\PartAttachment;
 use App\Entity\Base\AbstractDBElement;
 use App\Entity\Devices\Device;
 use App\Entity\Parts\Category;
@@ -51,9 +52,12 @@ use App\Entity\Parts\Footprint;
 use App\Entity\Parts\Manufacturer;
 use App\Entity\Parts\MeasurementUnit;
 use App\Entity\Parts\Part;
+use App\Entity\Parts\PartLot;
 use App\Entity\Parts\Storelocation;
 use App\Entity\Parts\Supplier;
 use App\Entity\PriceInformations\Currency;
+use App\Entity\PriceInformations\Orderdetail;
+use App\Entity\PriceInformations\Pricedetail;
 use App\Entity\UserSystem\Group;
 use App\Entity\UserSystem\User;
 use App\Exceptions\EntityNotSupportedException;
@@ -120,6 +124,49 @@ class EntityURLGenerator
         throw new InvalidArgumentException('Method is not supported!');
     }
 
+    /**
+     * Gets the URL to view the given element at a given timestamp
+     * @param $entity
+     * @param  \DateTime  $dateTime
+     * @return string
+     */
+    public function timeTravelURL($entity, \DateTime $dateTime): string
+    {
+        if ($entity instanceof Part) {
+            return $this->urlGenerator->generate('part_info', [
+                'id' => $entity->getID(),
+                'timestamp' => $dateTime->getTimestamp()
+            ]);
+        }
+        if ($entity instanceof PartLot) {
+            return $this->urlGenerator->generate('part_info', [
+                'id' => $entity->getPart()->getID(),
+                'timestamp' => $dateTime->getTimestamp()
+            ]);
+        }
+        if ($entity instanceof PartAttachment) {
+            return $this->urlGenerator->generate('part_info', [
+                'id' => $entity->getElement()->getID(),
+                'timestamp' => $dateTime->getTimestamp()
+            ]);
+        }
+        if ($entity instanceof Orderdetail) {
+            return $this->urlGenerator->generate('part_info', [
+                'id' => $entity->getPart()->getID(),
+                'timestamp' => $dateTime->getTimestamp()
+            ]);
+        }
+        if ($entity instanceof Pricedetail) {
+            return $this->urlGenerator->generate('part_info', [
+                'id' => $entity->getOrderdetail()->getPart()->getID(),
+                'timestamp' => $dateTime->getTimestamp()
+            ]);
+        }
+
+        //Otherwise throw an error
+        throw new EntityNotSupportedException('The given entity is not supported yet!');
+    }
+
     public function viewURL($entity): string
     {
         if ($entity instanceof Attachment) {

src/Services/LogSystem/HistoryHelper.php

@@ -0,0 +1,57 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 - 2020 Jan Böhmer (https://github.com/jbtronics)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published
+ * by the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace App\Services\LogSystem;
+
+
+use App\Entity\Base\AbstractDBElement;
+use App\Entity\Parts\Part;
+
+class HistoryHelper
+{
+    public function __construct()
+    {
+
+    }
+
+    /**
+     * Returns an array containing all elements that are associated with the argument.
+     * The returned array contains the given element.
+     * @param  AbstractDBElement  $element
+     * @return array
+     */
+    public function getAssociatedElements(AbstractDBElement $element): array
+    {
+        $array = [$element];
+        if ($element instanceof Part) {
+            $array = array_merge(
+                $array,
+                $element->getAttachments()->toArray(),
+                $element->getPartLots()->toArray(),
+                $element->getOrderdetails()->toArray()
+            );
+            foreach ($element->getOrderdetails() as $orderdetail) {
+                $array = array_merge($array, $orderdetail->getPricedetails()->toArray());
+            }
+        }
+
+        return $array;
+    }
+}