Cache the trees structures for treeViews used in the sidebar.

src/Repository/NamedDBElementRepository.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ * Copyright (C) 2019 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 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
+ */
+
+namespace App\Repository;
+
+
+use App\Entity\Base\NamedDBElement;
+use App\Entity\Base\StructuralDBElement;
+use App\Helpers\TreeViewNode;
+use Doctrine\ORM\EntityRepository;
+use Doctrine\ORM\Mapping\Entity;
+
+
+class NamedDBElementRepository extends EntityRepository
+{
+    /**
+     * Gets a tree of TreeViewNode elements. The root elements has $parent as parent.
+     * The treeview is generic, that means the href are null and ID values are set.
+     * @return TreeViewNode[]
+     */
+    public function getGenericNodeTree() : array
+    {
+        $result = [];
+
+        $entities = $this->findAll();
+        foreach ($entities as $entity) {
+            /** @var $entity NamedDBElement */
+            $node = new TreeViewNode($entity->getName(), null, null);
+            $node->setId($entity->getID());
+            $result[] = $node;
+        }
+
+        return $result;
+    }
+}