performance tuning on timesheets (#874)

src/Repository/Loader/TimesheetLoader.php

@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Repository\Loader;
+
+use App\Entity\Timesheet;
+use Doctrine\ORM\EntityManagerInterface;
+
+final class TimesheetLoader implements LoaderInterface
+{
+    /**
+     * @var TimesheetIdLoader
+     */
+    private $loader;
+
+    public function __construct(EntityManagerInterface $entityManager)
+    {
+        $this->loader = new TimesheetIdLoader($entityManager);
+    }
+
+    /**
+     * @param Timesheet[] $timesheets
+     */
+    public function loadResults(array $timesheets): void
+    {
+        $ids = array_map(function (Timesheet $timesheet) {
+            return $timesheet->getId();
+        }, $timesheets);
+
+        $this->loader->loadResults($ids);
+    }
+}