Moved getParts() and getPartsCount() to a repository (instead of a class method).

src/Repository/AbstractPartsContainingRepository.php

@@ -0,0 +1,70 @@
+<?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\Repository;
+
+
+use App\Entity\Base\AbstractPartsContainingDBElement;
+use App\Entity\Base\PartsContainingRepositoryInterface;
+use App\Entity\Parts\Part;
+use Doctrine\Common\Collections\Collection;
+use Doctrine\Common\Collections\Criteria;
+
+abstract class AbstractPartsContainingRepository extends StructuralDBElementRepository
+    implements PartsContainingRepositoryInterface
+{
+    /**
+     * Returns all parts associated with this element.
+     * @param  AbstractPartsContainingDBElement $element The element for which the parts should be determined.
+     * @param  array  $order_by The order of the parts. Format ['name' => 'ASC']
+     * @return Part[]
+     */
+    abstract public function getParts(object $element, array $order_by = ['name' => 'ASC']): array;
+
+    /**
+     * Gets the count of the parts associated with this element.
+     * @param AbstractPartsContainingDBElement $element The element for which the parts should be determined.
+     * @return int
+     */
+    abstract public function getPartsCount(object $element): int;
+
+    protected function getPartsByField(object $element, array $order_by, string $field_name): array
+    {
+        if (!$element instanceof AbstractPartsContainingDBElement) {
+            throw new \InvalidArgumentException('$element must be an instance of AbstractPartContainingDBElement!');
+        }
+
+        $repo = $this->getEntityManager()->getRepository(Part::class);
+
+        return $repo->findBy([$field_name => $element], $order_by);
+    }
+
+    protected function getPartsCountByField(object $element, string $field_name): int
+    {
+        if (!$element instanceof AbstractPartsContainingDBElement) {
+            throw new \InvalidArgumentException('$element must be an instance of AbstractPartContainingDBElement!');
+        }
+
+        $repo = $this->getEntityManager()->getRepository(Part::class);
+
+        return $repo->count([$field_name => $element]);
+    }
+
+}