Added a basic possibility to create/edit/delete specifications for parts.

src/Entity/Base/SpecificationsTrait.php

@@ -0,0 +1,54 @@
+<?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\Entity\Base;
+
+
+use App\Entity\Specifications\Specification;
+use Symfony\Component\Validator\Constraints as Assert;
+
+trait SpecificationsTrait
+{
+    /**
+     * @var Specification[]
+     * @ORM\Column(type="json_document")
+     * @Assert\Valid()
+     */
+    protected $specifications = [];
+
+    /**
+     * Return all associated specifications
+     * @return Specification[]
+     */
+    public function getSpecifications(): array
+    {
+        return $this->specifications ?? [];
+    }
+
+    /**
+     * @param  array  $specifications
+     * @return $this
+     */
+    public function setSpecifications(array $specifications): self
+    {
+        $this->specifications = $specifications;
+        return $this;
+    }
+}