Use new UniqueObjectCollection constraint to ensure that BOM entries does not contain duplicate items

src/Validator/Constraints/UniqueObjectCollection.php

@@ -0,0 +1,62 @@
+<?php
+/*
+ * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
+ *
+ *  Copyright (C) 2019 - 2023 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\Validator\Constraints;
+
+use InvalidArgumentException;
+use Symfony\Component\Validator\Constraint;
+
+#[\Attribute(\Attribute::TARGET_PROPERTY | \Attribute::TARGET_METHOD | \Attribute::IS_REPEATABLE)]
+class UniqueObjectCollection extends Constraint
+{
+    public const IS_NOT_UNIQUE = '7911c98d-b845-4da0-94b7-a8dac36bc55a';
+
+    public array|string $fields = [];
+
+    protected const ERROR_NAMES = [
+        self::IS_NOT_UNIQUE => 'IS_NOT_UNIQUE',
+    ];
+
+    public string $message = 'This collection should contain only unique elements.';
+    public $normalizer;
+
+    /**
+     * @param array|string $fields the combination of fields that must contain unique values or a set of options
+     */
+    public function __construct(
+        array $options = null,
+        string $message = null,
+        callable $normalizer = null,
+        array $groups = null,
+        mixed $payload = null,
+        array|string $fields = null,
+        public bool $allowNull = true,
+    ) {
+        parent::__construct($options, $groups, $payload);
+
+        $this->message = $message ?? $this->message;
+        $this->normalizer = $normalizer ?? $this->normalizer;
+        $this->fields = $fields ?? $this->fields;
+
+        if (null !== $this->normalizer && !\is_callable($this->normalizer)) {
+            throw new InvalidArgumentException(sprintf('The "normalizer" option must be a valid callable ("%s" given).', get_debug_type($this->normalizer)));
+        }
+    }
+}