default services conflit ?

old.vendor/symfony/validator/Constraints/UniqueValidator.php

@@ -0,0 +1,54 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\ConstraintValidator;
+use Symfony\Component\Validator\Exception\UnexpectedTypeException;
+use Symfony\Component\Validator\Exception\UnexpectedValueException;
+
+/**
+ * @author Yevgeniy Zholkevskiy <zhenya.zholkevskiy@gmail.com>
+ */
+class UniqueValidator extends ConstraintValidator
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function validate($value, Constraint $constraint)
+    {
+        if (!$constraint instanceof Unique) {
+            throw new UnexpectedTypeException($constraint, Unique::class);
+        }
+
+        if (null === $value) {
+            return;
+        }
+
+        if (!\is_array($value) && !$value instanceof \IteratorAggregate) {
+            throw new UnexpectedValueException($value, 'array|IteratorAggregate');
+        }
+
+        $collectionElements = [];
+        foreach ($value as $element) {
+            if (\in_array($element, $collectionElements, true)) {
+                $this->context->buildViolation($constraint->message)
+                    ->setParameter('{{ value }}', $this->formatValue($value))
+                    ->setCode(Unique::IS_NOT_UNIQUE)
+                    ->addViolation();
+
+                return;
+            }
+            $collectionElements[] = $element;
+        }
+    }
+}