symfony
diff --git a/‎src/Symfony/Bridge/Doctrine/Tests/Fixtures/UserUuidNameDto.php
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+24Lines changed: 24 additions & 0 deletions b/‎src/Symfony/Bridge/Doctrine/Tests/Fixtures/UserUuidNameDto.php
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+24Lines changed: 24 additions & 0 deletions
diff --git a/‎src/Symfony/Bridge/Doctrine/Tests/Fixtures/UserUuidNameEntity.php
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+29Lines changed: 29 additions & 0 deletions b/‎src/Symfony/Bridge/Doctrine/Tests/Fixtures/UserUuidNameEntity.php
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+29Lines changed: 29 additions & 0 deletions
diff --git a/‎src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
+25Lines changed: 25 additions & 0 deletions b/‎src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/Tests/Validator/Constraints/UniqueEntityValidatorTest.php
+25Lines changed: 25 additions & 0 deletions
diff --git a/‎src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
+6Lines changed: 6 additions & 0 deletions b/‎src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
Copy file name to clipboardExpand all lines: src/Symfony/Bridge/Doctrine/Validator/Constraints/UniqueEntityValidator.php
+6Lines changed: 6 additions & 0 deletions
@@ -0,0 +1,24 @@
+<?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\Bridge\Doctrine\Tests\Fixtures;
+
+use Symfony\Component\Uid\Uuid;
+
+class UserUuidNameDto
+{
+    public function __construct(
+        public ?Uuid $id,
+        public ?string $fullName,
+        public ?string $address,
+    ) {
+    }
+}
@@ -0,0 +1,29 @@
+<?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\Bridge\Doctrine\Tests\Fixtures;
+
+use Doctrine\ORM\Mapping\Column;
+use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\Id;
+use Symfony\Component\Uid\Uuid;
+
+#[Entity]
+class UserUuidNameEntity
+{
+    public function __construct(
+        #[Id, Column]
+        public ?Uuid $id = null,
+        #[Column(unique: true)]
+        public ?string $fullName = null,
+    ) {
+    }
+}
@@ -41,9 +41,12 @@
 use Symfony\Bridge\Doctrine\Tests\Fixtures\UpdateCompositeIntIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\UpdateCompositeObjectNoToStringIdEntity;
 use Symfony\Bridge\Doctrine\Tests\Fixtures\UpdateEmployeeProfile;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\UserUuidNameDto;
+use Symfony\Bridge\Doctrine\Tests\Fixtures\UserUuidNameEntity;
 use Symfony\Bridge\Doctrine\Tests\TestRepositoryFactory;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntity;
 use Symfony\Bridge\Doctrine\Validator\Constraints\UniqueEntityValidator;
+use Symfony\Component\Uid\Uuid;
 use Symfony\Component\Validator\Exception\ConstraintDefinitionException;
 use Symfony\Component\Validator\Exception\UnexpectedValueException;
 use Symfony\Component\Validator\Test\ConstraintValidatorTestCase;
@@ -116,6 +119,7 @@ private function createSchema($em)
             $em->getClassMetadata(Employee::class),
             $em->getClassMetadata(CompositeObjectNoToStringIdEntity::class),
             $em->getClassMetadata(SingleIntIdStringWrapperNameEntity::class),
+            $em->getClassMetadata(UserUuidNameEntity::class),
         ]);
     }
 
@@ -1401,4 +1405,25 @@ public function testEntityManagerNullObjectWhenDTODoctrineStyle()
 
         $this->validator->validate($dto, $constraint);
     }
+
+    public function testUuidIdentifierWithSameValueDifferentInstanceDoesNotCauseViolation()
+    {
+        $uuidString = 'ec562e21-1fc8-4e55-8de7-a42389ac75c5';
+        $existingPerson = new UserUuidNameEntity(Uuid::fromString($uuidString), 'Foo Bar');
+        $this->em->persist($existingPerson);
+        $this->em->flush();
+
+        $dto = new UserUuidNameDto(Uuid::fromString($uuidString), 'Foo Bar', '');
+
+        $constraint = new UniqueEntity(
+            fields: ['fullName'],
+            entityClass: UserUuidNameEntity::class,
+            identifierFieldNames: ['id'],
+            em: self::EM_NAME,
+        );
+
+        $this->validator->validate($dto, $constraint);
+
+        $this->assertNoViolation();
+    }
 }
@@ -197,6 +197,12 @@ public function validate(mixed $value, Constraint $constraint): void
 
             foreach ($constraint->identifierFieldNames as $identifierFieldName) {
                 $propertyValue = $this->getPropertyValue($entityClass, $identifierFieldName, current($result));
+                if ($fieldValues[$identifierFieldName] instanceof \Stringable) {
+                    $fieldValues[$identifierFieldName] = (string) $fieldValues[$identifierFieldName];
+                }
+                if ($propertyValue instanceof \Stringable) {
+                    $propertyValue = (string) $propertyValue;
+                }
                 if ($fieldValues[$identifierFieldName] !== $propertyValue) {
                     $entityMatched = false;
                     break;