fix: Do not change readonly id when deleting (#9538)

src/UnitOfWork.php

@@ -35,6 +35,7 @@
 use Doctrine\ORM\Mapping\AssociationMapping;
 use Doctrine\ORM\Mapping\ClassMetadata;
 use Doctrine\ORM\Mapping\MappingException;
+use Doctrine\ORM\Mapping\PropertyAccessors\ReadonlyAccessor;
 use Doctrine\ORM\Mapping\ToManyInverseSideMapping;
 use Doctrine\ORM\Persisters\Collection\CollectionPersister;
 use Doctrine\ORM\Persisters\Collection\ManyToManyPersister;
@@ -1176,7 +1177,10 @@ private function executeDeletions(): void
             // Entity with this $oid after deletion treated as NEW, even if the $oid
             // is obtained by a new entity because the old one went out of scope.
             //$this->entityStates[$oid] = self::STATE_NEW;
-            if (! $class->isIdentifierNatural()) {
+            if (
+                ! $class->isIdentifierNatural() &&
+                ! $class->propertyAccessors[$class->identifier[0]] instanceof ReadonlyAccessor
+            ) {
                 $class->propertyAccessors[$class->identifier[0]]->setValue($entity, null);
             }
 

tests/Tests/ORM/Functional/Ticket/GH9538Test.php

@@ -0,0 +1,41 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Doctrine\Tests\ORM\Functional\Ticket;
+
+use Doctrine\ORM\Mapping\Column;
+use Doctrine\ORM\Mapping\Entity;
+use Doctrine\ORM\Mapping\GeneratedValue;
+use Doctrine\ORM\Mapping\Id;
+use Doctrine\Tests\OrmFunctionalTestCase;
+
+class GH9538Test extends OrmFunctionalTestCase
+{
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $this->setUpEntitySchema([
+            GH9538EntityA::class,
+        ]);
+    }
+
+    public function testCanRemoveEntityWithReadonlyId(): void
+    {
+        $this->_em->persist($entity = new GH9538EntityA());
+        $this->_em->flush();
+        $this->_em->remove($entity);
+        $this->_em->flush();
+        $this->expectNotToPerformAssertions();
+    }
+}
+
+#[Entity]
+class GH9538EntityA
+{
+    #[Column(type: 'integer')]
+    #[Id]
+    #[GeneratedValue(strategy: 'AUTO')]
+    public readonly int $id;
+}