Not enabling native lazy objects on PHP 8.4+ is deprecated since Doctrine ORM v3.5

composer.json

@@ -11,9 +11,9 @@
         "ext-iconv": "*",
         "ext-pdo_sqlite": "*",
         "doctrine/dbal": "^4.0",
-        "doctrine/doctrine-bundle": "^2.11",
+        "doctrine/doctrine-bundle": "^2.16",
         "doctrine/doctrine-migrations-bundle": "^3.3",
-        "doctrine/orm": "^3.0",
+        "doctrine/orm": "^3.5",
         "league/commonmark": "^2.1",
         "symfony/apache-pack": "^1.0",
         "symfony/asset": "^7",

config/packages/doctrine.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Loader\Configurator;
+
+return static function (ContainerConfigurator $container): void {
+    $container->extension('doctrine', [
+        'orm' => [
+            'enable_native_lazy_objects' => \PHP_VERSION_ID >= 80400,
+        ],
+    ]);
+};

config/packages/doctrine.yaml

@@ -8,14 +8,15 @@ doctrine:
 
         profiling_collect_backtrace: '%kernel.debug%'
         use_savepoints: true
+
     orm:
         auto_generate_proxy_classes: true
-        enable_lazy_ghost_objects: true
         report_fields_where_declared: true
         validate_xml_mapping: true
         naming_strategy: doctrine.orm.naming_strategy.underscore_number_aware
         identity_generation_preferences:
             Doctrine\DBAL\Platforms\PostgreSQLPlatform: identity
+
         auto_mapping: true
         mappings:
             App:
@@ -24,6 +25,7 @@ doctrine:
                 dir: '%kernel.project_dir%/src/Entity'
                 prefix: 'App\Entity'
                 alias: App
+
         controller_resolver:
             auto_mapping: false
 

tests/Doctrine/ORM/ConfigurationTest.php

@@ -0,0 +1,32 @@
+<?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 App\Tests\Doctrine\ORM;
+
+use Doctrine\ORM\Configuration;
+use Symfony\Bundle\FrameworkBundle\Test\KernelTestCase;
+
+class ConfigurationTest extends KernelTestCase
+{
+    private function getConfiguration(): Configuration
+    {
+        return static::getContainer()->get('doctrine.orm.default_configuration');
+    }
+
+    public function testNativeLazyObjectsSetting(): void
+    {
+        if (\PHP_VERSION_ID >= 80400) {
+            $this->assertTrue($this->getConfiguration()->isNativeLazyObjectsEnabled());
+        } else {
+            $this->assertFalse($this->getConfiguration()->isNativeLazyObjectsEnabled());
+        }
+    }
+}