Allow extending #[AsAlias] attribute

ruudk · ruudk · commit 8c3f68c13544 · 2025-06-18T12:27:01.000+02:00
This allows people to extend the `#[AsAlias]` attribute with something like this: ```php namespace App\Symfony; use Symfony\Component\DependencyInjection\Attribute\AsAlias; final class AsProductionAlias extends AsAlias { /** * @param string|null $id The id of the alias * @param bool $public Whether to declare the alias public */ public function __construct( public ?string $id = null, public bool $public = false, ) { parent::__construct($id, $public, ['prod']); } } ``` This is similar to a previous change I did for the `#[When]` attribute, that was accepted: - #47196
diff --git a/src/Symfony/Component/DependencyInjection/Attribute/AsAlias.php b/src/Symfony/Component/DependencyInjection/Attribute/AsAlias.php
@@ -17,7 +17,7 @@
  * @author Alan Poulain <contact@alanpoulain.eu>
  */
 #[\Attribute(\Attribute::TARGET_CLASS | \Attribute::IS_REPEATABLE)]
-final class AsAlias
+class AsAlias
 {
     /**
      * @var list<string>
diff --git a/src/Symfony/Component/DependencyInjection/CHANGELOG.md b/src/Symfony/Component/DependencyInjection/CHANGELOG.md
@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+7.4
+---
+
+ * Allow #[AsAlias] to be extended
+
 7.3
 ---
 
diff --git a/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php b/src/Symfony/Component/DependencyInjection/Loader/FileLoader.php
@@ -216,7 +216,7 @@ public function registerClasses(Definition $prototype, string $namespace, string
             }
             $r = $this->container->getReflectionClass($class);
             $defaultAlias = 1 === \count($interfaces) ? $interfaces[0] : null;
-            foreach ($r->getAttributes(AsAlias::class) as $attr) {
+            foreach ($r->getAttributes(AsAlias::class, \ReflectionAttribute::IS_INSTANCEOF) as $attr) {
                 /** @var AsAlias $attribute */
                 $attribute = $attr->newInstance();
                 $alias = $attribute->id ?? $defaultAlias;
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/PrototypeAsAlias/WithCustomAsAlias.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/PrototypeAsAlias/WithCustomAsAlias.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias;
+
+use Symfony\Component\DependencyInjection\Attribute\AsAlias;
+
+#[AsProductionAlias(id: AliasFooInterface::class)]
+class WithCustomAsAlias
+{
+}
+
+#[\Attribute(\Attribute::TARGET_CLASS | \Attribute::IS_REPEATABLE)]
+final class AsProductionAlias extends AsAlias
+{
+    /**
+     * @param string|null         $id     The id of the alias
+     * @param bool                $public Whether to declare the alias public
+     */
+    public function __construct(
+        public ?string $id = null,
+        public bool $public = false,
+    ) {
+        parent::__construct($id, $public, ['prod']);
+    }
+}
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php b/src/Symfony/Component/DependencyInjection/Tests/Loader/FileLoaderTest.php
@@ -45,6 +45,7 @@
 use Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias\WithAsAliasInterface;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias\WithAsAliasMultiple;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias\WithAsAliasProdEnv;
+use Symfony\Component\DependencyInjection\Tests\Fixtures\PrototypeAsAlias\WithCustomAsAlias;
 use Symfony\Component\DependencyInjection\Tests\Fixtures\Utils\NotAService;
 
 class FileLoaderTest extends TestCase
@@ -368,6 +369,8 @@ public function testRegisterClassesWithAsAlias(string $resource, array $expected
     public static function provideResourcesWithAsAliasAttributes(): iterable
     {
         yield 'Private' => ['PrototypeAsAlias/{WithAsAlias,AliasFooInterface}.php', [AliasFooInterface::class => new Alias(WithAsAlias::class)]];
+        yield 'PrivateCustomAlias' => ['PrototypeAsAlias/{WithCustomAsAlias,AliasFooInterface}.php', [AliasFooInterface::class => new Alias(WithCustomAsAlias::class)], 'prod'];
+        yield 'PrivateCustomAliasNoMatch' => ['PrototypeAsAlias/{WithCustomAsAlias,AliasFooInterface}.php', [], 'dev'];
         yield 'Interface' => ['PrototypeAsAlias/{WithAsAliasInterface,AliasFooInterface}.php', [AliasFooInterface::class => new Alias(WithAsAliasInterface::class)]];
         yield 'Multiple' => ['PrototypeAsAlias/{WithAsAliasMultiple,AliasFooInterface}.php', [
             AliasFooInterface::class => new Alias(WithAsAliasMultiple::class, true),

Original file line number	Diff line number	Diff line change
`@@ -17,7 +17,7 @@`
`17`	`17`	`* @author Alan Poulain <contact@alanpoulain.eu>`
`18`	`18`	`*/`
`19`	`19`	`#[\Attribute(\Attribute::TARGET_CLASS \| \Attribute::IS_REPEATABLE)]`
`20`		`-final class AsAlias`
	`20`	`+class AsAlias`
`21`	`21`	`{`
`22`	`22`	`/**`
`23`	`23`	`* @var list<string>`
Original file line number	Diff line number	Diff line change
`@@ -216,7 +216,7 @@ public function registerClasses(Definition $prototype, string $namespace, string`
`216`	`216`	`}`
`217`	`217`	`$r = $this->container->getReflectionClass($class);`
`218`	`218`	`$defaultAlias = 1 === \count($interfaces) ? $interfaces[0] : null;`
`219`		`- foreach ($r->getAttributes(AsAlias::class) as $attr) {`
	`219`	`+ foreach ($r->getAttributes(AsAlias::class, \ReflectionAttribute::IS_INSTANCEOF) as $attr) {`
`220`	`220`	`/** @var AsAlias $attribute */`
`221`	`221`	`$attribute = $attr->newInstance();`
`222`	`222`	`$alias = $attribute->id ?? $defaultAlias;`