Prevent that bad Ignore method annotations lead to incorrect results

fix #45016

Author: astepin

src/Symfony/Component/Serializer/Mapping/Loader/AnnotationLoader.php

@@ -134,6 +134,10 @@ public function loadClassMetadata(ClassMetadataInterface $classMetadata): bool
 
                     $attributeMetadata->setSerializedName($annotation->getSerializedName());
                 } elseif ($annotation instanceof Ignore) {
+                    if (!$accessorOrMutator) {
+                        throw new MappingException(sprintf('Ignore on "%s::%s()" cannot be added. Ignore can only be added on methods beginning with "get", "is", "has" or "set".', $className, $method->name));
+                    }
+
                     $attributeMetadata->setIgnore(true);
                 } elseif ($annotation instanceof Context) {
                     if (!$accessorOrMutator) {

src/Symfony/Component/Serializer/Tests/Fixtures/Annotations/Entity45016.php

@@ -0,0 +1,25 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Annotations;
+
+use Symfony\Component\Serializer\Annotation\Ignore;
+
+class Entity45016
+{
+    public function __construct(private int $id = 1234) {}
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    /**
+     * @Ignore()
+     */
+    public function badIgnore(): bool
+    {
+        return true;
+    }
+}

src/Symfony/Component/Serializer/Tests/Fixtures/Attributes/Entity45016.php

@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Symfony\Component\Serializer\Tests\Fixtures\Attributes;
+
+use Symfony\Component\Serializer\Annotation\Ignore;
+
+class Entity45016
+{
+    public function __construct(private int $id = 1234) {}
+
+    public function getId(): int
+    {
+        return $this->id;
+    }
+
+    #[Ignore]
+    public function badIgnore(): bool
+    {
+        return true;
+    }
+}

src/Symfony/Component/Serializer/Tests/Mapping/Loader/AnnotationLoaderTest.php

@@ -134,6 +134,19 @@ public function testThrowsOnContextOnInvalidMethod()
         $loader->loadClassMetadata($classMetadata);
     }
 
+    public function testCanHandleUnrelatedIgnoredMethods()
+    {
+        $class = $this->getNamespace() . '\Entity45016';
+
+        $this->expectException(MappingException::class);
+        $this->expectExceptionMessage(sprintf('Ignore on "%s::badIgnore()" cannot be added', $class));
+
+        $metadata = new ClassMetadata($class);
+        $loader = $this->getLoaderForContextMapping();
+
+        $loader->loadClassMetadata($metadata);
+    }
+
     abstract protected function createLoader(): AnnotationLoader;
 
     abstract protected function getNamespace(): string;