fallback = new UnserializeObjectConstructor(); } public function construct(DeserializationVisitorInterface $visitor, ClassMetadata $metadata, $data, array $type, DeserializationContext $context): ?object { if ('JMS\Serializer\Tests\Fixtures\BlogPost' !== $type['name']) { return $this->fallback->construct($visitor, $metadata, $data, $type, $context); } return new BlogPost('This is a nice title.', new Author('Foo Bar'), new \DateTime('2011-07-30 00:00', new \DateTimeZone('UTC')), new Publisher('Bar Foo')); } }