Symfony 4/JMS/FOSUser: Can't serialize datas from FOS\UserBundle - jms

Question

There is A LOT of similar quesions, some of them have validated answers, but here I am and none of them worked.
My use case is pretty simple:
My users App\Client\common\Entities\User belong to a customer App\Client\common\Entities\Customer.
App\Client\common\Entities\User also inherits FOS\UserBundle\Model\User which contains the holy property "email"
I want to serialize all my customers AND their users (including their mail). Jms works pretty well except i can not access properties from the FOS\UserBundle\Model\User class.
following this answer here is what I have now.
jms_serializer.yml
jms_serializer:
#blablablaa....
metadata:
auto_detection: true
directories:
App:
namespace_prefix: 'App\Client'
path: '%kernel.project_dir%/serializer'
FOSUB:
namespace_prefix: 'FOS\UserBundle'
path: '%kernel.project_dir%/serializer'
serializer/App.Client.common.Entities.User.yml :
App\Client\common\Entities\User:
exclusion_policy: ALL
properties:
surname:
expose: true
exclude: false
groups: [export]
serializer/Model.User.yml:
FOS\UserBundle\Model\User:
exclusion_policy: ALL
properties:
email:
expose: true
exclude: false
groups: [export]
src/Command/DeploySyncUsersCommand.php:
protected function execute(InputInterface $input, OutputInterface $output)
{
$users = $this->customerRepository->findAll(); //this is an array of Customer
$context = new SerializationContext();
$context->setGroups(['export']);
$serializer = SerializerBuilder::create()->build();
$json = $serializer->serialize($users, 'json', $context);
// do something with json
}
Everything works fine except the json does NOT contain email or any FOSUser\User data.
Also something interesting is that I can write anything (even invalid yml) in the App.Client.common.Entities.User.yml and Model.User.yml files, I'm able to clear the cache with no errors. I have errors when I write invalid yml in jms_serializer.yml

Answer 1

Ok I've been able to solve this using dependency injection instead of building the serializer
/**
* #var SerializerInterface
*/
private SerializerInterface $serializer;
/**
* #var string
*/
private string $reportAnalysisUrl;
public function __construct(SerializerInterface $serialzer, $reportAnalysis)
{
$this->serializer = $serialzer;
parent::__construct();
}
protected function execute(InputInterface $input, OutputInterface $output)
{
$users = $this->customerRepository->findAll();
$context = new SerializationContext();
$context->setGroups(['export']);
$json = $this->serializer->serialize($users, 'json', $context);
//do something with json
}
so now my yml files aren't ignored anymore