JMS Serializer ignored my YML Entity exclusions - symfony

Question

My config is
jms_serializer:
metadata:
auto_detection: true
directories:
NameOfBundle:
namespace_prefix: ""
path: "#VendorNameOfBundle/Resources/config/serializer"
My YML file named Entity.Project.yml contains
Vendor\NameOfBundle\Entity\Project:
exclusion_policy: ALL
properties:
id:
expose: true
I am loading the serializer like so from within a Controller
$serializer = SerializerBuilder::create()
->configureListeners(function(EventDispatcher $dispatcher) {
$dispatcher->addSubscriber(new ProjectSubscriber($this->container));
})
->addDefaultListeners()
->build();
This completely ignored my YML file and exposes all fields from the Project. I have cleared the cache.
But if I use this instead without the custom subscriber, then the exclusions work
$serializer = $this->get("jms_serializer");
Even explicitly adding a dir does not work either
$serializer = SerializerBuilder::create()
->configureListeners(function(EventDispatcher $dispatcher) {
$dispatcher->addSubscriber(new ProjectSubscriber($this->container));
})
->addDefaultListeners()
->addMetadataDir(realpath($this->get('kernel')->getRootDir()."/../") . '/src/Vendor/NameOfBundle/Resources/config/serializer')
->build();
The docs are not clear on how this path should befined. The above method does not error, but does not pull in the YML files. The below method errors and says the directory does not exist;
$serializer = SerializerBuilder::create()
->configureListeners(function(EventDispatcher $dispatcher) {
$dispatcher->addSubscriber(new ProjectSubscriber($this->container));
})
->addDefaultListeners()
->addMetadataDir('#VendorNameOfBundle/Resources/config/serializer')
->build();
How do I make the JMS Serializer look at my YML file in order to exclude the fields and also use the Subscriber?

Answer 1

As i see from documentation you need to setup your Yaml files:
it is necessary to configure a metadata directory where those files are located:
$serializer =
JMS\Serializer\SerializerBuilder::create()
->addMetadataDir($someDir)
->build();
For more information read manual.

Answer 2

This was helpful Using JMSSerialize to serialize Doctrine2 Entities that follow SimplifiedYamlDriver convention
It would appear that the file names needs to be completely different if you do not specify a namespace. I never thought to specify a namespace as this is not mentioned in the main docs.
If there is no namespace then the addMetaDir usage is fine but you also need to make sure your file names look like this
Vendor.NameOfBundle.Entity.Project.yml