Add extra fields using JMS Serializer bundle

Question

I\'ve an entity I usually serialize using the JMS Serializer bundle. I have to add to the serialization some fields that doesn\'t reside in the entity itself but are gathere

Answer 1

What about this: http://jmsyst.com/libs/serializer/master/handlers

In summary, you define a class that receives an object and returns text or an array (that will be converted to json).

You have class "IndexedStuff" that contains a weird calculated field that for some reason should be calculated at serialization time.

Now create the handler

em = $registry->getEntityManager();
    }
    public static function getSubscribingMethods()
    {
        return array(
            array(
                'direction' => GraphNavigator::DIRECTION_SERIALIZATION,
                'format' => 'json',
                'type' => 'Project/Model/IndexedStuff',
                'method' => 'serializeIndexedStuffToJson',
            ),
        );
    }

    public function serializeIndexedStuffToJson(JsonSerializationVisitor $visitor, Project/Model/IndexedStuff $stuff, array $type, Context $context)
    {
        // Build your object here and return it
        $score = $this->em->find("ProjectBundle:Calculator", $stuff->value)
        return array("score" => $score->getIndexScore(), "name"=> $score->name
    }
}

Finally register the service

services:
  project.serializer.stuff:
      class: Project\Serializer\MyHandler
      calls:
        - [setEntityManager, ["@doctrine"]]

Now everywhere you want to serialize an object of type "IndexedStuff" you will get a json like this

{"name": "myName", "score" => 0.3432}

By this way you can fully customize how your entity is serialized