Controller/HydraController.php
public function serialize($entity)
    {
        if (!$this->container->has('hydra.serializer')) {
            throw new \LogicException('The HydraBundle is not registered in your application.');
        }

        return $this->container->get('hydra.serializer')->serialize($entity, self::FORMAT);
    }
public function serialize($entity)
    {
        if (!$this->container->has('hydra.serializer')) {
            throw new \LogicException('The HydraBundle is not registered in your application.');
        }

        return $this->container->get('hydra.serializer')->serialize($entity, self::FORMAT);
    }
Shortcut to serialize an entity into JSON-LD

This method uses the Hydra Serializer service and therefore requires
that the HydraBundle is registered.

@param object $entity The entity to serialize

@return string The entity serialized in JSON-LD

@throws \LogicException If HydraBundle is not available