Sample custom doctrine hydrator

module.config.php

<?php
return array(
    'doctrine-hydrator' => array(
        'MyApi\\V1\\Rest\\Assets\\AssetsHydrator' => array(
            'entity_class' => 'Application\\Entity\\Asset',
            'object_manager' => 'doctrine.documentmanager.odm_default',
            'by_value' => true,
            'strategies' => [
                'categories' => 'DoctrineHydrationModule\Strategy\ODM\MongoDB\EmbeddedReferenceCollection',
                'userGroups' => 'DoctrineHydrationModule\Strategy\ODM\MongoDB\EmbeddedReferenceCollection',
            ]
        ),
    )
);