SomeController.php

<?php

namespace Acme\DemoBundle\Controller;

use Acme\DemoBundle\Documents\User;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Doctrine\ODM\MongoDB\DocumentManager;
use Doctrine\ODM\MongoDB\Configuration;
use Doctrine\MongoDB\Connection;
use Doctrine\Common\Annotations\AnnotationReader;
use Doctrine\ODM\MongoDB\Mapping\Driver\AnnotationDriver;

class SomeController extends Controller
{
    public function someAction()
    {
        $config = new Configuration();
        $config->setProxyDir(__DIR__ . '/../Proxies');
        $config->setProxyNamespace('Proxies');
        $config->setHydratorDir(__DIR__ . '/../Hydrator');
        $config->setHydratorNamespace('Hydrator');

        $reader = new AnnotationReader();
        $reader->setDefaultAnnotationNamespace('Doctrine\ODM\MongoDB\Mapping\\');
        $config->setMetadataDriverImpl(new AnnotationDriver($reader, __DIR__ . '/../Documents'));

        $dm = DocumentManager::create(new Connection(), $config);

        // Add a User
        $user = new User();
        $user->setName('Brent');
        $user->setEmail('[email protected]');
        
        $dm->persist($user);
        
        $dm->flush();