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Storing a document in a different collection - Mongodb with symfony2
public function createAction(){
$post = new Post();
$post->setUrl('A Foo Bar');
$post->setTitle('asdf');
$dm = $this->get('doctrine.odm.mongodb.document_manager');
$dm->persist($post);
$dm->flush();
return new Response('Created post id '.$post->getId());}

<?php

namespace MyProjectDocument;

use DoctrineODMMongoDBMappingAnnotations as ODM;

/**
 * @ODMDocument(
 *     collection="charlies_posts"
 * )
 */
class Post
{

DocumentsUser:
  type: document
  db: my_db
  collection: charlies_post