<?php
use Doctrine\ODM\MongoDB\Mapping\Annotations AS ODM;
 
/**
 * @ODM\Document(collection="my_documents")
 * @ODM\ChangeTrackingPolicy("DEFERRED_IMPLICIT")
 * @ODM\HasLifecycleCallbacks
 */
class EcommerceOrder
{
    /**
     * @ODM\Id(strategy="NONE")
     * @ODM\GeneratedValue(strategy="SEQUENCE")
     */
    private $id;
 
    /**
     * @ODM\Field(type="datetime", nullable=true)
     */
    private $ordered_at;
 
    /**
     * @ODM\Field(type="string", nullable=true)
     */
    private $customer_note;
 
    /**
     * @ODM\Field(type="string", nullable=true)
     */
    private $internal_note;
 
    /**
     * @ODM\ReferenceOne(targetDocument="Address")
     */
    private $DeliveryAddress;
 
    /**
     * @ODM\ReferenceOne(targetDocument="Address")
     */
    private $BillingAddress;
}

<?xml version="1.0"?>
<doctrine-mongo-mapping
 xmlns="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping" 
 xsi="http://www.w3.org/2001/XMLSchema-instance" 
 schemaLocation="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd">
  <document 
	 name="EcommerceOrder" 
	 change-tracking-policy="DEFERRED_IMPLICIT">
    <field name="id" type="integer" length="4">
      <generator strategy="SEQUENCE"/>
    </field>
    <field name="ordered_at" type="datetime" nullable="true"/>
    <field name="customer_note" type="string" nullable="true" version="true"/>
    <field name="internal_note" type="string" nullable="true" version="true"/>
    <lifecycle-callbacks>
      <lifecycle-callback type="prePersist" method="prePersist"/>
    </lifecycle-callbacks>
    <reference-one field="DeliveryAddress" target-document="Address"/>
    <reference-one field="BillingAddress" target-document="Address"/>
    <options>
      <option name="charset" value="utf8"/>
      <option name="collate" value="utf8_unicode_ci"/>
    </options>
  </document>
</doctrine-mongo-mapping>

EcommerceOrder:
  type: document
  changeTrackingPolicy: DEFERRED_IMPLICIT
  fields:
    id:
      id: true
      type: integer
      length: 4
      generator:
        strategy: SEQUENCE
      options:
        unsigned: true
    ordered_at:
      type: datetime
      nullable: true
    customer_note:
      type: string
      nullable: true
      version: true
    internal_note:
      type: string
      nullable: true
      version: true
  options:
    charset: utf8
    collate: utf8_unicode_ci
  lifecycleCallbacks:
    prePersist: [prePersist]
  referenceOne:
    DeliveryAddress:
      targetDocument: Address
    BillingAddress:
      targetDocument: Address