File: src/AppBundle/Resources/config/doctrine/mapping/Game.mongodb.xml

<doctrine-mongo-mapping xmlns="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping"
                        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                        xsi:schemaLocation="http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping
                    http://doctrine-project.org/schemas/odm/doctrine-mongo-mapping.xsd">

    <document name="GameOThree\Core\Model\Game" collection="game">
        <field fieldName="id" id="true" />
        <embed-one field="player1" target-document="Player" />
        <embed-one field="player2" target-document="Player" />
        <embed-one field="controller" target-document="Player" />
        <field fieldName="startValue" type="integer" />
        <field fieldName="currentValue" type="integer" />
        <field fieldName="result" type="integer" />
        <field fieldName="winner" type="integer" />
        <field fieldName="lastInput" type="integer" />
        <field fieldName="status" type="integer" />
        <field fieldName="lastUpdate" type="date" />
        <field fieldName="lastUpdate" type="date" />
    </document>
</doctrine-mongo-mapping>