SonataUserBundle/Resources/config/doctrine/BaseUser.mongodb.xml

<?xml version="1.0" encoding="UTF-8"?>
<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
                  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                  xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
                  http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

    <mapped-superclass name="Sonata\UserBundle\Document\BaseUser">
        <field name="createdAt" type="date" />
        <field name="updatedAt" type="date" />

        <lifecycle-callbacks>
            <lifecycle-callback type="prePersist" method="prePersist" />
            <lifecycle-callback type="preUpdate" method="preUpdate" />
        </lifecycle-callbacks>
    </mapped-superclass>

</doctrine-mapping>