{% if object.username %}
<input type="hidden" name="type" value="User"/>
<input type="hidden" name="username" value="{{object.username|escape}}"/>

{% else %}
<input type="hidden" name="type" value="{{object.type|escape}}"/>
<input type="hidden" name="reference" value="{{object.reference|escape}}"/>
<input type="hidden" name="revision" value="{{object.revision|escape}}"/>

{% endif %}