def render(self, session, logger, hostname, service, instance, force=False,
**arguments):
dbhost = hostname_to_host(session, hostname)
dbservice = Service.get_unique(session, service, compel=True)
chooser = Chooser(dbhost, logger=logger, required_only=False)
if instance:
dbinstance = get_service_instance(session, dbservice, instance)
chooser.set_single(dbservice, dbinstance, force=force)
else:
chooser.set_single(dbservice, force=force)
chooser.flush_changes()
chooser.write_plenary_templates()
return
