cck facets?

i do have them for select lists. I tried making a custom one for an autocomplete box following the tutorial at acquia

function my_module_cck_field_mappings() {
        $mappings = array();
        $mappings['userreference'] = array(
                'callback' => 'my_module_userreference_callback',
                'index_type' => 'string',
                'widget_types' => array(
                        'userreference_autocomplete' => TRUE,
                        ),
        );
        return $mappings;
}

function my_module_userreference_callback($node, $fieldname) {
        $fields = array();
  foreach($node->$fieldname as $field){
                $fields[] = array('safe' => check_plain($field['value']));
        }
        return $fields;
}

Am I close? Anything I do show you to get a better idea of why I am not gettign any cck facets?

I should have been more clear in #2. I do not have any cck facets, period. I do have cck fields that use select lists