public function get_usergroups( $force = false ) {
		if( $force ) {

			$uiRes = $this->wiki->apiQuery(
				array(
					'action'  => 'query',
					'list'    => 'users',
					'ususers' => $this->username,
					'usprop'  => 'groups'
				)
			);

			$this->groups = $uiRes['query']['users'][0]['groups'];
		}
		return $this->groups;
	}