# File lib/fog/rackspace/models/auto_scale/group_config.rb, line 41
        def update
          options = {}
          options['name'] = name unless name.nil?
          options['cooldown'] = cooldown unless cooldown.nil?
          options['minEntities'] = min_entities
          options['maxEntities'] = max_entities
          options['metadata'] = metadata unless metadata.nil?

          service.update_group_config(group.id, options)
          true
        end