# File lib/fog/profitbricks/models/compute/volume.rb, line 70
        def update
          requires :datacenter_id, :id

          options = {}
          options[:name] = name if name
          options[:size] = size if size

          data = service.update_volume(datacenter_id, id, options)
          merge_attributes(flatten(data.body))
          true
        end