class GdsApi::ListResponse

def next_page
  # This shouldn't be a performance problem, since the cache will generally
  # avoid us making multiple requests for the same page, but we shouldn't
  # allow the data to change once it's already been loaded, so long as we
  # retain a reference to any one page in the sequence
  @next_page ||= if has_next_page?
    @api_client.get_list! page_link("next").href
  else
    nil
  end
end