class GdsApi::PublishingApiV2

def get_linkables(document_type: nil, format: nil)

Other tags:
    See: https://github.com/alphagov/publishing-api/blob/master/doc/api.md#get-v2linkables -
def get_linkables(document_type: nil, format: nil)
  if document_type.nil?
    if format.nil?
      raise ArgumentError.new("Please provide a `document_type`")
    else
      self.class.logger.warn(
        "Providing `format` to the `get_linkables` method is deprecated and will be removed in a " +
        "future release.  Please use `document_type` instead."
      )
      document_type = format
    end
  end
  get_json("#{endpoint}/v2/linkables?document_type=#{document_type}")
end