Missing rel=self link?

[dgmstuart]

When I validate an atom feed produced by this gem I get a warning:

Missing atom:link with rel="self"

https://validator.w3.org/feed/docs/warning/MissingSelf.html

I don't know if this is something which I can add using the gem's DSL or would it require a change in the source code?

Source:

    RSS::Maker.make('atom') do |maker|
      maker.channel.author = 'Swing Out London'
      maker.channel.updated = Audit.maximum(:created_at).iso8601
      maker.channel.id = 'https://www.swingoutlondon.com/'
      maker.channel.link = 'https://www.swingoutlondon.com/audit_log.atom'
      maker.channel.title = 'Swing Out London Audit Log'
      maker.channel.description = 'Audit Log for Swing Out London'

      audits.each do |audit|
        editor = Editor.build(audit)
        maker.items.new_item do |item|
          item.link = audit_show_link(audit.auditable_type, audit.auditable_id)
          item.title = audit_title(audit)
          item.updated = audit.created_at.iso8601
          item.author = editor.name
          item.description = JSON.pretty_generate(audit.as_json)
        end
      end
    end

Atom:

<?xml version="1.0" encoding="UTF-8"?>
<feed xmlns="http://www.w3.org/2005/Atom"
  xmlns:dc="http://purl.org/dc/elements/1.1/">
  <author>
    <name>Swing Out London</name>
  </author>
  <id>https://www.swingoutlondon.com/</id>
  <link href="https://www.swingoutlondon.com/audit_log.atom"/>
  <subtitle>Audit Log for Swing Out London</subtitle>
  <title>Swing Out London Audit Log</title>
  <updated>2022-04-07T20:59:47Z</updated>
  <entry>
   <!-- ... -->

[kou]

Use the following code:

      link = maker.channel.links.new_link
      link.href = 'https://www.swingoutlondon.com/audit_log.atom'
      link.rel = 'self'

[dgmstuart]

Ah that makes sense - thank you!