Implementation of RSS and Atom feeds

app/controllers/feed_controller.rb

@@ -0,0 +1,14 @@
+class FeedController < ApplicationController
+  skip_before_action :authenticate_user!
+
+  # GET /feed.rss
+  # GET /feed.atom
+  def index
+    @talks = Talk.all.order(created_at: :desc).includes(:speakers).limit(100)
+
+    respond_to do |format|
+      format.rss { render layout: false }
+      format.atom { render layout: false }
+    end
+  end
+end

app/views/feed/index.atom.builder

@@ -0,0 +1,16 @@
+atom_feed do |feed|
+  feed.title("Ruby Videos")
+  feed.updated(@talks.first.updated_at)
+
+  @talks.each do |talk|
+    feed.entry(talk) do |entry|
+      entry.title(talk.title)
+      entry.summary(talk.description) if talk.description.present?
+      entry.link(href: talk_url(talk.slug))
+      entry.author do |author|
+        author_names = talk.speakers.pluck(:name).join(", ")
+        author.name(author_names.present? ? author_names : "Unknown")
+      end
+    end
+  end
+end

app/views/feed/index.rss.builder

@@ -0,0 +1,18 @@
+xml.instruct! :xml, version: "1.0"
+xml.rss version: "2.0" do
+  xml.channel do
+    xml.title "Ruby Videos"
+    xml.description "A collection of talks of Ruby conferences around the world"
+    xml.link root_url
+
+    @talks.each do |talk|
+      xml.item do
+        xml.title talk.title
+        xml.description talk.description
+        xml.pubDate DateTime.parse(talk.date.to_s).rfc822
+        xml.link talk_url(talk.slug)
+        xml.guid talk_url(talk.slug)
+      end
+    end
+  end
+end

app/views/layouts/application.html.erb

@@ -10,6 +10,10 @@
     <%= vite_client_tag %>
     <%= vite_javascript_tag "application" %>
     <%= vite_stylesheet_tag "application.css" %>
+
+    <%= auto_discovery_link_tag :rss, feed_url(format: :rss) %>
+    <%= auto_discovery_link_tag :atom, feed_url(format: :atom) %>
+
     <%= yield :head %>
   </head>
 

config/routes.rb

@@ -14,6 +14,9 @@
   get "sign_up", to: "registrations#new"
   post "sign_up", to: "registrations#create"
 
+  # rss feed
+  get "feed", to: "feed#index"
+
   resources :sessions, only: [:index, :show, :destroy]
   resource :password, only: [:edit, :update]
   namespace :identity do

test/controllers/feed_controller_test.rb

@@ -0,0 +1,29 @@
+require "test_helper"
+
+class FeedControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    @talks = talks(:one, :two)
+    frozen_date_time = DateTime.new(2022, 1, 15, 10, 0, 0)
+    @talks.each do |talk|
+      talk.update!(created_at: frozen_date_time, updated_at: frozen_date_time)
+    end
+  end
+
+  test "should get rss format" do
+    get feed_url(format: :rss)
+
+    assert_response :success
+    assert_equal "/feed.rss", path
+    assert_equal "application/rss+xml; charset=utf-8", response.content_type
+    assert_equal File.read("test/fixtures/files/feed.rss"), response.parsed_body
+  end
+
+  test "should get atom format" do
+    get feed_url(format: :atom)
+
+    assert_response :success
+    assert_equal "/feed.atom", path
+    assert_equal "application/atom+xml; charset=utf-8", response.content_type
+    assert_equal File.read("test/fixtures/files/feed.atom"), response.parsed_body
+  end
+end

test/fixtures/files/feed.atom

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<feed xml:lang="en-US" xmlns="http://www.w3.org/2005/Atom">
+  <id>tag:www.example.com,2005:/feed</id>
+  <link rel="alternate" type="text/html" href="http://www.example.com"/>
+  <link rel="self" type="application/atom+xml" href="http://www.example.com/feed.atom"/>
+  <title>Ruby Videos</title>
+  <updated>2022-01-15T10:00:00Z</updated>
+  <entry>
+    <id>tag:www.example.com,2005:Talk/298486374</id>
+    <published>2022-01-15T10:00:00Z</published>
+    <updated>2022-01-15T10:00:00Z</updated>
+    <link rel="alternate" type="text/html" href="http://www.example.com/talks/talk-title-2"/>
+    <title>talk title 2</title>
+    <summary>talk descritpion 2</summary>
+    <link href="http://www.example.com/talks/talk-title-2"/>
+    <author>
+      <name>Obie Fernandez</name>
+    </author>
+  </entry>
+  <entry>
+    <id>tag:www.example.com,2005:Talk/980190962</id>
+    <published>2022-01-15T10:00:00Z</published>
+    <updated>2022-01-15T10:00:00Z</updated>
+    <link rel="alternate" type="text/html" href="http://www.example.com/talks/talk-title-1"/>
+    <title>talk title 1</title>
+    <summary>talk descritpion 1</summary>
+    <link href="http://www.example.com/talks/talk-title-1"/>
+    <author>
+      <name>Obie Fernandez</name>
+    </author>
+  </entry>
+</feed>

test/fixtures/files/feed.rss

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<rss version="2.0">
+  <channel>
+    <title>Ruby Videos</title>
+    <description>A collection of talks of Ruby conferences around the world</description>
+    <link>http://www.example.com/</link>
+    <item>
+      <title>talk title 2</title>
+      <description>talk descritpion 2</description>
+      <pubDate>Sat, 1 Jan 2022 00:00:00 +0000</pubDate>
+      <link>http://www.example.com/talks/talk-title-2</link>
+      <guid>http://www.example.com/talks/talk-title-2</guid>
+    </item>
+    <item>
+      <title>talk title 1</title>
+      <description>talk descritpion 1</description>
+      <pubDate>Sat, 1 Jan 2022 00:00:00 +0000</pubDate>
+      <link>http://www.example.com/talks/talk-title-1</link>
+      <guid>http://www.example.com/talks/talk-title-1</guid>
+    </item>
+  </channel>
+</rss>

test/fixtures/talks.yml

@@ -24,9 +24,13 @@ one:
   description: talk descritpion 1
   slug: talk-title-1
   year: 2022
+  speakers: one
+  date: 2022-01-01
 
 two:
   title: talk title 2
   description: talk descritpion 2
   slug: talk-title-2
   year: 2022
+  speakers: one
+  date: 2022-01-01