feat: add RSS feed functionality

- Introduce RssController to handle RSS feed requests
- Add a new route for the RSS feed
- Implement RSS feed view to display weather art
- Update application layout to include RSS feed link
- Set content type for RSS responses

This commit adds an RSS feed feature that allows users to
subscribe to updates on daily AI-generated weather art.
The feed includes the latest weather art and relevant
metadata, enhancing user engagement and accessibility.

Gemfile

@@ -67,6 +67,8 @@ gem "mini_magick", "~> 4.13.2"
 
 gem "redis", "~> 5.3"
 
+gem "builder", "~> 3.3"
+
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem "debug", platforms: %i[ mri windows ], require: "debug/prelude"

Gemfile.lock

@@ -523,6 +523,7 @@ DEPENDENCIES
   aws-sdk-s3 (~> 1.170)
   bootsnap
   brakeman
+  builder (~> 3.3)
   bullet (~> 8.0)
   capybara
   cssbundling-rails

app/controllers/application_controller.rb

@@ -2,6 +2,7 @@ class ApplicationController < ActionController::Base
   include SeoConcern
   # Only allow modern browsers supporting webp images, web push, badges, import maps, CSS nesting, and CSS :has.
   before_action :log_browser_info
+  before_action :set_content_type_for_rss, if: -> { request.format.rss? }
   # allow_browser versions: :modern
   # allow_browser versions: :modern,
   #               patterns: [
@@ -78,4 +79,8 @@ class ApplicationController < ActionController::Base
   def set_locale
     I18n.locale = params[:locale] || I18n.default_locale
   end
+
+  def set_content_type_for_rss
+    response.headers["Content-Type"] = "application/rss+xml; charset=utf-8"
+  end
 end

app/controllers/rss_controller.rb

@@ -0,0 +1,9 @@
+class RssController < ApplicationController
+  def feed
+    @weather_arts = WeatherArt.order(created_at: :desc).limit(20)
+
+    respond_to do |format|
+      format.rss { render layout: false }
+    end
+  end
+end

app/helpers/rss_helper.rb

@@ -0,0 +1,2 @@
+module RssHelper
+end

app/views/layouts/_footer.html.erb

@@ -1,6 +1,13 @@
 <!-- 页脚 -->
 <footer class="footer footer-center p-8 bg-base-200 text-base-content">
   <div class="container mx-auto flex flex-col gap-2">
+    <%= link_to rss_feed_path(format: :rss), class: "btn btn-ghost", title: "RSS Feed" do %>
+      <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 5c7.18 0 13 5.82 13 13M6 11a7 7 0 017 7m-6 0a1 1 0 11-2 0 1 1 0 012 0z" />
+      </svg>
+      <!--      <span class="ml-2">RSS Feed</span>-->
+    <% end %>
+
     <div id="busuanzi_container" class="text-xs opacity-70">
       <div class="space-x-2">
         <span>Page: </span>

app/views/layouts/application.html.erb

@@ -33,6 +33,8 @@
     <%# Includes all stylesheet files in app/assets/stylesheets %>
     <%= javascript_include_tag "application", "data-turbo-track": "reload", type: "module" %>
     <%= stylesheet_link_tag "application", "data-turbo-track": "reload" %>
+    <%= auto_discovery_link_tag :rss, rss_feed_url(format: :rss), title: 'RSS Feed' %>
+
     <script defer data-domain="todayaiweather.com" src="https://plausible.frytea.com/js/script.js"></script>
 
     <script defer src="https://busuanzi.frytea.com/js"></script>

app/views/rss/feed.rss.builder

@@ -0,0 +1,24 @@
+# app/views/rss/feed.rss.builder
+xml.instruct! :xml, version: "1.0"
+xml.rss version: "2.0",
+        "xmlns:atom" => "http://www.w3.org/2005/Atom" do
+  xml.channel do
+    xml.title "Today AI Weather Art"
+    xml.description "Daily AI-generated weather art and forecasts"
+    xml.link root_url
+    xml.language "en"
+    xml.atom :link, href: rss_feed_url(format: :rss), rel: "self", type: "application/rss+xml"
+
+    @weather_arts.each do |art|
+      xml.item do
+        xml.title "#{art.city.full_name}  Weather Art"
+        xml.description art.description
+        xml.pubDate art.created_at.to_fs(:rfc822)
+        xml.link city_weather_art_url(art.city, art)
+        xml.guid city_weather_art_url(art.city, art)
+        # 如果有图片，添加图片链接
+        xml.enclosure url: rails_blob_url(art.webp_image.processed), type: "image/jpeg" if art.image.attached?
+      end
+    end
+  end
+end

config/routes.rb

@@ -25,6 +25,7 @@ Rails.application.routes.draw do
   get "cities/show"
   get "home/index"
   get "sitemaps/*path", to: "sitemaps#show", format: false
+  get "feed", to: "rss#feed", format: "rss", as: :rss_feed
 
   devise_for :admin_users, ActiveAdmin::Devise.config
   ActiveAdmin.routes(self)

test/controllers/rss_controller_test.rb

@@ -0,0 +1,7 @@
+require "test_helper"
+
+class RssControllerTest < ActionDispatch::IntegrationTest
+  # test "the truth" do
+  #   assert true
+  # end
+end