Backend Development
XML/RSS Tutorial
Creating and Consuming RSS Feeds in a Ruby on Rails Application
Creating and Consuming RSS Feeds in a Ruby on Rails Application
要在Ruby on Rails中创建RSS订阅源，需先在routes.rb中添加rss路由，再在控制器中定义rss动作并渲染无布局的RSS模板，最后用builder文件编写符合规范的XML结构；2. 消费外部RSS则需引入feedjira gem，通过Feedjira.parse解析远程feed内容，并可结合Rails.cache缓存提升性能；两者均无需外部API，直接利用Rails内置XML支持与标准RSS格式即可完成。
If you're building a Ruby on Rails app and want to expose content via RSS (like blog posts or updates), or consume external RSS feeds, it's actually straightforward — especially since Rails has built-in support for generating XML feeds. Here's how to do both.
✅ Creating RSS Feeds in Rails
This is perfect if you want to let users subscribe to your blog, news, or any regularly updated content.
1. Add a route for the feed
In config/routes.rb:
resources :posts do
collection do
get :rss
end
end2. Create the controller action
In app/controllers/posts_controller.rb:
def rss
@posts = Post.published.limit(20).order(created_at: :desc)
respond_to do |format|
format.rss { render layout: false }
end
end3. Create the RSS view template
Make a file at app/views/posts/rss.rss.builder:
xml.instruct! :xml, version: "1.0"
xml.rss version: "2.0" do
xml.channel do
xml.title "Your App Blog"
xml.description "Latest posts from our blog"
xml.link root_url
@posts.each do |post|
xml.item do
xml.title post.title
xml.description post.body
xml.pubDate post.created_at.to_s(:rfc822)
xml.link post_url(post)
xml.guid post_url(post)
end
end
end
end? Tip: Use .to_s(:rfc822) for proper RSS date formatting. Also, make sure your URLs are absolute (use _url helpers, not _path).
Now your feed is live at /posts.rss.
? Consuming External RSS Feeds
To pull in and parse feeds from elsewhere (like news sources or partner blogs), use the feedjira gem — it’s reliable and handles many feed formats.
1. Add the gem
In your Gemfile:
gem 'feedjira'
Then run bundle install.
2. Fetch and parse a feed
Example in a controller or service object:
require 'feedjira' feed_url = "https://example.com/feed.rss" feed = Feedjira.parse(open(feed_url).read) feed.entries.each do |entry| puts entry.title puts entry.url puts entry.published end
3. Store or display the data
You might want to:
- Cache the feed (use
Rails.cache.fetchwith a TTL) - Store entries in a model like
ExternalFeedItem - Display them in a view (e.g., "Latest from Industry News")
Example caching:
@external_posts = Rails.cache.fetch('external_feed', expires_in: 1.hour) do
feed = Feedjira.parse(open('https://example.com/feed.rss').read)
feed.entries.first(10)
endBonus Tips
- For SEO and discoverability, add this to your layout’s
<head>:<%= auto_discovery_link_tag(:rss, posts_rss_path, title: 'RSS Feed') %>
- Test your feed with W3C Feed Validation Service
- If you have multiple content types (e.g., videos + articles), consider separate feeds per type.
That’s it! You can now both publish and consume RSS in your Rails app — no external APIs needed for basic use cases. Just clean, standard XML and a few helpers.
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