#168 Feed Parsing

sudo gem install pauldix-feedzirra
script/generate model feed_entry name:string summary:text url:string published_at:datetime guid:string
rake db:migrate

config.gem "pauldix-feedzirra", :lib => "feedzirra", :source => "http://gems.github.com"

FeedEntry.update_from_feed("http://feeds.feedburner.com/railscasts")
FeedEntry.count

class FeedEntry < ActiveRecord::Base
  def self.update_from_feed(feed_url)
    feed = Feedzirra::Feed.fetch_and_parse(feed_url)
    add_entries(feed.entries)
  end
  
  def self.update_from_feed_continuously(feed_url, delay_interval = 15.minutes)
    feed = Feedzirra::Feed.fetch_and_parse(feed_url)
    add_entries(feed.entries)
    loop do
      sleep delay_interval
      feed = Feedzirra::Feed.update(feed)
      add_entries(feed.new_entries) if feed.updated?
    end
  end
  
  private
  
  def self.add_entries(entries)
    entries.each do |entry|
      unless exists? :guid => entry.id
        create!(
          :name         => entry.title,
          :summary      => entry.summary,
          :url          => entry.url,
          :published_at => entry.published,
          :guid         => entry.id
        )
      end
    end
  end
end

<div id="recent_episodes">
  <h3>Recent Railscasts Episodes</h3>
  <ul>
  <% for entry in FeedEntry.all(:limit => 10, :order => "published_at desc") %>
    <li><%= link_to h(entry.name), entry.url %></li>
  <% end %>
  </ul>
</div>