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POCall Socket.io from Rail Active:Record callback or observer
 

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    <p>The good folks at LayerVault posted a easy way to add 'real-time' features on existing Ruby application without resorting to client side MCV or rewrite the entire app in Node.js, a while back. Their post show that you can update to all clients whenever your rails <strong>Models</strong> are updated [Reference 1] through delay_job &amp; Active:Record Observer:</p> <pre><code> class FileObserver &lt; ActiveRecord::Observer observer :lv_file def after_commit(record) record.delay.report_updated end end </code></pre> <p>and </p> <pre><code> class LVFile &lt; ActiveRecord::Base def report_updated Messenger.publish_message('file_updated', "file/#{self.id}") end end </code></pre> <p>[Reference 1] <code>http://layervault.tumblr.com/post/31462727280/rails-in-realtime-part-2</code></p> <p>Connect to socket.io server from client side javascript is easy. however I'm at lost how to implement <code>Messenger.publish_message('file_updated', "file/#{self.id}")</code> on rails server side. In the post they do mentioned that </p> <blockquote> <p>The report_updated method makes a class method call to a <strong>separate Messenger class</strong> (our Socket.IO interface on the web app side) and reports that a file has changed to the appropriate room. </p> </blockquote> <p>But I'm still not very sure how to implement <code>Messager</code> class in Rails so that Active:Record Observer will be able to connect to my socket.io server and send updates. </p> <p><strong>[PS]</strong> A conversation on HN indicates that they utilized <a href="https://github.com/lyondhill/socket.io-ruby-client" rel="nofollow">this gem</a></p> <p>The gem's wiki even included a brief demo:</p> <pre><code> require 'SocketIO' client = SocketIO.connect("http://localhost", sync: true) do before_start do on_message {|message| puts message} on_disconnect {puts "I GOT A DISCONNECT"} end after_start do emit("loadLogs", "/var/www/rails_app/log/production.log") end end puts "socket still running" loop do sleep 10 puts 'zzz' end </code></pre>
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