Rails 4 and ActionCable : <p>I am building a real time chat into a rails 4 application. It seems <code>ActionCable</code> is the tool for this kind of job. </p>

<p>Is it possible to use <code>ActionCable</code> in rails 4 or do I have update to rails 5?</p>

<p>I cannot find any introduction for <code>ActionCable</code> with rails 4. </p>
