title: How to use ActionController::Base.helpers.strip_tags in custom class
body: <p>Ruby newbie here.</p>
  
  <p>I create a class called My_table (without extend anything). I want to use ActionController::Base.helpers.strip_tags(text).</p>
  
  <p>I put the following on the top of my class, but that doesn't work.</p>
  
  <pre><code>require 'rubygems'
  gem rails
  </code></pre>