title: Can't get pluralize/singularize working with ActiveSupport::Inflector (in irb)
body: <pre><code>irb(main):001:0&gt; require 'active_support'
  =&gt; true
  irb(main):002:0&gt; require 'active_support/inflector/inflections'
  =&gt; true
  irb(main):003:0&gt; ActiveSupport::Inflector.pluralize('test')
  =&gt; "test"
  irb(main):004:0&gt; ActiveSupport::Inflector.singularize('tests')
  =&gt; "tests"
  irb(main):005:0&gt; ActiveSupport::Inflector.titleize('hat simulator')
  =&gt; "Hat Simulator"
  &lt;ort::Inflector.tableize("america's number one hat simulator")
  =&gt; "america's number one hat simulator"
  </code></pre>
  
  <p>Well, basically, that's the question. It's confusing me that methods such as <code>titleize</code> seem to work fine, but <code>tableize</code>, <code>pluralize</code> and <code>singularize</code> don't.</p>
  
  <p>Have I forgotten to require something?</p>
  
  <p>(On a separate note, I notice <a href="http://api.rubyonrails.org/classes/ActiveSupport/Inflector.html">this page</a> provides examples like <code>"post".pluralize</code>, which when I tried, resulted in <code>NoMethodError: undefined method 'pluralize' for "post":String</code>. But maybe that's something to save for another question.)</p>