title: Rails: rubocop disable Class has too many lines error
body: <p>I have a class with constants, many constants. And rubocop is complaining about the length of this Class, which I don't care how long it gets.</p>
  
  <p>I want to disable rubocop's error: "Class has too many lines" but the following is not working:</p>
  
  <pre><code># rubocop:disable ClassLength
  </code></pre>
  
  <p>Also, the following isn't either:</p>
  
  <pre><code># rubocop:disable Metrics/ClassLength
  </code></pre>
  
  <p>What is the correct metric that I need to disable?</p>