title: How to implement if Registry does not exists in Rails?
body: <p>In my Rails App, I have a line that says:</p>
  
  <pre><code>&lt;% if user_signed_in? &amp;&amp; Registry.exists?(current_user.registry) %&gt;
  </code></pre>
  
  <p>How can I make it </p>
  
  <pre><code>if Registry. **does not** exists?(current_user.registry)
  </code></pre>
  
  <p>Thanks in advance.</p>