title: How do I add an Rails form helper HTML attribute that does not contain a quoted value?
body: <p>For example, "required."</p>
  
  <p>Rails chokes on any attempt to add the attribute thus:</p>
  
  <pre><code>&lt;%= f.email_field :email, :"ng-model" =&gt; "whatever", :class =&gt; "form-control input-lg", :"required" %&gt;
  </code></pre>