title: How to define Rails Helper for one specific action?
body: <p>I have a LabelTagHelper with a custom <code>label_tag</code> method, but I only need this method in my <strong>new</strong>, <strong>create</strong>, <strong>edit</strong> and <strong>update</strong> actions.</p>
  
  <p>Is there a way to define this helper only for a specific action? Something like <code>helper :label_tag, :only =&gt; [:new, :create, :update, :destroy]</code>? Or it is safe to call <code>self.class.helper :label_tag</code> in a before_filter?</p>