title: Rails 3: undefined method `remote_form_for'
body: <p>I have a fairly simple Rails remote form in HAML in a partial under shared/users:</p>
  
  <pre><code>- remote_form_for :user, :url =&gt; { :controller =&gt; "users", :action =&gt; "create" } do |f|
    .field
      = f.label :name, t('name')
      = f.text_field :name
    .field
      = f.label :email, t('email')
      = f.text_field :email
    .actions
      = f.submit
  </code></pre>
  
  <p>No matter how much I fiddle with it, this just won't work. I alway get the following error:</p>
  
  <pre><code>undefined method `remote_form_for' for #&lt;#&lt;Class:0x1036e8e40&gt;:0x1036dfd90&gt;
  </code></pre>
  
  <p>Am I doing something stupid? It works perfectly with form_for.</p>