Rails - May 2009 - accepts_nested_attributes_for and add/remove nested model forms with JS

I''ve looked at the complex_form example app on GitHub, but I''m
not
sure I understand how it works.

For now I''ve managed to display the partial using the render command,
and stopped at the "add new item" link... Here''s the current
code:

    <%= f.error_messages %>

    <p>
      <%= f.label :name %><br />
      <%= f.text_field :name %>
    </p>

    <table id="recipe_ingredients">
      <tr>
        <th>ingredient</th>
        <th>in units</th>
        <th>quantity</th>
        <th>delete?</th>
      </tr>
      <% f.fields_for :recipe_ingredients do |ri_f| %>
        <%= render :partial => ''recipe_ingredient'',
:locals => { :f =>
ri_f } %>
      <% end %>
    </table>
    <p>
      <%# Add new item link here... %>
    </p>

    <p>
      <%= f.label :preparation %><br />
      <%= f.text_area :preparation %>
    </p>

What I''m not clear about in the example app at GitHub[1] is where the
link for creating the new item appears in the template code.
(Unfortunately, I wasn''t able to get the project up on my box, so I
don''t even know how the templates are rendered.)

If someone could explain (even if only in short) what is going on with
the app, or maybe point me to a simpler solution/example, I''d
appreciate it.

1: http://github.com/alloy/complex-form-examples/tree/master

--
Branko