Rails - Jun 2007 - syntax for the two flavors of field helpers

I''m using the following in a form_for, in order to display and edit
two activity_details in the same form as an activity.

      <% fields_for "activity_detail[]", @delivery do |detail|
%>
              ...
              <%= detail.text_field ''start_mileage'' %>
              ...
      <% end %>
      <% fields_for "activity_detail[]", @pickup do |detail| %>
              ...
              <%= detail.text_field ''end_mileage'' %>
              ...
      <% end %>

It works like a charm.  However, I''d now like to use Stuart
Rackham''s
date kit helper to format and select some dates for each activity
detail.

e.g. <%= date_field(''person'', ''birthday'',
:value => @person.birthday)
%>

My question is this: What arguments do I pass for this style (non-
member) of form helper in the context of an array of models in a
fields_for, as above?

Page 490 of AWDWR 2nd ed. gives a clue that it should be possible.
Their (very simple case) example goes like this:

<% form_for :user do |form| %>
    Name: <%= text_field :user, :name %>


Any thoughts?

Thanks,
Brian


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