Rails - Feb 2009 - editing multiple records at once

I want to be able to change a property on multiple records in my app. I
thought about adding a checkbox so that one can pick which records to
update. The question is how to implement the actual update - if the
checkbox isn''t part of the model, how can I iterate the records in the
view and see which are selected? My records are displayed using a
partial:

# _product.html.erb

<%= check_box_tag ''modify'' %>
<%=h product.name %>
<%=h product.price %>

# index.html.erb

<% form_tag %>

<%= text_field_tag ''price'' %>
<%= render :partial => ''product'', @collection =>
@products %>
<%= submit_tag ''save'' %>

<% end %>

Also, what kind of form should I put this in, and how to catch which
boxes are selected... I''m pretty clueless about this - thanks.
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I''ve decided on a different approach and I could use some help:

The page containing the records to modify also contains a small form to 
filter the displayed records. It uses observe_form to periodically call 
a function to filter the view.

I want to use this form filter as a selector on which records to update 
- it will be a two step process:

1. the user picks which records to update by applying the filter.
2. the user will update attributes using a different form.

The filter works by taking the selected attributes in it''s form and 
calling a helper function that returns a :conditions array "cond" to
use
with activerecord''s find function - @products = Product.find(:all, 
:conditions => cond).

This is all fine, but I have one problem - how can get have the
filter''s
conditions available to the updating function (which isn''t called from 
the observe_form helper)?

If I could have the :conditions available when I search which records to 
update, then everything will be simpler. Any advice will be more than 
welcomed :)

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