Well I've tried both and it doesn't work. My generated html source for 
the form:

<input id="sale_unit_price" name="sale[unit_price]" size="10" 
type="text" />


Mikel Lindsaar wrote:
> On Wed, Oct 1, 2008 at 2:29 PM, Allen Walker
> <[EMAIL PROTECTED]> wrote:
>> <%= observe_form( :sales_form, :url => {:action => "update_sales_form"},
>> :update => :sale_unit_price) %>
> 
>> Now when i make a change to the form (click around, etc), it is calling
>> "update_sales_form". But apparently I'm confused as to how to update the
>> "unit_price" element in the DOM.
> 
> Did you mean to type:
> 
>  <%= observe_form( :sales_form, :url => {:action => 
> "update_sales_form"},
>  :update => :unit_price) %>
>      ^^^^^^^^^^^^^^^^^^^^^^^^^
> 
> unit_price not sale_unit_price ?
> 
> Mikel
> 
> --
> http://lindsaar.net/
> Rails, RSpec and Life blog....

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