Rails - Nov 2006 - Saving form data with currency symbols / validating custom formats

I''m trying to display a numeric attribute of a model as a currency on a
form, and then save the user''s input.  So the text field might display
''$9.98'' and the user is allowed to enter dollar signs.   How
can I
remove the dollar sign before saving to the db and still display the
user''s original input string in error messages?

My template file looks like this:

   <%= text_field("winning[]", "amount",
           :value => number_to_currency(@winning.amount) %>

I tried manually removing the dollar signs from the values in the
params hash before applying them to the models (via update_attributes)
but then the models don''t have the user''s original inputs, and
I''m
using the error_messages_for tag to display the errors.   I was also
trying to avoid hacking presentation format knowledge into the model
object if possible.

Any ideas?  

Thanks!

Steve


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