Rails - Dec 2005 - File upload generated with scaffold ?

Hi,

   I''d like scaffold option to generate a file upload form and display 
skel.Is it possible ? Do I need to use specific plugins or is it included in 
current rails version ? What mysql field to use for file ?

(Currently, I''m using scaffold ; it generates render :partial =>
''form'' ;
how to update that scheme for file upload ?)

Regards,
Fabian