Rails - Sep 2006 - setting different file_column options for certain files

i''ve used file_column for several projects and love it.

now i need to build an interface so the user can decide what to do with 
with a file when it''s being uploaded. if it''s just a file like
a pdf,
then just upload it. if it''s an image, let the user select what sizes 
he/she wants.

i''ve been reading about single table inheritance and wondering if that 
might be a good solution. so you could create subclasses for the model 
and have each one contain their own file_column options.

if i did it that way, i wouldn''t be sure how to specify what subclass 
handles the file when it''s uploaded.

or maybe there''s another way to handle it altogether. i''m not
sure, but
i would like to get any input anyone has.

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