Rails - Oct 2007 - STI vs CTI vs something else?...

Hey gang,

I have these classes:

class Image < UploadFile
  validates_file_format_of :filename, :in => ["gif",
"png", "jpg"]
end

class UploadFile < PropertyItem
  file_column :filename
  validates_presence_of :filename
end

class PropertyItem < ActiveRecord::Base
  validates_presence_of :name
end

What I''m trying to achieve is a class inheritance tree with multiple
STIs. So, Image would have a column caption:string in it''s table, and
UploadFile a column fiilename:string, whereas PropertyItem would have
created_at, updated_at and such.
Is this possible at all? I''m really stumped...

thanks!
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