how to store and send files using attachment_fu with db_backend

# instead of using the "binary" type suggested by the README, use a "longblob" type (at least, in mysql)
create_table :db_files do |t|
  t.column :data, :longblob 
end

# to send the file in your controller
# if photo is the object using attachment_fu
def download
  send_data( photo.current_data, :type => photo.content_type, :filename => photo.filename, :disposition => 'attachment' )
end