title: Has anyone been able to get attachment_fu to work with rails 3?
body: <p>I have a rails application that is being upgraded from Rails 2.3.5 to Rails 3. It uses attachment_fu for file uploads. We're trying to do this conversion without making DB changes, so I'd like to avoid changing to paperclip or carrierwave at this time. </p>
  
  <p>Has anyone succeeded in using attachment_fu with Rails 3 and Ruby 1.9.2? We're using the most recent version of attachment_fu that claims to be ok for rails 3 and ruby 1.9.2, but getting 'TypeError (can't convert nil into Integer):' on any forms that include a file upload.</p>
  
  <p>All the answers to previous questions seem to be 'just switch to paperclip or carrierwave' as in:
  <a href="https://stackoverflow.com/questions/4445244/attachment-fu-or-paperclip-for-rails3">Attachment_fu or Paperclip for Rails3</a>
  or
  <a href="https://stackoverflow.com/questions/4723873/typeerror-cant-convert-nil-into-integer">TypeError (can&#39;t convert nil into Integer):</a></p>
  
  <p>Thanks!</p>