I've been using attachment_fu to upload images in a rails application. Everything was working well except the thumbnails weren't generating. I think everyone follow's Mike Clark's excellent blog:
http://clarkware.com/cgi/blosxom/2007/02/24
He doesn't mention that the parent_id is required, so I thought it was simply the id of the model to which the photo/upload was attached.
After some digging, I found a conversation here:
http://www.ruby-forum.com/topic/104213
Turns out attachment_fu, creates a new entry for each thumbnail, then strings them together with the parent_id. So, make sure you keep the parent_id column otherwise attachment_fu silently fails to generate the thumbnails.
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