Howto: rebuild thumbnails in attachment_fu

rubyonrails-talk
1

I've just added a new thumbnail definition to a class that has attachments using attachment_fu. Since this thumbnail definition didn't exist when I uploaded pior images, they don't have this thumbnail. I have been trying to figure out how to either load the image attachment and have it build the thumbnail. Does anyone know how to do this?

Thanks in advance.

Russell

2

Here's some example code from the Kete project (http://kete.net.nz):

http://github.com/kete/kete/blob/master/lib/tasks/tools.rake - starting at line 61

Cheers, Walter

3

I ran across this post while looking for a solution to the same problem. In the end, this worked for me in the attachment model class:

  # use attachment_fu protected methods to remake thumbs   def remake_thumbnails!     self.thumbnails.each {|thumb| thumb.destroy}     temp_file = create_temp_file     attachment_options[:thumbnails].each do |suffix, size|       self.create_or_update_thumbnail(temp_file, suffix, *size)     end   end

I use this in a rake task so I can rebuild all thumbnails when needed.

cheers, -foz