paperclip_processors.rb

# 
# http://github.com/thoughtbot/paperclip/issues/issue/247
# 

#
# put this in the relevant section of your config/application.rb
#

config.after_initialize do

  # copied from paperclip.rb: due to bundler, this doesn't seem to happen automagically anymore!?!
  Dir.glob(File.join(File.expand_path(Rails.root), "lib", "paperclip_processors", "*.rb")).each do |processor|
    require processor # PVDB don't rescue LoadError... let it rip!
  end

end

This snippet can be used to work around this Paperclip issue reported against Rails3...