Sorry.. I totally submitted that before writing anything...

So what's happening is after doing a major overhaul of my site's code, and reimplementing scribd_fu with the latest version and Paperclip, whenever I go to save something or upload something to scribd, scribd_fu gets caught in an endless loop and saves a gazillion copies of the file to scribd.

From my debugging, it seems like somehow scribd is triggering the after_save :upload_to_scribd callback on itself. No one else seems to be complaining about this bug though...

Here's a sample stack trace from Eclipse:

ipaper-test.rb [Ruby Application]

Ruby
    Ruby Thread - 1 (Step end at /var/lib/gems/1.8/gems/scribd_fu-2.0.9/lib/scribd_fu.rb:70)    
        /var/lib/gems/1.8/gems/scribd_fu-2.0.9/lib/scribd_fu.rb:70  
        /var/lib/gems/1.8/gems/scribd_fu-2.0.9/lib/scribd_fu.rb:189 
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:178  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:178  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:166  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:93   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:92   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:92   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:276  
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/callbacks.rb:344    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/callbacks.rb:251    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2573    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/validations.rb:1090 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/dirty.rb:79 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:229 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:229 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:182 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:228 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:196 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:196 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2664    
        /var/lib/gems/1.8/gems/scribd_fu-2.0.9/lib/scribd_fu.rb:70  
        /var/lib/gems/1.8/gems/scribd_fu-2.0.9/lib/scribd_fu.rb:189 
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:178  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:178  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:166  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:93   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:92   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:92   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:276  
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/callbacks.rb:344    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/callbacks.rb:251    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2573    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/validations.rb:1090 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/dirty.rb:79 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:229 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:229 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:182 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:228 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:196 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:196 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2664    
        /var/lib/gems/1.8/gems/scribd_fu-2.0.9/lib/scribd_fu.rb:70  
        /var/lib/gems/1.8/gems/scribd_fu-2.0.9/lib/scribd_fu.rb:189 
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:178  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:178  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:166  
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:93   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:92   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:92   
        /var/lib/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:276  
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/callbacks.rb:344    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/callbacks.rb:251    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2573    
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/validations.rb:1090 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/dirty.rb:79 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:229 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:229 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:182 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:228 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:196 
        /var/lib/gems/1.8/gems/activerecord-2.3.8/lib/active_record/transactions.rb:196 
        /var/rails/XXXXXXXXXXXXXX/trunk/ipaper-test.rb:9    
/usr/bin/ruby (Oct 9, 2010 1:44:38 AM)

ipaper-test.rb contains:

!/usr/bin/env ruby

ENV['RAILS_ENV'] = 'development'
require File.dirname(FILE) + '/config/boot'
Rails.boot!
require "#{RAILS_ROOT}/config/environment"

r = SomeModel.first
r.menu = File.open('/tmp/myfile.pdf')
r.save

Everything saves fine if I comment out:

has_ipaper_and_uses 'Paperclip'

Any idea what's going on? I'm totally stumped.. Everything used to work perfectly...

FYI, I fixed this problem with the following patch.

--- /var/lib/gems/1.8/gems/scribd_fu-2.0.9/lib/scribd_fu.rb  2010-10-07 22:29:53.000000000 -0400
+++ vendor/plugins/scribd_fu/lib/scribd_fu.rb   2010-10-17 02:59:08.000000000 -0400
@@ -180,13 +180,17 @@
 
     def self.included(base)
       base.extend ClassMethods
+           @in_scribd_fu_upload = false
     end
 
     # Upload the associated file to Scribd for iPaper conversion
     # This is called +after_save+ and cannot be called earlier,
     # so don't get any ideas.
     def upload_to_scribd
+           return if @in_scribd_fu_upload
+           @in_scribd_fu_upload = true
       ScribdFu::upload(self, file_path) if scribdable?
+           @in_scribd_fu_upload = false
     end
 
     # Checks whether the associated file is convertable to iPaper