Now Attachment instance is passed as third argument to Processor#make.

(cherry picked from commit e655fbe502fbae2b538922b35c6d2f55b1fee3d1)

lib/paperclip/attachment.rb

@@ -359,7 +359,7 @@ def post_process_styles
           raise RuntimeError.new("Style #{name} has no processors defined.") if args[:processors].blank?
           @queued_for_write[name] = args[:processors].inject(@queued_for_write[:original]) do |file, processor|
             log("Processing #{name} #{file} in the #{processor} processor.")
-            Paperclip.processor(processor).make(file, args)
+            Paperclip.processor(processor).make(file, args, self)
           end
         rescue PaperclipError => e
           log("An error was received while processing: #{e.inspect}")

lib/paperclip/processor.rb

@@ -17,18 +17,19 @@ module Paperclip
   # See Paperclip.run for more information about using command-line
   # utilities from within Processors.
   class Processor
-    attr_accessor :file, :options
+    attr_accessor :file, :options, :attachment
 
-    def initialize file, options = {}
+    def initialize file, options = {}, attachment = nil
       @file = file
       @options = options
+      @attachment = attachment
     end
 
     def make
     end
 
-    def self.make file, options = {}
-      new(file, options).make
+    def self.make file, options = {}, attachment = nil
+      new(file, options, attachment).make
     end
   end
 

lib/paperclip/thumbnail.rb

@@ -10,7 +10,7 @@ class Thumbnail < Processor
     # unless specified. Thumbnail creation will raise no errors unless
     # +whiny+ is true (which it is, by default. If +convert_options+ is
     # set, the options will be appended to the convert command upon image conversion 
-    def initialize file, options = {}
+    def initialize file, options = {}, attachment = nil
       super
       geometry          = options[:geometry]
       @file             = file

test/attachment_test.rb

@@ -317,8 +317,13 @@ class Paperclip::Test < Paperclip::Processor; end
 
       before_should "call #make on all specified processors" do
         expected_params = @style_params[:once].merge({:processors => [:thumbnail, :test], :whiny => nil, :convert_options => ""})
-        Paperclip::Thumbnail.expects(:make).with(@file, expected_params).returns(@file)
-        Paperclip::Test.expects(:make).with(@file, expected_params).returns(@file)
+        Paperclip::Thumbnail.expects(:make).with(@file, expected_params, @dummy.avatar).returns(@file)
+        Paperclip::Test.expects(:make).with(@file, expected_params, @dummy.avatar).returns(@file)
+      end
+
+      before_should "call #make with attachment passed as third argument" do
+        expected_params = @style_params[:once].merge({:processors => [:thumbnail, :test], :whiny => nil, :convert_options => ""})
+        Paperclip::Test.expects(:make).with(@file, expected_params, @dummy.avatar).returns(@file)
       end
     end
   end