Added reprocess! method. The rake task will actually reprocess the data it has…

Added reprocess! method. The rake task will actually reprocess the data it has now instead of ignoring it.

lib/paperclip/attachment.rb

@@ -153,6 +153,22 @@ module Paperclip
       }
     end
 
+    # This method really shouldn't be called that often. It's expected use is in the
+    # paperclip:refresh rake task and that's it. It will regenerate all thumbnails
+    # forcefully, by reobtaining the original file and going through the post-process
+    # again.
+    def reprocess!
+      new_original = Tempfile.new("paperclip-reprocess")
+      old_original = to_file(:original)
+      new_original.write( old_original.read )
+      new_original.rewind
+
+      @queued_for_write = { :original => new_original }
+      post_process
+
+      old_original.close if old_original.respond_to?(:close)
+    end
+
     private
 
     def valid_assignment? file #:nodoc:

tasks/paperclip_tasks.rake

@@ -25,7 +25,7 @@ namespace :paperclip do
     instances.each do |instance|
       names.each do |name|
         result = if instance.send("#{ name }?")
-          instance.send(name).send("post_process")
+          instance.send(name).reprocess!
           instance.send(name).save
         else
           true