Fixed problem with #file being nil after save.

git-svn-id: https://svn.thoughtbot.com/plugins/paperclip/trunk@425 7bbfaf0e-4d1d-0410-9690-a8bb5f8ef2aa

lib/paperclip/attachment.rb

@@ -98,6 +98,7 @@ module Paperclip
     # style. Useful for streaming with +send_file+.
     def to_io style = nil
       begin
+        style ||= @default_style
         @processed_files[style] || File.new(path(style))
       rescue Errno::ENOENT
         nil
@@ -211,7 +212,7 @@ module Paperclip
         FileUtils.mkdir_p( File.dirname(path(style)) )
         @processed_files[style] = file.stream_to(path(style)) unless file.path == path(style)
       end
-      @file = @processed_files[nil]
+      @file = @processed_files[@default_style]
     end
 
     def flush_deletes #:nodoc:

test/test_attachment.rb

@@ -84,6 +84,14 @@ class AttachmentTest < Test::Unit::TestCase
               assert_equal style[3].to_s, format.to_s
             end
           end
+
+          should "have #file be equal #to_io(:original)" do
+            assert @attachment.file == @attachment.to_io(:original)
+          end
+
+          should "still have its #file attribute not be nil" do
+            assert ! @attachment.file.nil?
+          end
         end
       end
     end