Rails - Oct 2010 - Rails 3 -NoMethodError (undefined method `original_filename

Hello! I''m using Rails 3, Uploadify, to send images to S3.

Right now all the images being uploaded to S3 have the MIME:
application/octet-stream

I''d like to fix that but I''m getting the following error:

    NoMethodError (undefined method `original_filename'' for
#<ActiveSupport::HashWithIndifferentAccess:0x107c81998>):
      app/models/photo.rb:29:in `upload_file=''
      app/controllers/photos_controller.rb:15:in `upload''
      app/middleware/flash_session_cookie_middleware.rb:14:in `call''


I think this is because all the tutorials out there aren''t Rails 3
friendly. Anyone have any ideas? Here''s the code:


    # Controller

    def create
    @photo = @photoalbum.photos.build(:upload_file => params[:photo])
      ...
    end

    # Model

    class Photo < ActiveRecord::Base
      require ''mime/types''
      ...
      def upload_file=(data)
        data.content_type MIME::Types.type_for(data.original_filename).to_s
        self.image = data
      end
    end

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