rails3 drag'n drop upload store method

_store_upload.rb

# forked from http://kray.jp/blog/rails3-fileupload/
  def _store_upload(file)
    if request.xhr?
      if request.body.size == request.headers['CONTENT_LENGTH'].to_i
        file_data = request.body.read 
        file_name = file
      end
    else
      if file.instance_of?(File)
        file_data = file.read
        file_name = file.original_filename
      end
    end
    
    raise "upload failure" unless file_data

    temp_file = Tempfile.new(file_name)
    temp_file << file_data.force_encoding('utf-8')
    @picture = Picture.new
    @picture.image = temp_file
    @picture.image_file_name = file_name
    @picture.user = current_user if current_user
    @picture.tags << current_tag if current_tag
    @picture.stories << current_story if current_story
    @picture.save
    temp_file.close!
    @picture
  end