Paperclip extension to work with nginx upload module

paperclip_extensions.rb

module Paperclip
  class Attachment
    
    class UploadedPath
      attr_reader :original_filename, :content_type, :size, :path
      def initialize(uploaded_file)
        @original_filename    = uploaded_file["name"].downcase
        @content_type = uploaded_file["content_type"].to_s.strip
        @file_size    = uploaded_file["size"].to_i
        @path         = uploaded_file["path"]
	`#{Rails.root}/script/chmod #{@path}`
      end
      
      def to_tempfile
        self
      end
      
      def close
      end
    end
    
    def assign_with_upload(uploaded_file)
      uploaded_file = UploadedPath.new(uploaded_file) if uploaded_file.is_a?(Hash)
      assign_without_upload(uploaded_file) 
    end

    alias_method_chain :assign, :upload
  end
end