# File lib/paperclip/interpolations.rb, line 30
    def self.interpolate pattern, *args
      pattern = args.first.instance.send(pattern) if pattern.kind_of? Symbol
      all.reverse.inject(pattern) do |result, tag|
        result.gsub(/:#{tag}/) do |match|
          send( tag, *args )
        end
      end
    end