How to generate urls for tonic images

tonic.rb

#barlinks
@bar = Bar.all
@bar.each do |bar|
    puts bar.slug
end

#http://tonicapp.s3.amazonaws.com/back-in-black-recoleta.jpg


def to_slug
    #strip the string
    ret = self.strip

    #blow away apostrophes
    ret.gsub! /['`]/,""

    # @ --> at, and & --> and
    ret.gsub! /\s*@\s*/, " at "
    ret.gsub! /\s*&\s*/, " and "

    #replace all non alphanumeric, underscore or periods with underscore
     ret.gsub! /\s*[^A-Za-z0-9\.\-]\s*/, '_'  

     #convert double underscores to single
     ret.gsub! /_+/,"_"

     #strip off leading/trailing underscore
     ret.gsub! /\A[_\.]+|[_\.]+\z/,""

     ret
  end

#bar-drink links
@bar.each do |bar|
  bar.drinks.each do |drink|
    puts "#{bar.slug}-#{drink.name.to_slug.downcase}"
  end
end