paperclip sample

figure.rb

# app/models/figure.rb
class Figure < ActiveRecord::Base
  has_attached_file :image, 
    :styles => { :medium => "300x300>", :thumb => "100x100>" }, 
    :storage => :s3,
    :s3_host_name => "s3-us-west-1.amazonaws.com", 
    :s3_credentials => "#{Rails.root}/config/s3.yml",
    :path => ":attachment/:id/:style/:filename" 
end