example of s3 configured paperclip attachment

picture.rb

has_attached_file :image, 
      :styles => { 
        :original => ["1000x1000", :jpg ],
        :medium => ["500x800", :jpg ],
        :small => ["300x500", :jpg ],
        :thumbnail => ["100x100#", :jpg ] 
      },
      :default_style => :medium,
      :storage => :s3,
      :path => ":style/:id_:basename.:extension",
      :s3_credentials => S3_KEYS,
      :s3_headers => {'Expires' => 10.year.from_now.httpdate},
      :bucket => 'app-name-uploads'