S3 config for Paperclip

photo.rb

class Photo < ActiveRecord::Base
  has_attached_file :image,
    :styles => {
      :thumb  => '100x100',
      :large => '640x480',
    },
    :storage => :s3,
    :s3_credentials => "#{::Rails.root.to_s}/config/s3.yml",
    :path => ':attachment/:id/:style.:extension',
    :bucket => 'my-bucket',
    :s3_options => {
      :server => 's3.amazonaws.com'
    }
end