helpers.rb

module Helpers

  # Conventient way to setup filesystem attachment uploading when in dev/testing
  # and use S3 otherwise
  module AssetStorage

    def self.included(within)
      within.class_eval do
        extend ClassMethods
      end
    end

    module ClassMethods

      def stores_file_as(asset_type, opts = {})
        filename_interpolation = opts[:filename_interpolation] || ':style.:extension'
        options = use_local_storage? ?
                filesystem_default_options(filename_interpolation) :
                s3_default_options(filename_interpolation)
        options = options.merge(opts)
        has_attached_file asset_type, options
      end

      private

      def use_local_storage?
        @use_local_storage ||= !(Rails.env.production? || Rails.env.staging?)
      end

      def s3_default_options(filename_interpolation)

        # Akamai URL -> origin URL -> Rails env
        # N/A -> origin.staticassets.development.theslap.digitaltoniq.com -> development
        # staticassets.theslap.digitaltoniq.com -> origin.staticassets.theslap.digitaltoniq.com -> staging
        # staticassets.beta.theslap.com -> origin.staticassets.beta.theslap.com -> beta
        # staticassets.theslap.com -> origin.staticassets.theslap.com -> production
        {
          :storage => :s3,
          :s3_credentials => "#{RAILS_ROOT}/config/s3.yml",
          :path => "/:style/:filename"
        }
      end

      def filesystem_default_options(filename_interpolation)
        {
          ## Add any local file system options you may want here ...
          # :url => "/assets/:class/:slug/#{filename_interpolation}",
          # :path => ":rails_root/public/assets/:class/:slug/#{filename_interpolation}"
        }
      end

    end
  end
end