require 'active_support/deprecation/proxy_wrappers' module Rails class DeprecatedConstant < ActiveSupport::Deprecation::DeprecatedConstantProxy def self.deprecate(old, current) constant = new(old, current) eval "::#{old} = constant" end private def target ::Kernel.eval @new_const.to_s end end DeprecatedConstant.deprecate('RAILS_CACHE', '::Rails.cache') end