class ActiveSupport::Cache::Store
def expanded_version(key)
def expanded_version(key) case when key.respond_to?(:cache_version) then key.cache_version.to_param when key.is_a?(Array) then key.map { |element| expanded_version(element) }.tap(&:compact!).to_param when key.respond_to?(:to_a) then expanded_version(key.to_a) end end