# File lib/active_record/base.rb, line 1492 def cache_key case when !persisted? "#{self.class.model_name.cache_key}/new" when timestamp = self[:updated_at] "#{self.class.model_name.cache_key}/#{id}-#{timestamp.to_s(:number)}" else "#{self.class.model_name.cache_key}/#{id}" end end