module ActiveRecord # Active Record automatically timestamps create and update operations if the table has fields # named created_at/created_on or updated_at/updated_on. # # Timestamping can be turned off by setting # ActiveRecord::Base.record_timestamps = false # # Timestamps are in the local timezone by default but you can use UTC by setting # ActiveRecord::Base.default_timezone = :utc module Timestamp def self.included(base) #:nodoc: base.alias_method_chain :create, :timestamps base.alias_method_chain :update, :timestamps base.class_inheritable_accessor :record_timestamps, :instance_writer => false base.record_timestamps = true end # Saves the record with the updated_at/on attributes set to the current time. # If the save fails because of validation errors, an ActiveRecord::RecordInvalid exception is raised. # If an attribute name is passed, that attribute is used for the touch instead of the updated_at/on attributes. # # Examples: # # product.touch # updates updated_at # product.touch(:designed_at) # updates the designed_at attribute def touch(attribute = nil) current_time = current_time_from_proper_timezone if attribute write_attribute(attribute, current_time) else write_attribute('updated_at', current_time) if respond_to?(:updated_at) write_attribute('updated_on', current_time) if respond_to?(:updated_on) end save! end private def create_with_timestamps #:nodoc: if record_timestamps current_time = current_time_from_proper_timezone write_attribute('created_at', current_time) if respond_to?(:created_at) && created_at.nil? write_attribute('created_on', current_time) if respond_to?(:created_on) && created_on.nil? write_attribute('updated_at', current_time) if respond_to?(:updated_at) && updated_at.nil? write_attribute('updated_on', current_time) if respond_to?(:updated_on) && updated_on.nil? end create_without_timestamps end def update_with_timestamps(*args) #:nodoc: if record_timestamps && (!partial_updates? || changed?) current_time = current_time_from_proper_timezone write_attribute('updated_at', current_time) if respond_to?(:updated_at) write_attribute('updated_on', current_time) if respond_to?(:updated_on) end update_without_timestamps(*args) end def current_time_from_proper_timezone self.class.default_timezone == :utc ? Time.now.utc : Time.now end end end