module ActiveRecord # = Active Record Timestamp # # 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 # # == Time Zone aware attributes # # By default, ActiveRecord::Base keeps all the datetime columns time zone aware by executing following code. # # ActiveRecord::Base.time_zone_aware_attributes = true # # This feature can easily be turned off by assigning value false . # # If your attributes are time zone aware and you desire to skip time zone conversion for certain # attributes then you can do following: # # Topic.skip_time_zone_conversion_for_attributes = [:written_on] module Timestamp extend ActiveSupport::Concern included do class_inheritable_accessor :record_timestamps, :instance_writer => false self.record_timestamps = true end private def create #:nodoc: if record_timestamps current_time = current_time_from_proper_timezone all_timestamp_attributes.each do |column| write_attribute(column.to_s, current_time) if respond_to?(column) && self.send(column).nil? end end super end def update(*args) #:nodoc: if should_record_timestamps? current_time = current_time_from_proper_timezone timestamp_attributes_for_update_in_model.each do |column| column = column.to_s next if attribute_changed?(column) write_attribute(column, current_time) end end super end def should_record_timestamps? record_timestamps && (!partial_updates? || changed? || (attributes.keys & self.class.serialized_attributes.keys).present?) end def timestamp_attributes_for_update_in_model timestamp_attributes_for_update.select { |c| respond_to?(c) } end def timestamp_attributes_for_update #:nodoc: [:updated_at, :updated_on] end def timestamp_attributes_for_create #:nodoc: [:created_at, :created_on] end def all_timestamp_attributes #:nodoc: timestamp_attributes_for_create + timestamp_attributes_for_update end def current_time_from_proper_timezone #:nodoc: self.class.default_timezone == :utc ? Time.now.utc : Time.now end end end