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: # # config.active_record.record_timestamps = false # # Timestamps are in UTC by default but you can use the local timezone by setting: # # config.active_record.default_timezone = :local # # == Time Zone aware attributes # # By default, ActiveRecord::Base keeps all the datetime columns time zone aware by executing following code. # # config.active_record.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 to the current Time.zone # when reading certain attributes then you can do following: # # class Topic < ActiveRecord::Base # self.skip_time_zone_conversion_for_attributes = [:written_on] # end module Timestamp extend ActiveSupport::Concern included do class_attribute :record_timestamps self.record_timestamps = true end def initialize_dup(other) # :nodoc: super clear_timestamp_attributes end private def create_record if self.record_timestamps current_time = current_time_from_proper_timezone all_timestamp_attributes.each do |column| if respond_to?(column) && respond_to?("#{column}=") && self.send(column).nil? write_attribute(column.to_s, current_time) end end end super end def update_record(*args) 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? self.record_timestamps && (!partial_writes? || changed?) end def timestamp_attributes_for_create_in_model timestamp_attributes_for_create.select { |c| self.class.column_names.include?(c.to_s) } end def timestamp_attributes_for_update_in_model timestamp_attributes_for_update.select { |c| self.class.column_names.include?(c.to_s) } end def all_timestamp_attributes_in_model timestamp_attributes_for_create_in_model + timestamp_attributes_for_update_in_model end def timestamp_attributes_for_update [:updated_at, :updated_on] end def timestamp_attributes_for_create [:created_at, :created_on] end def all_timestamp_attributes timestamp_attributes_for_create + timestamp_attributes_for_update end def max_updated_column_timestamp(timestamp_names = timestamp_attributes_for_update) if (timestamps = timestamp_names.map { |attr| self[attr] }.compact).present? timestamps.map { |ts| ts.to_time }.max end end def current_time_from_proper_timezone self.class.default_timezone == :utc ? Time.now.utc : Time.now end # Clear attributes and changed_attributes def clear_timestamp_attributes all_timestamp_attributes_in_model.each do |attribute_name| self[attribute_name] = nil changed_attributes.delete(attribute_name) end end end end