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 # Saves the record with the updated_at/on attributes set to the current time. # Please note that no validation is performed and no callbacks are executed. # If an attribute name is passed, that attribute is updated along with # updated_at/on attributes. # # Examples: # # product.touch # updates updated_at/on # product.touch(:designed_at) # updates the designed_at attribute and updated_at/on def touch(attribute = nil) update_attribute(attribute, current_time_from_proper_timezone) end private def create #:nodoc: if record_timestamps current_time = current_time_from_proper_timezone timestamp_attributes_for_create.each do |column| write_attribute(column.to_s, current_time) if respond_to?(column) && self.send(column).nil? end timestamp_attributes_for_update_in_model.each do |column| write_attribute(column.to_s, current_time) if self.send(column).nil? end end super end def update(*args) #:nodoc: record_update_timestamps if !partial_updates? || changed? super end def record_update_timestamps #:nodoc: return unless record_timestamps current_time = current_time_from_proper_timezone timestamp_attributes_for_update_in_model.inject({}) do |hash, column| hash[column.to_s] = write_attribute(column.to_s, current_time) hash end end def timestamp_attributes_for_update_in_model #:nodoc: timestamp_attributes_for_update.select { |elem| respond_to?(elem) } 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_update + timestamp_attributes_for_create end def current_time_from_proper_timezone #:nodoc: self.class.default_timezone == :utc ? Time.now.utc : Time.now end end end