vendor/rails/activerecord/lib/active_record/timestamp.rb

   1 module ActiveRecord
   2   # Active Record automatically timestamps create and update operations if the table has fields
   3   # named created_at/created_on or updated_at/updated_on.
   4   #
   5   # Timestamping can be turned off by setting
   6   #   <tt>ActiveRecord::Base.record_timestamps = false</tt>
   7   #
   8   # Timestamps are in the local timezone by default but you can use UTC by setting
   9   #   <tt>ActiveRecord::Base.default_timezone = :utc</tt>
  10   module Timestamp
  11     def self.included(base) #:nodoc:
  12       base.alias_method_chain :create, :timestamps
  13       base.alias_method_chain :update, :timestamps
  14
  15       base.class_inheritable_accessor :record_timestamps, :instance_writer => false
  16       base.record_timestamps = true
  17     end
  18
  19     private
  20       def create_with_timestamps #:nodoc:
  21         if record_timestamps
  22           t = self.class.default_timezone == :utc ? Time.now.utc : Time.now
  23           write_attribute('created_at', t) if respond_to?(:created_at) && created_at.nil?
  24           write_attribute('created_on', t) if respond_to?(:created_on) && created_on.nil?
  25
  26           write_attribute('updated_at', t) if respond_to?(:updated_at)
  27           write_attribute('updated_on', t) if respond_to?(:updated_on)
  28         end
  29         create_without_timestamps
  30       end
  31
  32       def update_with_timestamps(*args) #:nodoc:
  33         if record_timestamps && (!partial_updates? || changed?)
  34           t = self.class.default_timezone == :utc ? Time.now.utc : Time.now
  35           write_attribute('updated_at', t) if respond_to?(:updated_at)
  36           write_attribute('updated_on', t) if respond_to?(:updated_on)
  37         end
  38         update_without_timestamps(*args)
  39       end
  40   end
  41 end