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module ActiveRecord
# = Active Record Timestamp
#
# Active Record automatically timestamps create and update operations if the
# table has fields named <tt>created_at/created_on</tt> or
# <tt>updated_at/updated_on</tt>.
#
# 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 <tt>false</tt> .
#
# 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|
column = column.to_s
if has_attribute?(column) && !attribute_present?(column)
write_attribute(column, 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)
timestamp_names
.map { |attr| self[attr] }
.compact
.map(&:to_time)
.max
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
clear_attribute_changes([attribute_name])
end
end
end
end
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