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module ActiveRecord
# 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
# <tt>ActiveRecord::Base.record_timestamps = false</tt>
#
# Timestamps are in the local timezone by default but you can use UTC by setting
# <tt>ActiveRecord::Base.default_timezone = :utc</tt>
module Timestamp
extend ActiveSupport::DependencyModule
included do
alias_method_chain :create, :timestamps
alias_method_chain :update, :timestamps
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.
# If the save fails because of validation errors, an ActiveRecord::RecordInvalid exception is raised.
# If an attribute name is passed, that attribute is used for the touch instead of the updated_at/on attributes.
#
# Examples:
#
# product.touch # updates updated_at
# product.touch(:designed_at) # updates the designed_at attribute
def touch(attribute = nil)
current_time = current_time_from_proper_timezone
if attribute
write_attribute(attribute, current_time)
else
write_attribute('updated_at', current_time) if respond_to?(:updated_at)
write_attribute('updated_on', current_time) if respond_to?(:updated_on)
end
save!
end
private
def create_with_timestamps #:nodoc:
if record_timestamps
current_time = current_time_from_proper_timezone
write_attribute('created_at', current_time) if respond_to?(:created_at) && created_at.nil?
write_attribute('created_on', current_time) if respond_to?(:created_on) && created_on.nil?
write_attribute('updated_at', current_time) if respond_to?(:updated_at) && updated_at.nil?
write_attribute('updated_on', current_time) if respond_to?(:updated_on) && updated_on.nil?
end
create_without_timestamps
end
def update_with_timestamps(*args) #:nodoc:
if record_timestamps && (!partial_updates? || changed?)
current_time = current_time_from_proper_timezone
write_attribute('updated_at', current_time) if respond_to?(:updated_at)
write_attribute('updated_on', current_time) if respond_to?(:updated_on)
end
update_without_timestamps(*args)
end
def current_time_from_proper_timezone
self.class.default_timezone == :utc ? Time.now.utc : Time.now
end
end
end
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