module ActiveRecord::Timestamp
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¶ ↑
Active Record keeps all the datetime
and time
columns timezone aware. By default, these values are stored in the database
as UTC and converted back to the current Time.zone
when pulled
from the database.
This feature can be turned off completely by setting:
config.active_record.time_zone_aware_attributes = false
You can also specify that only datetime
columns should be
time-zone aware (while time
should not) by setting:
ActiveRecord::Base.time_zone_aware_types = [:datetime]
You can also add database specific timezone aware types. For example, for PostgreSQL:
ActiveRecord::Base.time_zone_aware_types += [:tsrange, :tstzrange]
Finally, you can indicate specific attributes of a model for which time zone conversion should not applied, for instance by setting:
class Topic < ActiveRecord::Base self.skip_time_zone_conversion_for_attributes = [:written_on] end
Private Instance Methods
# File lib/active_record/timestamp.rb, line 91 def _create_record if record_timestamps current_time = current_time_from_proper_timezone all_timestamp_attributes_in_model.each do |column| if !attribute_present?(column) _write_attribute(column, current_time) end end end super end
# File lib/active_record/timestamp.rb, line 105 def _update_record(*args, touch: true, **options) if touch && should_record_timestamps? current_time = current_time_from_proper_timezone timestamp_attributes_for_update_in_model.each do |column| next if will_save_change_to_attribute?(column) _write_attribute(column, current_time) end end super(*args) end
# File lib/active_record/timestamp.rb, line 129 def all_timestamp_attributes_in_model self.class.send(:all_timestamp_attributes_in_model) end
Clear attributes and changed_attributes
# File lib/active_record/timestamp.rb, line 146 def clear_timestamp_attributes all_timestamp_attributes_in_model.each do |attribute_name| self[attribute_name] = nil clear_attribute_changes([attribute_name]) end end
# File lib/active_record/timestamp.rb, line 133 def current_time_from_proper_timezone self.class.send(:current_time_from_proper_timezone) end
# File lib/active_record/timestamp.rb, line 137 def max_updated_column_timestamp(timestamp_names = timestamp_attributes_for_update_in_model) timestamp_names .map { |attr| self[attr] } .compact .map(&:to_time) .max end
# File lib/active_record/timestamp.rb, line 117 def should_record_timestamps? record_timestamps && (!partial_writes? || has_changes_to_save?) end
# File lib/active_record/timestamp.rb, line 121 def timestamp_attributes_for_create_in_model self.class.send(:timestamp_attributes_for_create_in_model) end
# File lib/active_record/timestamp.rb, line 125 def timestamp_attributes_for_update_in_model self.class.send(:timestamp_attributes_for_update_in_model) end