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 the local timezone by default but you can use UTC by setting:
config.active_record.default_timezone = :utc
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 false .
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
# File lib/active_record/timestamp.rb, line 86 86: def all_timestamp_attributes_in_model 87: timestamp_attributes_for_create_in_model + timestamp_attributes_for_update_in_model 88: end
Clear attributes and changed_attributes
# File lib/active_record/timestamp.rb, line 107 107: def clear_timestamp_attributes 108: all_timestamp_attributes_in_model.each do |attribute_name| 109: self[attribute_name] = nil 110: changed_attributes.delete(attribute_name) 111: end 112: end
# File lib/active_record/timestamp.rb, line 74 74: def should_record_timestamps? 75: self.record_timestamps && (!partial_updates? || changed? || (attributes.keys & self.class.serialized_attributes.keys).present?) 76: end
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