Methods
A
D
Instance Protected methods
attribute_cast_code(attr_name)

The enhanced read method automatically converts the UTC time stored in the database to the time zone stored in Time.zone.

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb, line 21
def attribute_cast_code(attr_name)
  column = columns_hash[attr_name]

  if create_time_zone_conversion_attribute?(attr_name, column)
    typecast             = "v = #{super}"
    time_zone_conversion = "v.acts_like?(:time) ? v.in_time_zone : v"

    "((#{typecast}) && (#{time_zone_conversion}))"
  else
    super
  end
end
define_method_attribute=(attr_name)

Defined for all datetime and timestamp attributes when time_zone_aware_attributes are enabled. This enhanced write method will automatically convert the time passed to it to the zone stored in Time.zone.

Source: show | on GitHub 

# File activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb, line 36
          def define_method_attribute=(attr_name)
            if create_time_zone_conversion_attribute?(attr_name, columns_hash[attr_name])
              method_body, line = "                def #{attr_name}=(original_time)
                  time = original_time
                  unless time.acts_like?(:time)
                    time = time.is_a?(String) ? Time.zone.parse(time) : time.to_time rescue time
                  end
                  zoned_time   = time && time.in_time_zone rescue nil
                  rounded_time = round_usec(zoned_time)
                  rounded_value = round_usec(read_attribute("#{attr_name}"))
                  if (rounded_value != rounded_time) || (!rounded_value && original_time)
                    write_attribute("#{attr_name}", original_time)
                    #{attr_name}_will_change!
                    @attributes_cache["#{attr_name}"] = zoned_time
                  end
                end
", __LINE__ + 1
              generated_attribute_methods.module_eval(method_body, __FILE__, line)
            else
              super
            end
          end