activerecord/lib/active_record/attribute_methods/time_zone_conversion.rb
# frozen_string_literal: true
require "active_support/core_ext/object/try"
module ActiveRecord
module AttributeMethods
module TimeZoneConversion
class TimeZoneConverter < DelegateClass(Type::Value) # :nodoc:
def self.new(subtype)
self === subtype ? subtype : super
end
def deserialize(value)
convert_time_to_time_zone(super)
end
def cast(value)
return if value.nil?
if value.is_a?(Hash)
set_time_zone_without_conversion(super)
elsif value.respond_to?(:in_time_zone)
begin
super(user_input_in_time_zone(value)) || super
rescue ArgumentError
nil
end
elsif value.respond_to?(:infinite?) && value.infinite?
value
else
map_avoiding_infinite_recursion(super) { |v| cast(v) }
end
end
private
def convert_time_to_time_zone(value)
return if value.nil?
if value.acts_like?(:time)
value.in_time_zone
elsif value.respond_to?(:infinite?) && value.infinite?
value
else
map_avoiding_infinite_recursion(value) { |v| convert_time_to_time_zone(v) }
end
end
def set_time_zone_without_conversion(value)
::Time.zone.local_to_utc(value).try(:in_time_zone) if value
end
def map_avoiding_infinite_recursion(value)
map(value) do |v|
if value.equal?(v)
nil
else
yield(v)
end
end
end
end
extend ActiveSupport::Concern
included do
class_attribute :time_zone_aware_attributes, instance_writer: false, default: false
class_attribute :skip_time_zone_conversion_for_attributes, instance_writer: false, default: []
class_attribute :time_zone_aware_types, instance_writer: false, default: [ :datetime, :time ]
end
module ClassMethods # :nodoc:
private
def hook_attribute_type(name, cast_type)
if create_time_zone_conversion_attribute?(name, cast_type)
cast_type = TimeZoneConverter.new(cast_type)
end
super
end
def create_time_zone_conversion_attribute?(name, cast_type)
enabled_for_column = time_zone_aware_attributes &&
!skip_time_zone_conversion_for_attributes.include?(name.to_sym)
enabled_for_column && time_zone_aware_types.include?(cast_type.type)
end
end
end
end
end