require 'active_support/core_ext/string/strip' module ActiveRecord module AttributeMethods module TimeZoneConversion class TimeZoneConverter < DelegateClass(Type::Value) # :nodoc: 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 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.is_a?(::Float) 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).in_time_zone 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 mattr_accessor :time_zone_aware_attributes, instance_writer: false self.time_zone_aware_attributes = false class_attribute :skip_time_zone_conversion_for_attributes, instance_writer: false self.skip_time_zone_conversion_for_attributes = [] class_attribute :time_zone_aware_types, instance_writer: false self.time_zone_aware_types = [:datetime, :not_explicitly_configured] end module ClassMethods private def inherited(subclass) # We need to apply this decorator here, rather than on module inclusion. The closure # created by the matcher would otherwise evaluate for `ActiveRecord::Base`, not the # sub class being decorated. As such, changes to `time_zone_aware_attributes`, or # `skip_time_zone_conversion_for_attributes` would not be picked up. subclass.class_eval do matcher = ->(name, type) { create_time_zone_conversion_attribute?(name, type) } decorate_matching_attribute_types(matcher, :_time_zone_conversion) do |type| TimeZoneConverter.new(type) end end super end def create_time_zone_conversion_attribute?(name, cast_type) enabled_for_column = time_zone_aware_attributes && !self.skip_time_zone_conversion_for_attributes.include?(name.to_sym) result = enabled_for_column && time_zone_aware_types.include?(cast_type.type) if enabled_for_column && !result && cast_type.type == :time && time_zone_aware_types.include?(:not_explicitly_configured) ActiveSupport::Deprecation.warn(<<-MESSAGE.strip_heredoc) Time columns will become time zone aware in Rails 5.1. This still causes `String`s to be parsed as if they were in `Time.zone`, and `Time`s to be converted to `Time.zone`. To keep the old behavior, you must add the following to your initializer: config.active_record.time_zone_aware_types = [:datetime] To silence this deprecation warning, add the following: config.active_record.time_zone_aware_types = [:datetime, :time] MESSAGE end result end end end end end