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# frozen_string_literal: true
require "active_support/core_ext/object/try"
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).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
mattr_accessor :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 inherited(subclass)
super
# 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
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
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