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module ActiveRecord
module AttributeMethods
module TimeZoneConversion
class TimeZoneConverter < SimpleDelegator # :nodoc:
def type_cast_from_database(value)
convert_time_to_time_zone(super)
end
def type_cast_from_user(value)
if value.is_a?(Array)
value.map { |v| type_cast_from_user(v) }
elsif value.respond_to?(:in_time_zone)
value.in_time_zone
end
end
def convert_time_to_time_zone(value)
if value.is_a?(Array)
value.map { |v| convert_time_to_time_zone(v) }
elsif value.acts_like?(:time)
value.in_time_zone
else
value
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 = []
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)
time_zone_aware_attributes &&
!self.skip_time_zone_conversion_for_attributes.include?(name.to_sym) &&
(:datetime == cast_type.type)
end
end
end
end
end
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