Module: Singleton

Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Included In: `::ActionDispatch::ServerTiming::Subscriber`, `::ActiveJob::Serializers::BigDecimalSerializer`, `::ActiveJob::Serializers::DateSerializer`, `::ActiveJob::Serializers::DateTimeSerializer`, `::ActiveJob::Serializers::DurationSerializer`, `::ActiveJob::Serializers::ModuleSerializer`, `::ActiveJob::Serializers::ObjectSerializer`, `::ActiveJob::Serializers::RangeSerializer`, `::ActiveJob::Serializers::SymbolSerializer`, `::ActiveJob::Serializers::TimeObjectSerializer`, `::ActiveJob::Serializers::TimeSerializer`, `::ActiveJob::Serializers::TimeWithZoneSerializer`, `::ActiveModel::NullMutationTracker`, `::Mime::AllType`, `::Mime::NullType`
Defined in:	activesupport/lib/active_support/core_ext/object/duplicable.rb

Instance Attribute Summary

Singleton instances are not duplicable:

Class.new.include(Singleton).instance.dup # TypeError (can't dup instance of singleton

[ GitHub ]

# File 'activesupport/lib/active_support/core_ext/object/duplicable.rb', line 57


def duplicable?
  false
end