Symbol Ruby on Rails 5.1.2 Class Symbol < Object activesupport/lib/active_support/core_ext/object/duplicable.rb activesupport/lib/active_support/core_ext/object/json.rb Methods D duplicable? Instance Public methods duplicable?() Link Symbols are not duplicable: :my_symbol.duplicable? # => false :my_symbol.dup # => TypeError: can't dup Symbol Source: show | on GitHub # File activesupport/lib/active_support/core_ext/object/duplicable.rb, line 84 def duplicable? false end