How to find private singleton methods
In Ruby 1.9+, you can simply do:
Vehicle.singleton_class.private_instance_methods(false)#=> [:background]In Ruby 1.8, things are a bit more complicated.
Vehicle.private_methods#=> [:background, :included, :extended, :method_added, :method_removed, ...]will return all private methods. You can filter most of the ones declared outside by doing
Vehicle.private_methods - Module.private_methods#=> [:background, :append_features, :extend_object, :module_function]but that doesn't get quite all of them out, you have to create a module to do that
Vehicle.private_methods - Module.new.private_methods#=> [:background]This last one has the unfortunate requirement of creating a module only to throw it away.