Если вы просто хотите увидеть методы, доступные для любого класса, попробуйте это:
CLASS_NAME.methods # list of all methods available
CLASS_NAME.instance_methods # list of all instance methods
CLASS_NAME.public_instance_methods # list of all instance methods which are public
CLASS_NAME.private_instance_methods # list of all instance methods which are private
CLASS_NAME.protected_instance_methods # list of all instance methods which are protected