是否可以在类外部访问受保护的方法-红宝石

Question

class User    
  def say_secret_with_self
    self.secret
  end

  protected

  def secret
    "secret"
  end
end

u = User.new
p u.say_secret_with_self   # => "secret"

I have heard that protected methods can be accessed only by inherited members. But the above is possible in ruby. Is it correct code?

Answer 1

Yes it is correct code. An instance of the class is able to call self methods even if they are protected . protected/private methods are hidden from the outside but not from inside.

Answer 2

the method secret is still protected. you cant call it from outside of your class (or inherited class). but you can call it from say_secret_with_self because it is still in the same class with secret