保护ruby对象属性不被访问

Question

什么是保护属性的最佳方式？请参阅以下几点：

class Document 

    # no method outside this class can access this directly. If they call document.data, error should be thrown. including in any rendering 
    field sensitive_data 

    # but this method can be accessed by anyone 
    def get_sensitive_data 
    # where I apply the right protection 
    end 

end 

Answer 1

使用protected关键字。

class Document 

    # but this method can be accessed by anyone 
    def get_sensitive_data 
    # where I apply the right protection 
    end 

    protected # or private if you don't want a child class accesses it (Thx @toch) 

    # no method outside this class can access this directly. If they call document.data, error should be thrown. including in any rendering 
    field sensitive_data 


end 

记住，即使这只是隐藏的getter/setter，任何人都可以检索使用send例如值。

Answer 2

无法阻止某人访问该数据。无论您是否想要，元编程都会暴露出班级的所有内部元素。

也就是说，将get_sensitive_data标记为protected或private将至少防止意外调用get_sensitive_data方法。