Ruby에서 부모의 클래스 이름을 얻는 방법

Ruby에서 부모의 클래스 이름을 얻는 방법

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내가 클래스가 A있고 B어디에 B상속 한다고 가정합시다 A. 부모 클래스 이름을 어떻게 인쇄합니까?B

class A
end

class B < A
end

내가 시도한 몇 가지

>> B.new.class #=> B   #which is correct
>> B.new.parent  #=> Undefined method `parent`
>> B.parent   #=> Object
>> B.parent.class #=> Class

감사 :)

---

class A
end

class B < A
end

B.superclass # => A
B.superclass.name # => "A"

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전체 조상 스택을 원하면 다음을 시도하십시오.

object.class.ancestors

예를 들면 :

> a = Array.new
=> []
> a.class.ancestors
=> [Array, Enumerable, Object, Kernel, BasicObject]

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객체 (Instantiated Class)가 주어지면 부모 클래스를 파생시킬 수 있습니다.

>> x = B.new
>> x.class.superclass.name
=>"A"

---

경우 구글은 레일에서 일하고있어 여기 사람이, 어떤 대신 할 수 있습니다 제공 base_class뿐만 superclass아니라 액티브 상속 구조를 탐색합니다.

class A < ActiveRecord::Base
end

class B < A
end

> A.superclass
=> ActiveRecord::Base
> B.superclass
=> A

> A.base_class
=> A
> B.base_class
=> A

더 나아가 ...

class C < B
end

> C.base_class
=> A

In other words, base_class gives you the top of the inheritance tree but limited to the context of your application. Fair warning though, as far as Rails is concerned "your application" includes any gems you're using, so if you have a model that subclasses something defined in a gem, base_class will return the gem's class, not yours.

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The term you're looking for is superclass. And indeed you can do B.superclass to get A. (You can also do B.ancestors to get a list of all the classes and modules it inherits from — something like [B, A, Object, Kernel, BasicObject].)

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Inheritance is a relation between two classes. Inheritance create a parent child relationship between classes. It is a mechanism for code reuse and to allow independent extensions of the original software via public classes and interfaces.The benefit of inheritance is that classes lower down the hierarchy get the features of those higher up, but can also add specific features of their own.

In Ruby, a class can only inherit from a single other class. (i.e. a class can inherit from a class that inherits from another class which inherits from another class, but a single class can not inherit from many classes at once). The BasicObject class is the parent class of all classes in Ruby. Its methods are therefore available to all objects unless explicitly overridden.

Ruby overcome the single class inheritance at once by using the mixin.

I will try to explain with an example.

module Mux
 def sam
  p "I am an module"
 end
end
class A
  include Mux
end
class B < A
end
class C < B
end
class D < A
end

You can trace by using class_name.superclass.name and do this process unless you found BasicOject in this hierarchy. BasicObject is super class o every classes. lets see suppose we want to see class C hierarchy tree.

 C.superclass
   => B
 B.superclass
  => A
 A.superclass
  => Object
 Object.superclass
  => BasicObject

You can see the whole hierarchy of class C. Point to note using this approach you will not find modules that are included or prepended in the parent classes.

There is another approach to find complete hierarchy including modules. According to Ruby doc ancestors. Returns a list of modules included/prepended in mod (including mod itself).

C.ancestors
 => [C, B, A, Mux, Object, Kernel, BasicObject]

Here, Mux and Kernel are Modules.

http://rubylearning.com/satishtalim/ruby_inheritance.html https://en.wikipedia.org/wiki/Inheritance_(object-oriented_programming)

참고URL : https://stackoverflow.com/questions/14778816/how-do-i-get-the-parents-class-name-in-ruby