从简单ruby中的Person实例中获取孙子实例

class Person
  attr_accessor :name, :age, :children

  def initialize(name, age)
    @name = name
    @age = age
    @children = []
  end

  def add_child(child)
    @children << child
  end
end

person1 = Person.new("John", 50)
person2 = Person.new("Mike", 30)
person3 = Person.new("Tom", 10)
person4 = Person.new("Sam", 5)

person1.add_child(person2)
person2.add_child(person3)
person3.add_child(person4)

def get_grandchildren(person)
  grandchildren = []

  person.children.each do |child|
    grandchildren += child.children
  end

  grandchildren
end

grandchildren = get_grandchildren(person1)