Ruby-从子对象调用方法

Question

I'm new to Ruby and trying to determine how I can call a class from a child object. Something like the below; however when I try it, I get an error saying "undefined local variable or method `me'"

class my_object < Object
    attr_accessor :me

    def initialize(attributes ={})
    end


    def setvalue(passed_value)
      @passed_value = passed_value.to_s
    end 

    def search(passed_value) 
      @passed_value.include?(passed_value)
    end

   end

   def getMe
    me_too = my_object.new
    me_too.me = "test"
    me_too.me.search("test")

   end
end

Answer 1

instance.class

给你参考课

Answer 2

This works: But your code had multiple errors.

class MY
    attr_accessor :me

    def initialize(attributes ={})
    end


    def setvalue(passed_value)
      passed_value = passed_value.to_s
    end

    def search(passed_value)
      passed_value.include?(passed_value)
    end


   def getMe
    me_too = MY.new
    me_too.me = "test"
    me_too.search("test")

   end
end

my = MY.new
my.getMe

Answer 3

• You don't need to explicity extend Object, everything extends Object in ruby.

• Your class name needs to start with a capital letter.

  class MyObject attr_accessor :me

  end

  me_too = MyObject.new me_too.me = "test"

in console

me_too => #<MyObject:0x106b2e420 @me="test"> 

Check out some introductory ruby tutorials maybe http://ruby.learncodethehardway.org/