How to access instance variable of a class with a module included within a class?

And, this:

 def name 
   name + ", #{catchphrase}"
 end

results in unlimited recursion. name() is the getter, and inside name() you are calling name(). Inside a getter (and setter), you need to access the instance variables directly.

The following works:

require 'rspec/autorun' 

module Presidential
  attr_accessor :name, :age, :citizenship

  def initialize(name, age)
    @name, @age, @citizenship = name, age, self.class.citizenship
  end
end



class UnitedStatesPresident 
  include Presidential

  def self.citizenship
    "The United States of America"
  end
end



class FrancePresident 
  include Presidential

  def name 
   "#{@name}, #{catchphrase}"
  end

  def age
    "#{@age}, #{catchphrase}"
  end

  def citizenship
    "#{self.class.citizenship}, #{catchphrase}"
  end

  def self.citizenship
    "La France"
  end

  def catchphrase
    "bien sur"
  end
end


RSpec.describe FrancePresident do
  describe "catchphrase" do
    it "sounds just right" do
      expect( FrancePresident.citizenship ).to eq("La France")
      sarcozy = FrancePresident.new("Nicolas Sarkozy", 59)
      expect( sarcozy.citizenship ).to eq("La France, bien sur")
      expect( sarcozy.age ).to eq("59, bien sur")
      expect( sarcozy.name ).to eq("Nicolas Sarkozy, bien sur")
    end
  end

  describe "inheritance" do
    it "should not inherit from President" do
      expect( FrancePresident.superclass.to_s ).not_to eq('President')
    end
  end
end

--output:--
$ ruby rspec_regular_ruby_code.rb 

Finished in 0.00159 seconds (files took 0.09554 seconds to load)
4 examples, 0 failures

Change age method to like this,

def age
  "#{@age}, #{catchphrase}"
end