Why this happen?

foo.rb

#!/usr/bin/env ruby

require 'ap'

class Updates

  attr_reader :parsed, :raw

  def initialize( )
    unless Updates.has_output?
      Updates::get_output
      puts 'pop'
      ap @parsed
    end
    @parsed
  end

  def self.has_output?
    return ! @parsed.nil?
  end

  def self.get_output
    @parsed = 'cake'
  end
end

foo = Updates.new

ap foo

gistfile1.txt

[kali:~]% ruby foo.rb
pop
nil
#<Updates:0x007fd911039188>