attr_accessor and def cannot team up

attr_wtf.rb

class AttrFirst
  attr_reader :age
  attr_accessor :name

  def initialize(age = 0)
    @age = age
  end

  def name
    make_name(5)
  end

  def make_name(num_chars)
    Array.new(num_chars).map { alphabet.sample }.join('')
  end

  def alphabet
    ("a".."z").to_a
  end

end

class AttrLast
  attr_reader :age

  def initialize(age = 0)
    @age = age
  end

  def name
    make_name(5)
  end

  def make_name(num_chars)
    Array.new(num_chars).map { alphabet.sample }.join('')
  end

  def alphabet
    ("a".."z").to_a
  end

  attr_accessor :name
end

f = AttrFirst.new
f.name # => "wiqwn"

l = AttrLast.new
l.name # => nil