Ruby:从内部方法访问attr_accessor方法

I have a code:

我有一个代码:

class A
  attr_accessor :somevar

  def a
    somevar = 'something'
    puts @somevar
  end

  def b
    send :somevar=, 'something'
    puts @somevar
  end

end

A.new.a #=> nil
A.new.b #=> 'something'
class A
  attr_acces