next_status

gistfile1.rb

  def next_status
    next_status = {
                     "pending" => :cancel,
                     "shipped" => :return,
                     "paid"    => :ship
                  }
    if next_status["#{self.status.name}"]
      send(next_status["#{self.status.name}"])
    end
    self.save
  end

What an amazing gist.