How to query StackOverflow for the most recent, unanswered but upvoted, questions tagged "redis"

Redis questions on StackOverflow

#!/usr/bin/env ruby

require 'zlib'
require 'open-uri'
require 'json'


io = Zlib::GzipReader.new(open("http://api.stackoverflow.com/1.0/questions?tagged=redis&sort=votes&min=1"))
obj = JSON.parse(io.read)

questions = obj['questions']
unanswered_questions = questions.reject { |q| q.has_key?('accepted_answer_id') }

unanswered_questions.each do |question|
  puts "#{question['title']} http://stackoverflow.com/questions/#{question['question_id']}"
end