title: Loop until I get correct user
body: <p>I have users stored in Redis and want to be able to call only certain subsets from a set, if I don't get the correct user back I want to put it back in the set and then try again until I get one of the desired users</p>
  
  <pre><code>@redis = Redis.new
  @randUser = @redis.spop("users")
  
  if @randUser.include?(["user_4", "user_5", "user_6"])
    @redis.sadd("users", @randUser)
    # Run @randUser = @redis.spop("users") again
  else
    $user_username = @redis.hget(@randUser, "username")
    $user_password = @redis.hget(@randUser, "password")
  end
  </code></pre>
  
  <p>I can't quite get the logic right in my head, how else could I approach this please?</p>