I can't get it via Spark.runtimeCollection or Spark.metaCollection. What I want to generate guest player's display name using the format guest[some number], like guest4321. The number is generated from the number of players in player collection. Any reason why player collection access is not allowed from cloud code? This seem to complicate things :(

That could work, thanks Gabriel

Thank you for your response Gabriel. I've done this already and it's working fine. The real problem for me is getting the next guest number. Assuming the player collection is accessible from cloud code, I'll just get the number of players in collection and assign it as the new guest number. Now since I can't do that, I need a way to generate guest number, and I think I'll do it with SparkCache and or SparkRedis. I have a few questions if you don't mind:

1. What's the difference in storing data between SparkCache and SparkRedis? Which solution would you recommend? All I need is a simple storage for a single number

2. What do I need to do if I want to get a list of players that matches certain criteria?