How do I query other Firebase Users?

问题

I've updated to the newest Firebase (3.2) but can't figure out how to query other users. I've gotten their FacebookID from the Facebook SDK and want to pull data from Firebase based off of that.

I want to do something like below but need to do it on FIRUser instead.

let climbRef = FIRDatabase.database().reference().child("/climb")
let climbQuery = climbRef.queryOrderedByChild("userId").queryEqualToValue(userId)

来源：https://stackoverflow.com/questions/37449635/how-do-i-query-other-firebase-users