Checking if Firebase snapshot is equal to nil in Swift

Question

I am trying to query Firebase to check if any user that has waiting: \"1\" and then when the snapshot is returned I want to see whether it is equal to nil. I ha

Answer 1

There are a few things going on here, but the most important one is that you cannot test for the existence of children with .ChildAdded. That makes sense if you think about it: the .ChildAdded event is raised when a child is added to the location. If no child is added, the event won't be raised.

So if you want to test if a child exists at a location, you need to use .Value. Once you do that, there are various way to detect existence. Here's one:

ref.queryOrderedByChild("waiting").queryEqualToValue("1")
   .observeEventType(.Value, withBlock: { snapshot in
       print(snapshot.value)
       if !snapshot.exists() {
           print("test2")
       }
   });