Firestore Swift：获取存储在文档中的嵌套地图数量

Question

I have a document with fields structured something like this:

Is there any way to count the number of nested maps? So in this case, I want to show that I have two "elements", JGBQBnFX23Mh5NL4W8f3N1E5Czu1 and JGBQBnFX23Mh5NL4W8f3N1E5Czu1

Right now, I only know how to retrieve everything under "attendees" using

db.collection("Collection")
            .document(eventID)
            .getDocument { doc, err in
                if let err = err {
                    print(err.localizedDescription)
                    return
                }
                let data = doc?.data()
                let attendees = data?["attendees"]
                print(attendees)
            }

But I do not know how to get the total count (of my document IDs)

Keep in mind I will not be able to use arrays in my scenario. Thanks!

Answer 1

It turns out it could be fixed by changing

let attendees = data?["attendees"]

to

let attendees = data?["attendees"] as? Dictionary<String, Any>

and then you could get the total count by doing attendees?.count