如何通过查看 UID 在 Firestore 数据库中设置新字段

Question

I'm trying to add a profilePicturePath to a firebase database record, but I can't seem to add it to an existing record in the database.

my current code is

let db = Firestore.firestore();
            
db.collection("users").document(user?.uid ?? "").setData(["profilePictureURL" : uploadRef.fullPath])

The user id stored locally is a field in the firebase record.

the profilePicutreURL does not exist as a field in the firebase record at the point im trying to insert. (not even sure if that matters)

in sudocode id imagine its something like

database.getCollection("Users").getRecordWithFieldValue("uid" : "localUserObject.uid").setField("profilePicture" : uploadRef.fullPath"

Really sorry if this is a stupid question, very new to IOS and firebase.

any help or guidance on this problem, or any of my other shoddy code would be greatly appreciated

Answer 1

This is how I would do it

guard let uid = Auth.auth().currentUser?.uid else { return }

let db = Firestore.firestore()
let userRef = db.collection("users").document(uid)

userRef.setData(["profilePictureURL" : uploadRef.fullPath])

Answer 2

Ok, so you need to use something like this. First a query will return an optional QuerySnapshot which you need to get the docs from and iterate through them to get the ID. There should only be one UID but I don't know how you set this up. From there you have a docID which you can use within a DocumentReference using the updateData method not setData.

 func getUserDocIDWith(uid: String, completion: @escaping (String) -> ()) {
        DispatchQueue.global(qos: .userInitiated).async {
            let usersRef = db.collection("users").whereField("uid", isEqualTo: uid)
        
        usersRef.getDocuments { (snapshot, error) in
            if error != nil {
                print("Error: \(error!.localizedDescription)")
            } else {
                let docs = snapshot!.documents
                for each in docs {
                    completion(each.documentID)
                }
            }
        }
    }
}

func updateUserWith(path: String) {
    let db = Firestore.firestore()
    guard let uid = Auth.auth().currentUser?.uid else { return }
    
    getUserDocIDWith(uid: uid) { docID in
        let usersRef = db.collection("users").document(docID)
        usersRef.updateData(["profilePictureURL" : path])
    }
}

updateUserWith(path: uploadRef.fullPath)