Swift - Firebase add multiple value with same key

Question

I am trying to collect the OneSignalIDs of the users. The following code adds one playerID for each user. When the same user logs in with a different device, the playerID is updated.

    let status : OSPermissionSubscriptionState = OneSignal.getPermissionSubscriptionState()
    let oneSignalUser = status.subscriptionStatus.userId

    if oneSignalUser != nil {
        let aUser = Auth.auth().currentUser!

        let post = ["playerID": oneSignalUser!] as [String: Any]
        Database.database().reference().child("usersToOneSignal").child(aUser.uid).setValue(post)
    }

I want every user to be added to every device. So I want more than one playerID under the key "kwvZPH......" (this is FireBase UserKey). How can I do this?

Use updateChildValues() as shown in documentation :=)

matiastofteby
– matiastofteby

2017-09-26 09:00:30 +00:00
Commented Sep 26, 2017 at 9:00 — matiastofteby
– matiastofteby, Commented Sep 26, 2017 at 9:00

Bradley Mackey · Accepted Answer · 2017-09-26 10:49:20Z

2

You can achieve what you want by saving the OneSignal ID as the key instead of the value. Then the playerID won't be overridden on login to a new device. The value doesn't matter, as long as it exists (I will set it to true).

let status : OSPermissionSubscriptionState = OneSignal.getPermissionSubscriptionState()
let oneSignalUserID = status.subscriptionStatus.userId

if oneSignalUser != nil {
    let aUser = Auth.auth().currentUser!

    // get the original path you were using
    let originalPath = Database.database().reference().child("usersToOneSignal").child(aUser.uid)
    // set `true` at the OneSignal key in the database
    originalPath.child(oneSignalUserID!).setValue(true)
}

Will give a database:

- usersToOneSignal
     |
     | - kwzphiusgdfoiaudbksdhf763truygi
       |
       | - 4e762345-76654afedc-65342287fc-57635472: true
       | - 7645736-efcab873465-7635476823f-ab62354: true

Obviously you will need to change how you retrieve the values.

answered Sep 26, 2017 at 10:49

Bradley Mackey

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1 Comment

Zebedee Over a year ago

Thank you. I tried to create a ChildKey from the UIDevice...uuidstring. But your method is much more useful.

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