CODEWITHSUNDEEP
swiftfirebase-realtime-databasefirebase-authentication
Tom
Tom

Reputation: 116

unresolved identifier "completion"

I've got some code I've used elsewhere in the project and modified it to fetch user data, however there's an error saying that completion is an unresolved identifier that I'm unable to find the solution to.

I've attempted adding a completion block to the call itself, and read through Firebase documentation to try finding a solution how ever nothing seems to work.

func observeCurrentUser() {
    guard let currentUser = Auth.auth().currentUser else {
        return
    }

    CURRENT_USERS_REF?.child(currentUser.uid).observeSingleEvent(of: .value, with: {
        snapshot in
            if let dict = snapshot.value as? [String: Any] {
                let user = User.transformUser(dict: dict)
                completion(user)
            }
    })
}

Upvotes: 0

Views: 384

Answers (2)

Shehata Gamal
Shehata Gamal

Reputation: 100549

You need to add a trailing closure ( completion ) as your current statement completion(user) shows that you haven't added it

func observeCurrentUser(completion:@escaping((User?) -> ())) {
    guard let currentUser = Auth.auth().currentUser else {
        completion(nil)
        return
    }

    CURRENT_USERS_REF?.child(currentUser.uid).observeSingleEvent(of: .value, with: {
        snapshot in
            if let dict = snapshot.value as? [String: Any] {
                let user = User.transformUser(dict: dict)
                completion(user)
            }
    })
}

Upvotes: 1

Bola Ibrahim
Bola Ibrahim

Reputation: 780

You have to declare the completion as a parameter on your method then specify the dataType of the completion content.

func observeCurrentUser(completion: @escaping (_ user: UserModel )->(Void)) {
    guard let currentUser = Auth.auth().currentUser else {
        return
    }

    CURRENT_USERS_REF?.child(currentUser.uid).observeSingleEvent(of: .value, with: { snapshot in
        if let dict = snapshot.value as? [String: Any] {
            let user = User.transformUser(dict: dict)
            completion(user)
        }
    })
}

Upvotes: 0

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