Retrieve data from new Firebase

Question

Please help. After migrating to new Firebase I can\'t retrieve data. Use this construction:

let ref = FIRDatabase.database().reference()

override func viewDidL         


        

Answer 1

So, with mine, I also had a ref being declared immediately when the view controller was instantiated. I had to make it load after the app had been configured in the app delegate with FIRApp.configure().

Before:

let serverRef = Firebase("firebaseURL")

After:

lazy var serverRef = FIRDatabase.database().reference()

This delays the instantiation of the database reference until its needed, which wont be until viewDidLoad on your initial view controller.

Answer 2

In my case I had to change the configure to be called before calling the super applicationDidLaunch:

[FIRApp configure];

[super application:application didFinishLaunchingWithOptions:launchOptions];

Answer 3

I too had a problem with the Firebase Database. Fixed it by adding

import FirebaseDatabase

to my code

Answer 4

To build on the answer given by @ColdLogic, the reason I had this error was because I had my Firebase database reference being created in an init method on a view controller, not in the viewDidLoad method. Since the init methods for all classes that are instantiated when the app launches are called before the application:DidFinishLaunchingWithOptions method in the AppDelegate, it was causing this crash. Moving this line of code:

class MyViewController {

   var firebaseRef: FIRDatabaseReference

   required init?(coder aDecoder: NSCoder) {
      ...
      firebaseRef = FIRDatabase.database().reference()
   }

   override func viewDidLoad() {
      ...
   }
}

to here:

class MyViewController {

   var firebaseRef: FIRDatabaseReference

   required init?(coder aDecoder: NSCoder) {
      ...
   }

   override func viewDidLoad() {
      ...
      self.firebaseRef = FIRDatabase.database().reference()
   }
}

solved the problem for me.

Answer 5

Had the same problem. I looked for linking problems that are related to the plist but that wasn't the problem. I thought maybe it has caused because of that my initial view controller is revoked before the configurations are completed. I solved the problem by experimenting a bit.

My initial view controller was this:

    let ref = FIRDatabase.database().reference()

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

}

I've changed that to this:

    var ref = FIRDatabaseReference.init()

override func viewDidLoad() {
    super.viewDidLoad()
    ref = FIRDatabase.database().reference()

    // Do any additional setup after loading the view, typically from a nib.

}

Crash resolved.

Answer 6

I didn't see this answer yet, I had to add the configure call to the AppDelegate init method. So it looks like:

override init() {
    super.init()
    // Firebase Init
    FIRApp.configure()
}