Firebase Firestore global variable for async function

Question

I want to set a global variable equal to some values I am fetching from my firestore database. However, I think that because this is a

Firestore.firestore().collection("users").document(self.id).getDocument { (snapshot, err) in

                if let err = err {
                    print("Error getting documents: \(err)")
                } else{

                    self.nameGlobal = snapshot?.get("name") as! String ?? "failed"
                    self.usernameGlobal = snapshot?.get("username") as! String ?? "failed"

                }

            }

print (self.nameGlobal) print (self.usernameGlobal)

Due to the async nature, the print statements at the end seem to be executed before the Firestore function is finished running. Does anyone know how I could force the function to finish updating the global variables before the subsequent lines are executed? I would really like to be able to access these variables outside of the callback rather than writing all my code inside of the callback.

Put the subsequent lines in the callback itself. Or put them in another function that's called in the callback. — Doug Stevenson, Feb 27 '19 at 19:22
But is there any way to take the variable out of the callback and store it in a global variable? — Computer science, Feb 27 '19 at 20:16
Possible duplicate of [How to return value from Alamofire](https://stackoverflow.com/questions/27390656/how-to-return-value-from-alamofire) — jscs, Feb 27 '19 at 20:26
Possible duplicate of [Swift closure async order of execution](https://stackoverflow.com/questions/39880506/swift-closure-async-order-of-execution) — jscs, Feb 27 '19 at 20:27
You can store it in a global. You just can't use it before the callback completes. — Doug Stevenson, Feb 27 '19 at 20:29
Is there a way to only execute the following lines after the callback completes? — Computer science, Feb 28 '19 at 19:46

Firebase Firestore global variable for async function

0 Answers0