Value of type 'NSObject' has no member 'data' -- custom objects

[AFRUITPIE]

snippets-ios/firestore/swift/firestore-smoketest/ViewController.swift

Lines 755 to 773 in 6057cc7

	let docRef = db.collection("cities").document("BJ")
	docRef.getDocument { (document, error) in
	let result = Result {
	try document.flatMap {
	try $0.data(as: City.self)
	}
	}
	switch result {
	case .success(let city):
	if let city = city {
	print("City: \(city)")
	} else {
	print("Document does not exist")
	}
	case .failure(let error):
	print("Error decoding city: \(error)")
	}
	}

System information (OS, Device, etc): macOS 10.15.3, Xcode 11.3.1

What steps will reproduce the problem:

1. Use the snippet in a Firestore project

What is the expected result?
The snippet will cast the Firestore document to the given type

What happens instead of that?
Error: "Value of type 'NSObject' has no member 'data'

Code, logs, or screenshot that illustrate the problem:

[AFRUITPIE]

Apologies, this is not actually an issue. Found the solution here: https://stackoverflow.com/questions/59548819/firebase-cloud-firestore-how-to-convert-document-to-a-custom-object-in-swift