struct DemoModel: Codable, Equatable {
	let id: UUID
	var title: String
	var subtitle: String
	var imageURL: URL

	init(id: UUID = UUID(), title: String, subtitle: String, imageURL: URL) {
		self.id	= id
		self.title = title
		self.subtitle = subtitle
		self.imageURL = imageURL
	}
}

let baseURL = URL(string: "https://networkhandlertestbase.firebaseio.com/DemoAndTests")!
let getURL = baseURL.appendingPathExtension("json")

URLSession.shared.dataTask(with: getURL) { (data, response, error) in
	if let response = response as? HTTPURLResponse {
		if response.statusCode != 200 {
			// probably throw an error here
			print("Received a non 200 http response: \(response.statusCode) in \(#file) line: \(#line)")
			return
		}
	} else {
		// probably throw an error here
		print("Did not receive a proper response code in \(#file) line: \(#line)")
		return
	}

	if let error = error {
		print("There was an error fetching your data: \(error)")
		return
	}

	guard let data = data else {
		// again, probably throw an error here if the data doesn't exist
		return
	}

	do {
		let firebaseResults = try JSONDecoder().decode([String: DemoModel].self, from: data)
		let models = Array(firebaseResults.values).sorted { $0.title < $1.title }
		// do something with your successful result!
		print(models)
	} catch {
		let nullData = "null".data(using: .utf8)
		if data == nullData {
			// there was no actual error, Firebase just returns "null" if there is a request it can't provide data for.
			let models = [DemoModel]()
			// do something with your empty array result!
			print(models)
			return
		}
		// there was an error decoding your data
		[print]("Error loading demo models: \(error)")
	}
}.resume() //and I bet you always forget this! (I know do!)

// can only input URLRequests, but an extension is provided for ease of use
let request = getURL.request
NetworkHandler.default.transferMahCodableDatas(with: request) { (result: Result<[String: DemoModel], NetworkError>) in
	do {
		let firebaseResults = try result.get()
		let models = Array(firebaseResults.values).sorted { $0.title < $1.title }
		// do something with your successful result!
		print(models)
	} catch NetworkError.dataWasNull {
		// there was no actual error, Firebase just returns "null" if there is a request it can't provide data for.
		let models = [DemoModel]()
		// do something with your empty array result!
		print(models)
	} catch {
		print("Error loading demo models: \(error)")
	}
}