Copying Key / Value Data into Structure - swiftui

Question

I am having trouble loading API exchange rates into the structure instance moneyRate. The data in rates is formatted as key / values [String : Double]. At the end of the URLSession notice that I have copied the date and base currency into moneyRates, but I can't seem to do the same for the exchange rates such as something like moneyRates.rates = rates. I can see the data in rates in the console.
struct MoneyRates {
var date: String
var base: String
var rates: [String: Double]
}
class CurrencyRates: ObservableObject {
var moneyRates = MoneyRates(date: "2020-07-04", base: "usd", rates: ["bzd": 0.0, "cnh": 0.0, "bbd": 0.0, "hkd": 0.0, "bmd": 0.0, "amd": 0.0, "inr": 0.0, "gmd": 0.0, "ang": 0.0, "egp": 0.0, "cdf": 0.0, "bif": 0.0, "lak": 0.0, "cop": 0.0, "cve": 0.0, "gtq": 0.0, "hrk": 0.0])
// retrieve exchange rates for all 150+ countries from internet and save to rateArray
func updateRates(baseCur: String) {
print("doing update")
let baseUrl = "https://cdn.jsdelivr.net/gh/fawazahmed0/currency-api#1/latest/currencies/"
let requestType = ".json"
guard let url = URL(string: baseUrl + baseCur + requestType) else {
print("Invalid URL")
return
}
let request = URLRequest(url: url)
URLSession.shared.dataTask(with: request) { [self] data, response, error in
if let data = data {
do {
let result = try JSONSerialization.jsonObject(with: data) as! [String:Any]
var keys = Array(result.keys)
if let dateIndex = keys.firstIndex(of: "date"),
let date = result[keys[dateIndex]] as? String, keys.count == 2 {
keys.remove(at: dateIndex)
let base = keys.first!
let rates = MoneyRates(date: date, base: base, rates: result[base] as! [String:Double])
moneyRates.date = date
moneyRates.base = base
print(rates) // displays all key / value exchange rates
}
}
} catch {
print(error)
}
}
}.resume()
}
}

Answer 1

On first analysis, I thought that I could set moneyRates.rates = rates.
But when that didn't work, I looked above at how the base and date were being pulled out of result and thought that I could do the same for the exchange rates.
So the solution is moneyRates.rates = result[base] as! [String : Double].
class CurrencyRates: ObservableObject {
var moneyRates = MoneyRates(date: "2020-07-04", base: "usd", rates: ["bzd": 0.0, "cnh": 0.0, "bbd": 0.0, "hkd": 0.0, "bmd": 0.0, "amd": 0.0, "inr": 0.0, "gmd": 0.0, "ang": 0.0, "egp": 0.0, "cdf": 0.0, "bif": 0.0, "lak": 0.0, "cop": 0.0, "cve": 0.0, "gtq": 0.0, "hrk": 0.0])
// retrieve exchange rates for all 150+ countries from internet and save to rateArray
func updateRates(baseCur: String) {
print("doing update")
let baseUrl = "https://cdn.jsdelivr.net/gh/fawazahmed0/currency-api#1/latest/currencies/"
let requestType = ".json"
guard let url = URL(string: baseUrl + baseCur + requestType) else {
print("Invalid URL")
return
}
let request = URLRequest(url: url)
URLSession.shared.dataTask(with: request) { [self] data, response, error in
if let data = data {
do {
let result = try JSONSerialization.jsonObject(with: data) as! [String:Any]
var keys = Array(result.keys)
if let dateIndex = keys.firstIndex(of: "date"),
let date = result[keys[dateIndex]] as? String, keys.count == 2 {
keys.remove(at: dateIndex)
let base = keys.first!
moneyRates.date = date
moneyRates.base = base
moneyRates.rates = result[base] as! [String : Double]
}
}
} catch {
print(error)
}
}
}.resume()
}
}