Making an api request using URLSession.shared.dataTask - ios

Question

I'm making an api request:
var urlRaw = bookSummaryReadsDomainUrl + apiKey;
let url = URL(string: urlRaw.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!)
let task = URLSession.shared.dataTask(with: url!, completionHandler: { (data, response, error) in
if let error = error {
print("Error with fetching book summary reads: \(error)")
return
}
guard let httpResponse = response as? HTTPURLResponse,
(200...299).contains(httpResponse.statusCode) else {
print("Error with the response, unexpected status code: \(response)")
return
}
if let data = data,
let flurryItems = try? JSONDecoder().decode(FlurrySummary.self, from: data) {
completionHandler(flurryItems.rows ?? [])
}
})
task.resume()
to an endpoint that returns the following data
{
"rows": [
{
"dateTime": "2020-07-04 00:00:00.000-07:00",
"event|name": "BookSummaryRead",
"paramName|name": "bookId",
"paramValue|name": "elon-musk",
"count": 12
},
...
]
import Foundation
struct FlurrySummary: Codable {
var rows: [FlurryItem]?
enum CodingKeys: String, CodingKey {
case rows = "rows"
}
}
struct FlurryItem: Codable {
var name: String?
var event: String?
var value: String?
var count: String?
var date: String?
enum CodingKeys: String, CodingKey {
case name = "paramName|name"
case event = "event|name"
case value = "paramValue|name"
case count = "count"
case date = "dateTime"
}
}
For some reason the JSONDecoder.decode part is not working. It's not filling up the flurryItems and flurryItems.rows = nil. What am I doing wrong?

Answer 1

The property count in FlurryItem has to be of type Int.
var count: Int?
You have to catch the Error that are thrown.
do {
if let data = data,
let flurryItems = try JSONDecoder().decode(FlurrySummary.self, from: data) {
completionHandler(flurryItems.rows ?? [])
}
} catch { print(error) }
Also, you don't need the CodingKeys in FlurrySummary since the property name is the same.
struct FlurrySummary: Codable {
var rows: [FlurryItem]?
}
Note: Also, avoid using optional declaration if the property never becomes null.