Array in Array Swift 4 Json - json

Question

["?xml": {
"#encoding" = "utf-8";
"#version" = "1.0";
}, "root": {
"#id" = 1;
date = "11/25/2018";
message = "";
station = (
{
abbr = 24TH;
etd = (
{
abbreviation = ANTC;
destination = Antioch;
estimate = (
{
bikeflag = 1;
color = YELLOW;
delay = 86;
direction = North;
hexcolor = "#ffff33";
length = 10;
minutes = 4;
platform = 2;
},
{
bikeflag = 1;
color = YELLOW;
delay = 0;
direction = North;
hexcolor = "#ffff33";
length = 10;
minutes = 23;
platform = 2;
},
{
bikeflag = 1;
color = YELLOW;
delay = 0;
direction = North;
hexcolor = "#ffff33";
length = 10;
minutes = 43;
platform = 2;
}
);
limited = 0;
},
{
abbreviation = DALY;
destination = "Daly City";
estimate = (
{
bikeflag = 1;
color = BLUE;
delay = 214;
direction = South;
hexcolor = "#0099cc";
length = 9;
minutes = 11;
platform = 1;
},
{
bikeflag = 1;
color = BLUE;
delay = 0;
direction = South;
hexcolor = "#0099cc";
length = 9;
minutes = 27;
platform = 1;
},
{
bikeflag = 1;
color = BLUE;
delay = 0;
direction = South;
hexcolor = "#0099cc";
length = 9;
minutes = 47;
platform = 1;
}
);
limited = 0;
},
{
abbreviation = DUBL;
destination = "Dublin/Pleasanton";
estimate = (
{
bikeflag = 1;
color = BLUE;
delay = 0;
direction = North;
hexcolor = "#0099cc";
length = 9;
minutes = 10;
platform = 2;
},
{
bikeflag = 1;
color = BLUE;
delay = 0;
direction = North;
hexcolor = "#0099cc";
length = 9;
minutes = 30;
platform = 2;
},
{
bikeflag = 1;
color = BLUE;
delay = 0;
direction = North;
hexcolor = "#0099cc";
length = 9;
minutes = 50;
platform = 2;
}
);
limited = 0;
},
{
abbreviation = MLBR;
destination = "SFO/Millbrae";
estimate = (
{
bikeflag = 1;
color = YELLOW;
delay = 245;
direction = South;
hexcolor = "#ffff33";
length = 10;
minutes = 17;
platform = 1;
},
{
bikeflag = 1;
color = YELLOW;
delay = 254;
direction = South;
hexcolor = "#ffff33";
length = 10;
minutes = 38;
platform = 1;
},
{
bikeflag = 1;
color = YELLOW;
delay = 0;
direction = South;
hexcolor = "#ffff33";
length = 10;
minutes = 53;
platform = 1;
}
);
limited = 0;
}
);
name = "24th St. Mission";
}
);
time = "05:28:01 PM PST";
uri = {
"#cdata-section" = "http://api.bart.gov/api/etd.aspx?cmd=etd&orig=24TH&json=y";
};
}]
Want to get abbr, abbreviation, minutes in three separate arrays. So the root is a separate element as in, key1 = xml and key2 = root.
this is what I have. I am getting till estimates array but not able to get the values like I mentioned before.
static func singleRoute(_ station: String?, completionHandler: #escaping (SingleRouteModel?) -> Void) {
let routeURL = URL(string: "http://api.bart.gov/api/etd.aspx?cmd=etd&orig=\(station ?? "12TH")&key=MW9S-E7SL-26DU-VV8V&json=y")
var routeModel = SingleRouteModel()
URLSession.shared.dataTask(with: routeURL!) { (data, response, error) in
if error == nil {
do {
guard let todo = try JSONSerialization.jsonObject(with: data!, options:.mutableContainers)
as? [String: Any] else {
print("error trying to convert data to JSON")
return
}
print("todo = \(todo)")
let root = todo["root"] as? [String: Any]
let station = root?["station"] as? [[String: Any]]
var etd: [[String : Any]]?
var estimate: Any?
for (_, value) in (station?.enumerated())! {
etd = value["etd"] as? [[String: Any]]
}
var estimates: [String: Any]? = [:]
if let etd = etd {
for (key, value) in etd.enumerated() {
estimates?["\(key)"] = value
}
} else {
completionHandler(nil)
}
if let estimate = estimates {
for (k, v) in estimate {
print(v)
}
}
completionHandler(routeModel)
} catch {
print("error trying to convert data to JSON")
return
}
} else {
print("no data")
}
}.resume()
}

Answer 1

Here's the code in Playground form:
import Foundation
import XCPlayground
XCPlaygroundPage.currentPage.needsIndefiniteExecution = true
struct Estimate: Codable {
let minutes: String
}
struct ETD: Codable {
let abbreviation: String
let estimate: [Estimate]
}
struct Station: Codable {
let abbr: String
let etd: [ETD]
}
struct Root: Codable {
let station: [Station]
}
struct SingleRouteModel: Codable {
let root: Root
}
func singleRoute(_ station: String?, completionHandler: #escaping (SingleRouteModel?) -> Void) {
let routeURL = URL(string: "http://api.bart.gov/api/etd.aspx?cmd=etd&orig=\(station ?? "12TH")&key=MW9S-E7SL-26DU-VV8V&json=y")
URLSession.shared.dataTask(with: routeURL!) { (data, response, error) in
if let data = data {
let model = try? JSONDecoder().decode(SingleRouteModel.self, from: data)
completionHandler(model)
}
else {
completionHandler(nil)
}
}.resume()
}
singleRoute(nil, completionHandler: { model in
guard let model = model else { print("failed"); return }
let abbrs = model.root.station
.map { $0.abbr }
let abbreviations = model.root.station
.flatMap { $0.etd }
.flatMap { $0.abbreviation }
let minutes = model.root.station
.flatMap { $0.etd }
.flatMap { $0.estimate }
.map { $0.minutes }
print("abbrs:", abbrs)
print("abbreviations:", abbreviations)
print("minutes:", minutes)
})