How to decode a model correctly in swift [duplicate] - swift

Question

I am new to swift programming and Xcode and am try to call mysql data from the database to Xcode using Json encoding. I was able to successfully call all the data (array) but when I decide to call only one value(column) say Courses.name I get the "Decoding Error -- Expected to decode Dictionary but found an array instead." How do I work my way around this problem? My goal is to print only courses.name
import UIKit
struct Course: Decodable {
let id: String
let name: String
let member: String
}
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let jsonUrlString = "http://oriri.ng/aapl/service.php"
guard let url = URL(string: jsonUrlString) else
{ return }
URLSession.shared.dataTask(with: url) { (data, response, err) in
guard let data = data else{ return }
do {
let courses = try JSONDecoder().decode(Course.self, from: data)
print(courses.name)
} catch let jsonErr {
print("Error serializing json:", jsonErr)
}
}.resume()
}
}

Answer 1

[{"id":"1","name":"sobande_ibukun","member":"blue"}]
The [] around denotes that it is an array. Decode with the following and it should work:
let courses = try JSONDecoder().decode([Course].self, from: data)
If you are sure that it will always be one course you can do:
print(courses.first!.name)
If there may be many courses you can print every name:
courses.forEach { course in print(course.name) }

Answer 2

Just wanted to add to Fabians response above.
The fix for showing all of them is to have a struct with each of your keys (in the array) like so:
struct Advisor_Info: Decodable {
let advisor_email: String
let advisor_firstname: String
let advisor_lastname: String
let advisor_phonenumber: String
}
Then extract your items from the JSON dictionary string like so:
do {
let decodedResponse = try JSONDecoder().decode([Advisor_Info].self, from: data)
print(decodedResponse as Any)
for each in decodedResponse {
print(each)
print(each.advisor_email)
}
} catch DecodingError.dataCorrupted(let context) {
print(context)
} catch DecodingError.keyNotFound(let key, let context) {
print("Key '\(key)' not found:", context.debugDescription)
print("codingPath:", context.codingPath)
} catch DecodingError.valueNotFound(let value, let context) {
print("Value '\(value)' not found:", context.debugDescription)
print("codingPath:", context.codingPath)
} catch DecodingError.typeMismatch(let type, let context) {
print("Type '\(type)' mismatch:", context.debugDescription)
print("codingPath:", context.codingPath)
} catch {
print("error: ", error)
}
}