How to Make JSON from Array of Struct in Swift 3? - arrays

Question

I have a problem to make a JSON from an array of struct in Swift3. I searched in Stack Overflow, nothing help me (here the screenshot). I have a struct like this:
public struct ProductObject {
var prodID: String
var prodName: String
var prodPrice: String
var imageURL: String
var qty: Int
var stock: String
var weight: String
init(prodID: String, prodName: String, prodPrice: String, imageURL: String, qty: Int, stock: String, weight: String){
self.prodID = prodID
self.prodName = prodName
self.prodPrice = prodPrice
self.imageURL = imageURL
self.qty = qty
self.stock = stock
self.weight = weight
}
}
and the array of that struct:
private var productsArray = [ProductObject]()
When the array is not empty, and then I tried to print it in another class, it shows this in debugger:
[app.cartclass.ProductObject(prodID: "2", prodName: "produk 2", prodPrice: "IDR 1000000", imageURL: "someURL", qty: 1, stock: "11", weight: "200")]
The array is not a valid JSON object. How to make it a valid JSON object? And I wonder whether this part "app.cartclass.ProductObject" is a problem or not to make it a valid JSON object?
edit:
Here's how I serialize into a JSON:
var products = [String:Any]()
for j in 0 ..< cart.numberOfItemsInCart() {
products=["\(j)":cart.getAllProduct(atIndex: j)]
}
if let valid = JSONSerialization.isValidJSONObject(products) {
do {
let jsonproducts = try JSONSerialization.data(withJSONObject: products, options: .prettyPrinted) as! [String:Any]
//print(jsonproducts)
} catch let error as NSError {
print(error)
}
} else {
print("it is not a valid JSON object");
}

Answer 1

If you want to make JSON from custom object then first you need to convert your custom object to Dictionary, so make one function like below in your ProductObject struct.
func convertToDictionary() -> [String : Any] {
let dic: [String: Any] = ["prodID":self.prodID, "prodName":self.prodName, "prodPrice":self.prodPrice, "imageURL":self.imageURL, "qty":qty, "stock":stock, "weight":weight]
return dic
}
Now use this function to generate Array of dictionary from Array of custom object ProductObject.
private var productsArray = [ProductObject]()
let dicArray = productsArray.map { $0.convertToDictionary() }
Here dicArray is made of type [[String:Any]], now you can use JSONSerialization to generate JSON string from this dicArray.
if let data = try? JSONSerialization.data(withJSONObject: dicArray, options: .prettyPrinted) {
let str = String(bytes: data, encoding: .utf8)
print(str)
}