How to save nested data to the Firestore? - swift

Question

I'm new here. An error occurs while writing the nested data to the Firestore. This is my data structure:
struct CartArray: Codable {
var num:Int
var name:String
var price:Double
init (num: Int,name: String,price: Double)
{ self.num = num
self.name = name
self.price = price
}
this is the data recording function:
let db = Firestore.firestore()
var arrayCart: [CartArray] = []
#IBAction func buttonCheckout(_ sender: Any) {
saveData()
}
...
func saveData () {
let menuItems = [arrayCart]
var list_menuItem = [Any]()
for item in menuItems {
do {
let jsonData = try JSONEncoder().encode(item)
let jsonObject = try JSONSerialization.jsonObject(with: jsonData, options: [])
list_menuItem.append(jsonObject)
}
catch {
// handle error
}
}
print(list_menuItem)
let parameters = [
"address": userAddress as Any,
"datetime": Timestamp(date: Date()),
"status": "Заказано",
"user_phone": userPhone as Any,
"username": userName as Any,
"total":cart.total,
"order":list_menuItem
]
db.collection("orders").document().setData(parameters)
{ err in
if let e = err {
print("$-- error save data \(e)")
} else {
print("success!")
}
}
}
this is the converting json of array:
[<__NSArrayI 0x600001f97880>( { name = "\U041f\U0438\U0440\U043e\U0436\U043a\U0438 \U0441 \U043c\U044f\U0441\U043e\U043c"; num = 3; price = 40; },
{ name = "\U041f\U0438\U0446\U0446\U0430 \U0421\U0442\U0430\U043d\U0434\U0430\U0440\U0442"; num = 1; price = 500; } ) ]
When saving occurs in the 'order' field, an 'Nested arrays are not supported' error occurs. Why?

Answer 1

The problem is that in the saveData() you are creating an array of arrays of CartArray.
Replace: let menuItems = [arrayCart]
with: let menuItems = arrayCart