getting 0 values inside my array from getdocument which insdie getdocuments - ios

Question

iam working with firestore i have two structs
one called history
aother called cart
simply hisory struct is
struct UserOrderHistoryModel {
var id : String? = ""
var dateOrderCreated : String? = ""
var cartArray : [CartItemModel]
}
struct CartItemModel {
var id : String? = ""
var restaurantImageUrl : String
var restaurantTitle : String
var menuItemImageUrl : String
var menuItemTitle : String
var countOfMenuItemSelected : Int
}
what i am trying to do is load history so i use getdocument to get the id and the date
i wanted to get order collection which inside history document
so i use another getdocuments inside the first one
func loadUserOrderHistory(completion : #escaping (_ error :Error? ,_ userHistoryArray : [UserOrderHistoryModel]?) -> ()) {
var historyArray = [UserOrderHistoryModel]()
let userHistoryRef = USERS.document(UserConfigurations.currentUserID!).collection("history")
userHistoryRef.getDocuments { (snapShots, error) in
if error != nil {
completion(error , nil)
}else {
historyArray.removeAll()
for document in snapShots!.documents {
let historyId = document.documentID
let historyData = document.data()
let historyDate = historyData["date_order_created"] as? Timestamp ?? nil
let historyDateToString = String(describing: historyDate?.dateValue())
var orderArray = [CartItemModel]()
self.loadUserHistoryOrders(histroyDocumentReference: userHistoryRef.document(historyId), completion: { (error, cartArray) in
if error != nil {
print(error!)
}else {
orderArray = cartArray!
}
})
let userHistory = UserOrderHistoryModel(id: historyId, dateOrderCreated: historyDateToString , cartArray: self.orderArray)
historyArray.append(userHistory)
}
completion(nil , historyArray)
}
}
}
private func loadUserHistoryOrders( histroyDocumentReference : DocumentReference, completion : #escaping (_ error : Error? ,_ historyOrders : [CartItemModel]? ) -> ()) {
var cartArray = [CartItemModel]()
histroyDocumentReference.collection("orders").getDocuments { (snapShot, error) in
if error != nil {
completion(error,nil)
}else {
for document in snapShot!.documents {
let id = document.documentID
let cartDictionary = document.data()
let restaurantImageUrl = cartDictionary["restaurant_imageurl"] as? String ?? "none"
let restaurantName = cartDictionary["restaurant_title"] as? String ?? "none"
let menuItemImageUrl = cartDictionary["menuItem_imageurl"] as? String ?? "none"
let menuItemName = cartDictionary["menuItem_title"] as? String ?? "none"
let count = cartDictionary["number_of_selected_menuitem"] as? Int ?? 0
let cart = CartItemModel(id: id, restaurantImageUrl: restaurantImageUrl, restaurantTitle: restaurantName, menuItemImageUrl: menuItemImageUrl, menuItemTitle: menuItemName, countOfMenuItemSelected: count)
cartArray.append(cart)
}
completion(nil , cartArray)
}
}
}
so orderArray inside second getdocumnet which i put it inside another function called loadUserHistoryOrders
i debugged the code and found that
once i get to end of the this function orderArray is back to 0 values
here is the pics of my firestore
url of pics : https://drive.google.com/open?id=1NX8NIUN2Yb9m3_7A8EnZgAxWe8xuhNDh
Update :
i solved the problem by adding completion of loadUserOrderHistory inside the call of the second method loadUserHistoryOrders
func loadUserOrderHistory(completion : #escaping (_ error :Error? ,_ userHistoryArray : [UserOrderHistoryModel]?) -> ()) {
var historyArray = [UserOrderHistoryModel]()
let userHistoryRef = USERS.document(UserConfigurations.currentUserID!).collection("history")
userHistoryRef.getDocuments { (snapShots, error) in
if error != nil {
completion(error , nil)
}else {
historyArray.removeAll()
for document in snapShots!.documents {
let historyId = document.documentID
let historyData = document.data()
let historyDate = historyData["date_order_created"] as? Timestamp ?? nil
let historyDateToString = String(describing: historyDate?.dateValue())
var orderArray = [CartItemModel]()
self.loadUserHistoryOrders(histroyDocumentReference: userHistoryRef.document(historyId), completion: { (error, cartArray) in
if error != nil {
print(error!)
}else {
orderArray = cartArray!
let userHistory = UserOrderHistoryModel(id: historyId, dateOrderCreated: historyDateToString , cartArray: self.orderArray)
historyArray.append(userHistory)
completion(nil , historyArray)
}
})
}
}
}
}