I have problem with two of my functions. First the class where problem occurs:
import Foundation
import Firebase
import FirebaseStorage
import SwiftUI
import UIKit
class HomeViewModel: ObservableObject {
@Published var allProfiles = [ProfileLookup]()
@Published var currentProfile: ProfileLookup?
private var allUsersUIDs = [String]()
public let firebaseStorageManager = FirebaseStorageManager()
public let firestoreManager = FirestoreManager()
@Published var session = SessionStore()
init(forPreviews: Bool) {
self.currentProfile = ProfileLookup(profile: Profile(id: "69", firstName: "firstName", lastName: "lastName", birthDate: Date(), age: 18, country: "country", city: "city", language: "language", preference: "preference", gender: "gender", bio: "bio", email: "email", photosURLs: [], profilePictureURL: nil), profileImageViews: [PictureView(id: "1", uiImageView: UIImageView(image: UIImage(named: "blank-profile-hi"))), PictureView(id: "2", uiImageView: UIImageView(image: UIImage(named: "blank-profile-hi"))), PictureView(id: "3", uiImageView: UIImageView(image: UIImage(named: "blank-profile-hi")))])
}
init() {
print("CAME TO INIT")
self.fetchData()
}
func fetchData() {
if (session.currentUser != nil) {
print("STARTING FETCHING")
getAllUserUIDsOfSamePreference()
print("DISPLAYING USERS IN FETCH: \(allUsersUIDs)")
for userUID in allUsersUIDs {
print("USER UID: \(userUID)")
firestoreManager.getDatabase().collection("profiles").document(userUID).getDocument { (document, error) in
if let document = document {
let firstName = document.get("firstName") as? String ?? ""
let lastName = document.get("lastName") as? String ?? ""
let birthDate = document.get("birthDate") as? Date ?? Date()
let age = document.get("age") as? Int ?? 0
let country = document.get("country") as? String ?? ""
let city = document.get("city") as? String ?? ""
let language = document.get("language") as? String ?? ""
let preference = document.get("preference") as? String ?? ""
let gender = document.get("gender") as? String ?? ""
let bio = document.get("bio") as? String ?? ""
let photosURLs = document.get("userPhotosURLs") as? [String] ?? nil
if photosURLs != nil {
self.currentProfile = ProfileLookup(profile: Profile(id: self.session.currentUser!.uid, firstName: firstName, lastName: lastName, birthDate: birthDate, age: age, country: country, city: city, language: language, preference: preference, gender: gender, bio: bio, email: self.session.currentUser!.email!, photosURLs: photosURLs!, profilePictureURL: nil), profileImageViews: [PictureView]())
print("THERE ARE PHOTOS")
} else {
self.currentProfile = ProfileLookup(profile: Profile(id: self.session.currentUser!.uid, firstName: firstName, lastName: lastName, birthDate: birthDate, age: age, country: country, city: city, language: language, preference: preference, gender: gender, bio: bio, email: self.session.currentUser!.email!, photosURLs: nil, profilePictureURL: nil), profileImageViews: [PictureView]())
print("THERE ARE NO PHOTOS")
}
}
self.fetchPhotos(userUID: userUID)
self.allProfiles.append(self.currentProfile!)
}
}
if allProfiles.count != 0 {
self.currentProfile = allProfiles[0]
print("THERE ARE PROFILES IN ARRAY")
} else {
self.currentProfile = ProfileLookup(profile: Profile(id: "69", firstName: "firstName", lastName: "lastName", birthDate: Date(), age: 18, country: "country", city: "city", language: "language", preference: "preference", gender: "gender", bio: "bio", email: "email", photosURLs: [], profilePictureURL: nil), profileImageViews: [PictureView(id: "1", uiImageView: UIImageView(image: UIImage(named: "blank-profile-hi"))), PictureView(id: "2", uiImageView: UIImageView(image: UIImage(named: "blank-profile-hi"))), PictureView(id: "3", uiImageView: UIImageView(image: UIImage(named: "blank-profile-hi")))])
print("THERE ARE NO PROFILES IN ARRAY")
}
}
}
func fetchPhotos(userUID: String) {
if (session.currentUser != nil) {
print("STARTING DOWNLOADING PHOTOS")
let newUserPhotos = self.downloadUserPhotos()
if newUserPhotos.count != 0 {
self.currentProfile?.profileImageViews.removeAll()
self.currentProfile?.profileImageViews = [PictureView]()
for (newUserPhoto, photoURL) in zip(newUserPhotos, (self.currentProfile!.profile.photosURLs)!) {
self.currentProfile?.profileImageViews.append(PictureView(id: photoURL, uiImageView: newUserPhoto))
}
}
}
}
func getAllUserUIDsOfSamePreference() {
self.allUsersUIDs.removeAll()
let loggedUserGender = firestoreManager.getLoggedUserGender()
let loggedUserPreference = firestoreManager.getLoggedUserPreference()
print("STARTING DOWNLOADING USERS")
firestoreManager.getDatabase().collection("profiles").getDocuments { [self] (querySnapshot, error) in
if let querySnapshot = querySnapshot {
print("I'M HERE")
for document in querySnapshot.documents {
let foundUserPreference = document.get("preference") as! String
let foundUserGender = document.get("gender") as! String
let foundUserUID = document.get("id") as! String
if foundUserUID != session.currentUser!.uid {
if foundUserPreference == "Both" {
if loggedUserPreference == "Both" {
self.allUsersUIDs.append(foundUserUID)
} else {
if loggedUserPreference == foundUserGender {
self.allUsersUIDs.append(foundUserUID)
}
}
} else {
if loggedUserPreference == "Both" {
if foundUserPreference == loggedUserGender {
self.allUsersUIDs.append(foundUserUID)
}
} else {
if foundUserPreference == loggedUserGender && loggedUserPreference == foundUserGender {
self.allUsersUIDs.append(foundUserUID)
}
}
}
}
}
print("DISPLAYING USERS IN getAllUsers METHOD: \(allUsersUIDs)")
}
}
}
func downloadUserPhotos() -> [UIImageView] {
var userImages: [UIImageView] = [UIImageView]()
if self.currentProfile?.profile.photosURLs != nil {
for photoURLIndex in 0..<(self.currentProfile?.profile.photosURLs?.count)! {
userImages.append(self.firebaseStorageManager.downloadImageFromStorage(userID: session.currentUser!.uid, userPhotoURL: (self.currentProfile?.profile.photosURLs![photoURLIndex])!))
}
}
return userImages
}
}
Now the problem: I am initializing it in one of my views. Upon initialization I want fetchData() method to be executed. However at the beginning of this function the getAllUserUIDsOfSamePreference() should be executed. What happens however is that (console output):
[...]
CAME TO INIT
STARTING FETCHING
STARTING DOWNLOADING USERS
DISPLAYING USERS IN FETCH: []
THERE ARE NO PROFILES IN ARRAY
[...]
I'M HERE
DISPLAYING USERS IN getAllUsers METHOD: ["fNRVkCjVCTa7uQGz57vP4KUahd12"]
The fetchData() method executes fully and after that getAllUserUIDsOfSamePreference() goes into action which does not allow profile to be fully properly fetched. I believe this problem is connected with concurrency however I do not know how to solve it.
