Just how to read data from Firestore with nested struct in DB
with no nested struct it's ok.
struct Info {
let placeOfBirth: String
let year: String
}
struct User {
var userName: String
var email: String?
var info: Info
init?(data: [String: Any]) {
guard let userName = data["userName"] as? String,
let info = //???? I don't know how coding
else {return nil}
self.userName = userName
self.email = data["email"] as? String
self.info = ?????
}
}
// here I'd like to retrieve user.info...
How should be the code in swift to retrieve info.placeOfBirdh or info.year?
ty
Related
I have my user struct with has a dictionary of all their social medias.
struct User: Identifiable {
var id: String { uid }
let uid, email, name, bio, profileImageUrl: String
let numSocials, followers, following: Int
var socials: [String: String]
init(data: [String: Any]) {
self.uid = data["uid"] as? String ?? ""
self.email = data["email"] as? String ?? ""
self.name = data["name"] as? String ?? ""
self.bio = data["bio"] as? String ?? ""
self.profileImageUrl = data["profileImageURL"] as? String ?? ""
self.numSocials = data["numsocials"] as? Int ?? 0
self.followers = data["followers"] as? Int ?? 0
self.following = data["following"] as? Int ?? 0
self.socials = data["socials"] as? [String: String] ?? [:]
}
}
The idea is for socials (the dictionary), to be dynamic, since users can add and remove social medias. Firestore looks like this:
The dictionary is initialized as empty. I have been able to add elements to the dictionary with this function:
private func addToStorage(selectedMedia: String, username: String) -> Bool {
if username == "" {
return false
}
guard let uid = FirebaseManager.shared.auth.currentUser?.uid else {
print("couldnt get uid")
return false
}
FirebaseManager.shared.firestore.collection("users").document(uid).setData([ "socials": [selectedMedia:username] ], merge: true)
print("yoo")
return true
}
However I can't seem to read the firestore map into my swiftui dictionary. I want to do this so that I can do a ForEach loop and list all of them. If the map is empty then the list would be empty too, but I can't figure it out.
Just in case, here is my viewmodel.
class MainViewModel: ObservableObject {
#Published var errorMessage = ""
#Published var user: User?
init() {
DispatchQueue.main.async {
self.isUserCurrentlyLoggedOut = FirebaseManager.shared.auth.currentUser?.uid == nil
}
fetchCurrentUser()
}
func fetchCurrentUser() {
guard let uid = FirebaseManager.shared.auth.currentUser?.uid else {
self.errorMessage = "Could not find firebase uid"
print("FAILED TO FIND UID")
return
}
FirebaseManager.shared.firestore.collection("users").document(uid).getDocument { snapshot, error in
if let error = error {
self.errorMessage = "failed to fetch current user: \(error)"
print("failed to fetch current user: \(error)")
return
}
guard let data = snapshot?.data() else {
print("no data found")
self.errorMessage = "No data found"
return
}
self.user = .init(data: data)
}
}
}
TLDR: I can't figure out how to get my firestore map as a swiftui dictionary. Whenever I try to access my user's dictionary, the following error appears. If I force unwrap it crashes during runtime. I tried to coalesce with "??" but I don't know how to make it be the type it wants.
ForEach(vm.user?.socials.sorted(by: >) ?? [String:String], id: \.key) { key, value in
linkDisplay(social: key, handler: value)
.listRowSeparator(.hidden)
}.onDelete(perform: delete)
error to figure out
Please be patient. I have been looking for answers through SO and elsewhere for a long time. This is all new to me. Thanks in advance.
This is a two part answer; Part 1 addresses the question with a known set of socials (Github, Pinterest, etc). I included that to show how to map a Map to a Codable.
Part 2 is the answer (TL;DR, skip to Part 2) so the social can be mapped to a dictionary for varying socials.
Part 1:
Here's an abbreviated structure that will map the Firestore data to a codable object, including the social map field. It is specific to the 4 social fields listed.
struct SocialsCodable: Codable {
var Github: String
var Pinterest: String
var Soundcloud: String
var TikTok: String
}
struct UserWithMapCodable: Identifiable, Codable {
#DocumentID var id: String?
var socials: SocialsCodable? //socials is a `map` in Firestore
}
and the code to read that data
func readCodableUserWithMap() {
let docRef = self.db.collection("users").document("uid_0")
docRef.getDocument { (document, error) in
if let err = error {
print(err.localizedDescription)
return
}
if let doc = document {
let user = try! doc.data(as: UserWithMapCodable.self)
print(user.socials) //the 4 socials from the SocialsCodable object
}
}
}
Part 2:
This is the answer that treats the socials map field as a dictionary
struct UserWithMapCodable: Identifiable, Codable {
#DocumentID var id: String?
var socials: [String: String]?
}
and then the code to map the Firestore data to the object
func readCodableUserWithMap() {
let docRef = self.db.collection("users").document("uid_0")
docRef.getDocument { (document, error) in
if let err = error {
print(err.localizedDescription)
return
}
if let doc = document {
let user = try! doc.data(as: UserWithMapCodable.self)
if let mappedField = user.socials {
mappedField.forEach { print($0.key, $0.value) }
}
}
}
}
and the output for part 2
TikTok ogotok
Pinterest pintepogo
Github popgit
Soundcloud musssiiiccc
I may also suggest taking the socials out of the user document completely and store it as a separate collection
socials
some_uid
Github: popgit
Pinterest: pintepogo
another_uid
Github: git-er-done
TikTok: dancezone
That's pretty scaleable and allows for some cool queries: which users have TikTok for example.
I am getting an empty array back from firestore. Specifically from the sub model "Coor" inside of "EventModel".
Data Model:
struct EventModel: Identifiable, Codable {
var id: String
var isLive: Bool
var coors: [Coor]
var eventCenterCoor: [Double]
var hostTitle: String
var eventName: String
var eventDescription: String
var isEventPrivate: Bool
var eventGuestsJoined: [String]
var eventEndDate: String
private enum CodingKeys: String, CodingKey {
case id
case isLive
case coors
case eventCenterCoor
case hostTitle
case eventName
case eventDescription
case isEventPrivate
case eventGuestsJoined
case eventEndDate
}
}
struct Coor: Identifiable, Codable {
var id = UUID()
var coorDoubles: [Double]
private enum CodingKeys: String, CodingKey {
case coorDoubles
}
}
Firestore request:
public func getEventData(completion: #escaping (_ eventModel: [EventModel]) -> Void) {
var eventRef: [EventModel] = []
self.isLoading = true
self.loadingMess = "Finding events.."
self.eventsDataCollection.whereField("isLive", isEqualTo: true)
.getDocuments { (document, error) in
if let document = document, error == nil {
for doc in document.documents {
let data = doc.data()
let id = data["id"] as? String ?? ""
let isLive = data["isLive"] as? Bool ?? false
let coors = data["coors"] as? [Coor] ?? []
let eventCenterCoor = data["eventCenterCoor"] as? [Double] ?? []
let hostTitle = data["hostTitle"] as? String ?? ""
let eventName = data["eventName"] as? String ?? ""
let eventDescription = data["eventDescription"] as? String ?? ""
let isEventPrivate = data["isEventPrivate"] as? Bool ?? false
let eventGuestsJoined = data["eventGuestsJoined"] as? [String] ?? []
let eventEndDate = data["eventEndDate"] as? String ?? ""
eventRef.append(EventModel(id: id, isLive: isLive, coors: coors, eventCenterCoor: eventCenterCoor, hostTitle: hostTitle, eventName: eventName, eventDescription: eventDescription, isEventPrivate: isEventPrivate, eventGuestsJoined: eventGuestsJoined, eventEndDate: eventEndDate))
}
completion(eventRef)
} else if error != nil {
print(error ?? "Error getting events where 'isLive' == true")
self.isLoading = false
}
}
}
Here is the firestore data:
Printing "coors" returns an empty array. The empty array is because this line:
let coors = data["coors"] as? [Coor] ?? []
is defaulting to the empty array. This must mean the data type of [Coor] is incorrect?
You are decoding an array called coorsDouble with this line:
let coorsDouble = data["coorsDouble"] as? [Coor] ?? []
If you look at your data structure, each element is made up of this structure:
{ coolDouble: [Double] }
But, in your Coor model, you have this structure:
struct Coor: Identifiable, Codable {
var id = UUID()
var coor: [Double]
private enum CodingKeys: String, CodingKey {
case coor
}
}
In order to decode the Coor, you'd need its structure to match. So, change it to:
struct Coor: Identifiable, Codable {
var id = UUID()
var coorDouble: [Double]
private enum CodingKeys: String, CodingKey {
case coorDouble
}
}
Next, CodingKeys only take effect when using Codable. Right now, you're just trying to cast a dictionary value (of type Any) to Coor, which isn't going to work. In general, I'd say you should use Codable with your entire structure, but if you wanted to avoid it for some reason, you'd need to do this:
//replacing let coorsDouble = data["coorsDouble"] as? [Coor] ?? []
let coorsDoubleArray = data["coorsDouble"] as? [[String:Any]] ?? []
let coorsDouble = coorsDoubleArray.compactMap { item in
guard let doublesArray = item["coorDoubles"] as? [Double] else {
return nil
}
return Coor(coorDoubles: doublesArray)
}
I have a project in swift with Firestore for the database. My firestore dataset of a user looks like this. User details with an array that contains objects.
I have a function that gets the specifick user with all firestore data:
func fetchUser(){
db.collection("users").document(currentUser!.uid)
.getDocument { (snapshot, error ) in
do {
if let document = snapshot {
let id = document.documentID
let firstName = document.get("firstName") as? String ?? ""
let secondName = document.get("secondName") as? String ?? ""
let imageUrl = document.get("imageUrl") as? String ?? ""
let joinedDate = document.get("joinedDate") as? String ?? ""
let coins = document.get("coins") as? Int ?? 0
let challenges = document.get("activeChallenges") as? [Challenge] ?? []
let imageLink = URL(string: imageUrl)
let imageData = try? Data(contentsOf: imageLink!)
let image = UIImage(data: imageData!) as UIImage?
let arrayWithNoOptionals = document.get("activeChallenges").flatMap { $0 }
print("array without opt", arrayWithNoOptionals)
self.user = Account(id: id, firstName: firstName, secondName: secondName, email: "", password: "", profileImage: image ?? UIImage(), joinedDate: joinedDate, coins: coins, activeChallenges: challenges)
}
else {
print("Document does not exist")
}
}
catch {
fatalError()
}
}
}
This is what the user model looks like:
class Account {
var id: String?
var firstName: String?
var secondName: String?
var email: String?
var password: String?
var profileImage: UIImage?
var coins: Int?
var joinedDate: String?
var activeChallenges: [Challenge]?
init(id: String, firstName: String,secondName: String, email: String, password: String, profileImage: UIImage, joinedDate: String, coins: Int, activeChallenges: [Challenge]) {
self.id = id
self.firstName = firstName
self.secondName = secondName
self.email = email
self.password = password
self.profileImage = profileImage
self.joinedDate = joinedDate
self.coins = coins
self.activeChallenges = activeChallenges
}
init() {
}
}
The problem is I don't understand how to map the activeChallenges from firestore to the array of the model. When I try : let challenges = document.get("activeChallenges") as? [Challenge] ?? []
The print contains an empty array, but when i do: let arrayWithNoOptionals = document.get("activeChallenges").flatMap { $0 } print("array without opt", arrayWithNoOptionals)
This is the output of the flatmap:
it returns an optional array
System can not know that activeChallenges is array of Challenge object. So, you need to cast it to key-value type (Dictionary) first, then map it to Challenge object
let challengesDict = document.get("activeChallenges") as? [Dictionary<String: Any>] ?? [[:]]
let challenges = challengesDict.map { challengeDict in
let challenge = Challenge()
challenge.challengeId = challengeDict["challengeId"] as? String
...
return challenge
}
This is the same way that you cast snapshot(document) to Account object
I have a UserModel:
class UserModel {
var uid: String?
var username : String?
var email: String?
var profileImageUrl: String?
var dateOfBirth: String?
var registrationDate: Int?
var isFollowing: Bool?
var accessLevel: Int?
var onlineStatus: Bool?
init(dictionary: [String : Any]) {
uid = dictionary["uid"] as? String
username = dictionary["username"] as? String
email = dictionary["email"] as? String
profileImageUrl = dictionary["profileImageUrl"] as? String
dateOfBirth = dictionary["dateOfBirth"] as? String
registrationDate = dictionary["userRegistrationDate"] as? Int
accessLevel = dictionary["accessLevel"] as? Int
onlineStatus = dictionary["onlineStatus"] as? Bool
}
}
And I also have a value like [12ih12isd89 : True]
I want to change the value "onlineStatus" for the user "12ih12isd89" to True and I thought the right way to do this is updateValue(:forKey:). But my class UserModel does not have updateValue(:forKey:).
How can I use this in my existing model?
Edit:
How I get the data:
func fetchAllUsers (completion: #escaping ([UserModel]) -> Void) {
let dispatchGroup = DispatchGroup()
var model = [UserModel]()
let db = Firestore.firestore()
let docRef = db.collection("users")
dispatchGroup.enter()
docRef.getDocuments { (querySnapshot, err) in
for document in querySnapshot!.documents {
let dic = document.data()
model.append(UserModel(dictionary: dic))
}
dispatchGroup.leave()
}
dispatchGroup.notify(queue: .main) {
completion(model)
}
}
To me it looks like you need to find the right object in the array and update the property
let dict = ["12ih12isd89" : true]
var model = [UserModel]()
if let user = model.first(where: {$0.uid == dict.keys.first!}) {
user.onlineStatus = dict.values.first!
}
Depending on what ["12ih12isd89" : true] really is you might want to change the access from dict.keys.first! that I used
If your value dictionary contains more than one user, you can use a for loop like this:
var model = [UserModel]()
//Some initalization ...
let values = ["12ih12isd89" : true]
for (k, v) in values {
model.filter({$0.uid == k}).first?.onlineStatus = v
}
This is my data in Firestore:
My comment model:
class CommentModel {
var commentText: String?
var commentDate: NSObject?
var uid: String?
var username : String?
var profileImageUrl: String?
init(dictionary: [String: Any]) {
commentText = dictionary["commentText"] as? String
commentDate = dictionary["commentDate"] as? NSObject
uid = dictionary["uid"] as? String
username = dictionary["username"] as? String
profileImageUrl = dictionary["profileImageUrl"] as? String
}
}
My comments dictionary contains all documents of "comments".
XCode gives me the following suggestion, but I am unsure how to use it.
self.comments.sorted { (CommentModel, CommentModel) -> Bool in
}
How can I sort my dictionary by the commentDate?
You need
self.comments.sort { $0.commentDate < $1.commentDate }
make sure comments is declared as var , also cast it as a Date or String
commentDate = dictionary["commentDate"] as? Date
OR
commentDate = dictionary["commentDate"] as? String