iOS - Firestore same data retrieving multiple times-CodePudding

My goal: Retrieve data from firestore and display said data once.

Problem: Same data is retrieving multiple times. If there is 5 rows of data, the array of my model retrieves 5 times. Why is this happening?

Here is my firestore model:

"Users - Investors"
   "currentUser.uid"
      "id": currentUser
      "fullName": fullName,
      "username": username,
      "userLocation": userLocation,
      "birthday": birthday

Here is my model:

struct InvestorModel: Identifiable {
    let id: String
    let fullName: String
    let username: String
    let userLocation: String
    let birthday: Date
}

Here is my vm:

class InvestorProfileViewModel: ObservableObject {
    @Published var investorProfile: [InvestorModel] = []
    
    private var auth = Auth.auth()
    private var store = Firestore.firestore()
    
    func getUserInfo() {
        let currentUser = auth.currentUser?.uid ?? ""
        store.collection("Users - Investors").document(currentUser).addSnapshotListener { snapshot, error in
            guard let data = snapshot?.data(), error == nil else {
                print("NO INVESTOR DATA, TRYING ARTIST DATA")
                return
            }

            DispatchQueue.main.async {
                self.investorProfile = data.map { (dataSnapshot) -> InvestorModel in
                    return InvestorModel(
                        id: currentUser,
                        fullName: data["fullName"] as? String ?? "",
                        username: data["username"] as? String ?? "",
                        userLocation: data["userLocation"] as? String ?? "",
                        birthday: data["birthday"] as? Date ?? Date()
                    )
                }
                print(self.investorProfile)
            }
        }
    }
}

Here is my view:

struct HomeView: View {
    @EnvironmentObject var hvm: HomeViewModel
    @EnvironmentObject var ipvm: InvestorProfileViewModel
    @Environment(\.colorScheme) var colorScheme
    
    let devInvestor = DeveloperPreview.instance.investor
    
    var body: some View {
        ZStack {
            Color.theme.background.ignoresSafeArea(.all)
            VStack {
                ForEach(ipvm.investorProfile) { investor in
                    MenuContent(investor: investor, menuWidth: menuWidth)
                }
            }
            .padding(.vertical, 20)
            .padding(.horizontal, 30)
        }
        .onAppear {
            self.ipvm.getUserInfo()
        }
    }
}

The print call inside of getUserInfo() returns:

[musifi.InvestorModel(id: "F65D7CB4-25B3-47C5-9A26-78C645916AAC", fullName: "John Doe", username: "johnn", userLocation: "Lake Elsinore, CA, USA", birthday: 2021-10-15 00:59:47 0000),

musifi.InvestorModel(id: "2B4AE47A-4C55-4229-AB9F-1F2BA9983B44", fullName: "John Doe", username: "johnn", userLocation: "Lake Elsinore, CA, USA", birthday: 2021-10-15 00:59:47 0000),

musifi.InvestorModel(id: "E8F87591-DC12-4068-958E-D2DA9025C316", fullName: "John Doe", username: "johnn", userLocation: "Lake Elsinore, CA, USA", birthday: 2021-10-15 00:59:47 0000),

musifi.InvestorModel(id: "95C8B099-C753-410E-AF7D-72EDD8FB0E7D", fullName: "John Doe", username: "johnn", userLocation: "Lake Elsinore, CA, USA", birthday: 2021-10-15 00:59:47 0000)]

4 types of data: fullName, username, userLocation, birthday - and 4 times it was called. This number always correlates. I am only calling the function once.

CodePudding user response：

Im still not entirely sure why this works, but it does. Its possible that .map was iterating for every single row. - Please comment any theories so I can better understand, thanks!

    func getInvestorProfile() {
        store.collection("Users - Investors").document(auth.currentUser?.uid ?? "").addSnapshotListener { snapshot, error in
            guard let data = snapshot?.data(), error == nil else {
                print("NO INVESTOR DATA, TRYING ARTIST DATA")
                return
            }

            DispatchQueue.main.async {
                self.investorProfile.append(
                    InvestorModel(id: data["id"] as? String ?? "",
                                  fullName: data["fullName"] as? String ?? "",
                                  username: data["username"] as? String ?? "",
                                  userLocation: data["userLocation"] as? String ?? "",
                                  birthday: data["birthday"] as? Date ?? Date()
                                 )
                )
                print(self.investorProfile)
            }
        }
    }