Connection of Realm with SwiftUI App

I created an embeddedObject containing many fields that are present if excel as column headings (which are the key), and values are the values in each row accordingly. A list of these embeddedObjects was then created, having an array of embeddedObject so as to contain each day’s data. The object had a date field where a string was given, and an ObjectId as well as the list of these embeddedObjects. Flexible sync I tried, but in documentation it is mentioned that it requires(prerequisites) non shared MongoDB Atlas cluster running MongoDB 5.0 or greater. Also created an ObservedResults variable to get the results for the frontend. While opening the frontend, I also gave an environment after checking if user is logged in. I have also tried partition based sync, which apparently did not work for this project, although it did for another one.

Here are the files:
RealmDemoApp.Swift:

import SwiftUI
import Realm
import RealmSwift

let realmApp = RealmSwift.App(id: "xxxxxx")

@main
struct RealmDemoApp: SwiftUI.App {
    var body: some Scene {
        WindowGroup {
            if UserDefaults.standard.bool(forKey: "ISUSERLOGGEDIN") == true {
                if let user = realmApp.currentUser {
                    DetailView(model: DemoModel())
                        .environment(\.realmConfiguration, user.configuration(partitionValue: "demo"))
                }
            }
            else {
                LoginView()
            }
        }
    }
}

LoginView.swift:

import SwiftUI
import RealmSwift

struct LoginView: View {
    @State var email: String = ""
    @State var password: String = ""
    @State private var isSecured: Bool = true
    let realm = try! Realm()
    
    var body: some View {
        NavigationView {
            VStack(alignment: .center, spacing: 30) {
                Spacer()
                Text("Login")
                    .font(.largeTitle)
                    .bold()
                    .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                
                VStack(spacing: 20){
                    VStack(alignment: .leading){
                        HStack(){
                            Text("Email")
                                .font(.title)
                                .bold()
                                .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                            Spacer()
                        }
                        TextField("Email", text: $email)
                            .textFieldStyle(.roundedBorder)
                            .border(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                            .cornerRadius(7)
                    }
                    VStack(alignment: .leading){
                        HStack(){
                            Text("Password")
                                .font(.title)
                                .bold()
                                .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                            Spacer()
                        }
                        
                        ZStack(alignment: .trailing, content: {
                            Group {
                                if isSecured {
                                    SecureField("Password", text: $password)
                                        .textFieldStyle(.roundedBorder)
                                        .border(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                                        .cornerRadius(7)
                                }
                                else {
                                    TextField("Password", text: $password)
                                        .textFieldStyle(.roundedBorder)
                                        .border(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                                        .cornerRadius(7)
                                }
                            }
                            Button {
                                isSecured.toggle()
                            } label: {
                                Image(systemName: self.isSecured ? "eye.slash" : "eye")
                                    .accentColor(.gray)
                                    .padding(20)
                            }
                            
                        })
                    }
                    
                    
                    NavigationLink {
                        if UserDefaults.standard.bool(forKey: "ISUSERLOGGEDIN") == true {
                            if let user = realmApp.currentUser {
                                DetailView(model: DemoModel())
                                    .environment(\.realmConfiguration, user.configuration(partitionValue: "pnl"))
                            }
                            else {
                                Text("login view 84th line")
                            }
                        }
                    } label: {
                        Button {
                            if(email.isEmpty && password.isEmpty){
//                                RealmAuthAnonymous()
                                print("enter email and password")
                            }
                            else {
                                RealmAuth(email: email, password: password)
                            }
                        } label: {
                            Text("Sign In")
                        }
                        .cornerRadius(10)
                        .frame(width: UIScreen.main.bounds.width/1.5, height: 50)
                        .background(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                        .onTapGesture {
                            if UserDefaults.standard.bool(forKey: "ISUSERLOGGEDIN") == true {
                                UserDefaults.standard.set(email, forKey: "email")
                                print("email is: \($email)")
                            }
                        }
                    }
                    .navigationBarBackButtonHidden(true)
                    
                    
                    
                    HStack{
                        Button {
                            
                            
                        } label: {
                            Text("Forgot Password")
                                .underline()
                                .font(.caption)
                                .bold()
                                .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                        }
                        
                    }
                    HStack{
                        Text("Don't have an account?")
                            .font(.caption)
                            .bold()
                            .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                        
                        NavigationLink {
                            SignUpView()
                        } label: {
                            Text("Sign Up")
                                .underline()
                                .font(.title2)
                                .bold()
                                .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                        }
                        
                        
                    }
                }
                Text("or")
                    .font(.caption)
                    .bold()
                    .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                
                Spacer()
                
            }
            .padding()
            .edgesIgnoringSafeArea(.all)
            .background(.black)
        }

        
        //    func login(){
        //        Task {
        //            do{
        //                let user = try await app.login(credentials: .anonymous)
        //                username = user.id
        //            } catch {
        //                print("Failed to login: \(error.localizedDescription)")
        //            }
        //        }
        //    }
    }
}

struct LoginView_Previews: PreviewProvider {
    static var previews: some View {
        LoginView()
    }
}

SignUpView.swift:

import SwiftUI

struct SignUpView: View {
    @State var email: String = ""
    @State var password: String = ""
    @State private var isSecured: Bool = true
//    let userDefaults = UserDefaults.standard
    
    var body: some View {
        
        VStack(alignment: .center, spacing: 30) {
            Spacer()
            Text("Sign Up")
                .font(.largeTitle)
                .bold()
                .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
            
            VStack(spacing: 20){
                VStack(alignment: .leading){
                    HStack(){
                        Text("Email")
                            .font(.title)
                            .bold()
                            .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                        Spacer()
                    }
                    TextField("Email", text: $email)
                        .textFieldStyle(.roundedBorder)
                        .border(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                        .cornerRadius(7)
                }
                VStack(alignment: .leading){
                    HStack(){
                        Text("Password")
                            .font(.title)
                            .bold()
                            .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                        Spacer()
                    }
                    ZStack(alignment: .trailing, content: {
                        Group {
                            if isSecured {
                                SecureField("Password", text: $password)
                                    .textFieldStyle(.roundedBorder)
                                    .border(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                                    .cornerRadius(7)
                            }
                            else {
                                TextField("Password", text: $password)
                                    .textFieldStyle(.roundedBorder)
                                    .border(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                                    .cornerRadius(7)
                            }
                        }
                        Button {
                            isSecured.toggle()
                        } label: {
                            Image(systemName: self.isSecured ? "eye.slash" : "eye")
                                .accentColor(.gray)
                                .padding(20)
                        }
                        
                    })
                }
                
                Button {
                    if(email.isEmpty && password.isEmpty){
//                        RealmAuthAnonymous()
                        print("enter email and password")
                    }
                    else {
                        RealmRegister(email: email, password: password)
                    }
                } label: {
                    Text("Sign Up")
                }
                .cornerRadius(10)
                .frame(width: UIScreen.main.bounds.width/1.5, height: 50)
                .background(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
                
            }
            
            Text("or")
                .font(.caption)
                .bold()
                .foregroundColor(Color(.init(srgbRed: 255, green: 215, blue: 0, alpha: 0.9)))
            
            Button {
                //
            } label: {
                Image("google")
                    .clipShape(Circle())
            }
            
            Spacer()
            
        }
        .padding()
        .edgesIgnoringSafeArea(.all)
        .background(.black)
    }
}

struct SignUpView_Previews: PreviewProvider {
    static var previews: some View {
        SignUpView()
    }
}

DetailView.swift:

import SwiftUI
import Realm
import RealmSwift

struct DetailView: View {
    @ObservedRealmObject var model: DemoModel
    
    @State var busy = false
    
    var body: some View {
        ZStack{
            VStack {
                List {
                    Text("entry")
                        .onAppear(){
                            print(model)
                        }
                }
            }
            .padding()
            if busy {
                ProgressView()
            }
        }
        .onChange(of: model) { newValue in
            print("on change: ")
            print(model)
        }
    }
}

struct DetailView_Previews: PreviewProvider {
    static var previews: some View {
        DetailView(model: DemoModel())
    }
}

DemoModel.swift:

import Foundation
import RealmSwift

class DemoModel: Object, ObjectKeyIdentifiable {
    @Persisted(primaryKey: true) var _id: ObjectId?
    @Persisted var SubModel: List<DemoModel_SubModel>
    @Persisted var date: String?
    
    override static func primaryKey() -> String? {
        return "_id"
    }
    
    convenience init(SubModel: List<DemoModel_SubModel>, date: String?) {
        self.init()
        self.SubModel = SubModel
        self.date = date
    }
    
}

DemoModel_SubModel.swift:

import Foundation
import RealmSwift

class DemoModel_SubModel: EmbeddedObject, ObjectKeyIdentifiable {
    @Persisted var field1: Int?
    @Persisted var field2: Int?
    @Persisted var field3: Int?
    @Persisted var field4: Int?
    @Persisted var field5: Int?
    @Persisted var field6: Int?
    @Persisted var field7: Int?
    @Persisted var field8: Int?
    @Persisted var field9: Int?
    @Persisted var field10: Int?
    @Persisted var field11: Int?
    @Persisted var field12: Int?
    @Persisted var field13: Int?
    @Persisted var field14: Int?
    @Persisted var field15: Int?
    @Persisted var field16: Int?
    @Persisted var field17: Int?
    @Persisted var field18: Int?
    @Persisted var field19: Int?
    @Persisted var field20: Int?
    @Persisted var field21: String?
    @Persisted var field22: Int?
    @Persisted var field23: Int?
    @Persisted var field24: Int?
    @Persisted var field25: Int?
    @Persisted var field26: Int?
    @Persisted var field27: Int?
    @Persisted var field28: Int?
    @Persisted var field29: Int?
    @Persisted var field30: Int?
    @Persisted var field31: Int?
    @Persisted var field32: Int?
    
    convenience init(field1: Int?, field2: Int?, field3: Int?, field4: Int?, field5: Int?, field6: Int?, field7: Int?, field8: Int?, field9: Int?, field10: Int?, field11: Int?, field12: Int?, field13: Int?, field14: Int?, field15: Int?, field16: Int?, field17: Int?, field18: Int?, field19: Int?, field20: Int?, field21: String?, field22: Int?, field23: Int?, field24: Int?, field25: Int?, field26: Int?, field27: Int?, field28: Int?, field29: Int?, field30: Int?, field31: Int?, field32: Int?) {
            self.init()
        self.field1 = field1
        self.field2 = field2
        self.field3 = field3
        self.field4 = field4
        self.field5 = field5
        self.field6 = field6
        self.field7 = field7
        self.field8 = field8
        self.field9 = field9
        self.field10 = field10
        self.field11 = field11
        self.field12 = field12
        self.field13 = field13
        self.field14 = field14
        self.field15 = field15
        self.field16 = field16
        self.field17 = field17
        self.field18 = field18
        self.field19 = field19
        self.field20 = field20
        self.field21 = field21
        self.field22 = field22
        self.field23 = field23
        self.field24 = field24
        self.field25 = field25
        self.field26 = field26
        self.field27 = field27
        self.field28 = field28
        self.field29 = field29
        self.field30 = field30
        self.field31 = field31
        self.field32 = field32
        }
    
}

Constants.swift:

import Foundation
import Realm
import RealmSwift

func RealmRegister(email: String, password: String){
    let client = realmApp.emailPasswordAuth
    client.registerUser(email: email, password: password){ (error) in
        guard error == nil else {
            print("Failed to register: \(error!.localizedDescription)")
            return
        }
        print("successfully registered user")
    }
}

func RealmAuth(email: String, password: String){
    realmApp.login(credentials: Credentials.emailPassword(email: email, password: password)) { (result) in
        switch result {
        case .failure(let error):
            print("Login failed: \(error.localizedDescription)")
        case .success(let user):
            UserDefaults.standard.set(true, forKey: "ISUSERLOGGEDIN")
            print("Successfully logged in as user \(user)")
        }
    }
}

func RealmAuthAnonymous() {
    let anonymousCredentials = Credentials.anonymous
    realmApp.login(credentials: anonymousCredentials){ (result) in
        switch result {
        case .failure(let error):
            print("Anonymous Login failed: \(error.localizedDescription)")
        case .success(let user):
            UserDefaults.standard.set(true, forKey: "ISUSERLOGGEDIN")
            print("Successfully anonymously logged in as user \(user)")
        }
    }
}

I have given Database access as read and write to any database, network access as 0.0.0.0/0, defined Rules as readAndWriteAll, generated Schema from data as:

{
  "title": "DemoModel",
  "properties": {
    "SubModel": {
      "bsonType": "array",
      "items": {
        "bsonType": "object",
        "properties": {
          "field1": {
            "bsonType": "int"
          },
          "field10": {
            "bsonType": "int"
          },
          "field11": {
            "bsonType": "int"
          },
          "field12": {
            "bsonType": "int"
          },
          "field13": {
            "bsonType": "int"
          },
          "field14": {
            "bsonType": "int"
          },
          "field15": {
            "bsonType": "int"
          },
          "field16": {
            "bsonType": "int"
          },
          "field17": {
            "bsonType": "int"
          },
          "field18": {
            "bsonType": "int"
          },
          "field19": {
            "bsonType": "int"
          },
          "field2": {
            "bsonType": "int"
          },
          "field20": {
            "bsonType": "int"
          },
          "field21": {
            "bsonType": "string"
          },
          "field22": {
            "bsonType": "int"
          },
          "field23": {
            "bsonType": "int"
          },
          "field24": {
            "bsonType": "int"
          },
          "field25": {
            "bsonType": "int"
          },
          "field26": {
            "bsonType": "int"
          },
          "field27": {
            "bsonType": "int"
          },
          "field28": {
            "bsonType": "int"
          },
          "field29": {
            "bsonType": "int"
          },
          "field3": {
            "bsonType": "int"
          },
          "field30": {
            "bsonType": "int"
          },
          "field31": {
            "bsonType": "int"
          },
          "field32": {
            "bsonType": "int"
          },
          "field4": {
            "bsonType": "int"
          },
          "field5": {
            "bsonType": "int"
          },
          "field6": {
            "bsonType": "int"
          },
          "field7": {
            "bsonType": "int"
          },
          "field8": {
            "bsonType": "int"
          },
          "field9": {
            "bsonType": "int"
          }
        }
      }
    },
    "_id": {
      "bsonType": "objectId"
    },
    "date": {
      "bsonType": "string"
    }
  }
}

DemoModel.swift and DemoModel_SubModel.swift have been replicated as suggested by RealmObjectModels.
I have also enabled Partition-based Device Sync, and the Developer Mode is on.
The database looks like this:

I am getting stuck somewhere still, as the results show this:

This project is at urgent priority, would be appreciative if somebody could help where I am getting it wrong.

Someone from MongoDB team or other developers, please help me out here.