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o use the provider package with ChangeNotifier for state management, Firestore as the database, and follow the MVVM (Model-View-ViewModel) architecture, you can organize your project as follows:

my_flutter_app/
├── lib/
│   ├── main.dart
│   ├── models/
│   │   ├── user_model.dart
│   ├── viewmodels/
│   │   ├── user_viewmodel.dart
│   ├── providers/
│   │   ├── user_provider.dart
│   ├── services/
│   │   ├── user_service.dart
│   └── screens/
│       ├── user_list_screen.dart
│       ├── user_modify_screen.dart
│       ├── user_detail_screen.dart
└── pubspec.yaml

Here's an explanation of the components in this structure:

  • models directory: Contains the data models like UserModel. These models represent the structure of your data but do not include any logic or behavior.

  • viewmodels directory: Contains the view models, such as UserViewModel, which are responsible for preparing and managing the data to be displayed in the UI. They act as intermediaries between the UI (Views) and the data.

  • providers directory: Contains classes like UserProvider, which use the ChangeNotifier package to manage state and notify listeners when data changes. These providers expose data to the UI.

  • services directory: Contains classes like UserService, responsible for interacting with Firestore to fetch, update, and delete user data. These services handle the data layer and communicate with external sources.

  • screens directory: Contains the UI components, including screens like UserListScreen, UserModifyScreen, and UserDetailScreen. These screens use the view models to display data and interact with users.

Using this architecture, the UserViewModel can listen to changes from UserProvider, which is backed by UserService for Firestore interactions. This architecture aligns with the MVVM pattern, separating the concerns of data modeling, view models, and data services, making your codebase organized and maintainable.

user_model.dart

class UserModel {
  final String id;
  String name;
  int age;

  UserModel({
    required this.id,
    required this.name,
    required this.age,
  });
}

user_viewmodel.dart

import 'package:flutter/foundation.dart';
import 'package:your_app_name/models/user_model.dart';
import 'package:your_app_name/providers/user_provider.dart';

class UserViewModel extends ChangeNotifier {
  final UserProvider userProvider;

  UserViewModel(this.userProvider);

  List<UserModel> get users => userProvider.users;

  // Add any view model logic here

  // Example: Create a new user
  void createUser(String name, int age) {
    final newUser = UserModel(
      id: UniqueKey().toString(),
      name: name,
      age: age,
    );
    userProvider.createUser(newUser);
  }

  // Example: Update user information
  void updateUser(String userId, String newName, int newAge) {
    final updatedUser = UserModel(
      id: userId,
      name: newName,
      age: newAge,
    );
    userProvider.updateUser(updatedUser);
  }

  // Example: Delete a user
  void deleteUser(String userId) {
    userProvider.deleteUser(userId);
  }
}

user_provider.dart

import 'package:flutter/foundation.dart';
import 'package:your_app_name/models/user_model.dart';

class UserProvider extends ChangeNotifier {
  final List<UserModel> _users = [];

  List<UserModel> get users => _users;

  // Create a new user
  void createUser(UserModel user) {
    _users.add(user);
    notifyListeners();
  }

  // Read (Retrieve) a user by their ID
  UserModel? readUserById(String id) {
    return _users.firstWhere((user) => user.id == id, orElse: () => null);
  }

  // Update a user's information
  void updateUser(UserModel updatedUser) {
    final index = _users.indexWhere((user) => user.id == updatedUser.id);
    if (index != -1) {
      _users[index] = updatedUser;
      notifyListeners();
    }
  }

  // Delete a user
  void deleteUser(String id) {
    _users.removeWhere((user) => user.id == id);
    notifyListeners();
  }
}

user_service.dart

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:your_app_name/models/user_model.dart';

class UserService {
  final FirebaseFirestore _firestore = FirebaseFirestore.instance;
  final CollectionReference _usersCollection = FirebaseFirestore.instance.collection('users');

  // Fetch user data from Firestore
  Future<List<UserModel>> fetchUsers() async {
    final usersSnapshot = await _usersCollection.get();
    return usersSnapshot.docs.map((doc) {
      final data = doc.data() as Map<String, dynamic>;
      return UserModel(
        id: doc.id,
        name: data['name'] as String,
        age: data['age'] as int,
      );
    }).toList();
  }

  // Create a new user in Firestore
  Future<void> createUser(UserModel user) async {
    await _usersCollection.doc(user.id).set({
      'name': user.name,
      'age': user.age,
    });
  }

  // Update a user's information in Firestore
  Future<void> updateUser(UserModel updatedUser) async {
    await _usersCollection.doc(updatedUser.id).update({
      'name': updatedUser.name,
      'age': updatedUser.age,
    });
  }

  // Delete a user from Firestore
  Future<void> deleteUser(String id) async {
    await _usersCollection.doc(id).delete();
  }
}

Screens


user_list_screen.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:your_app_name/models/user_model.dart';
import 'package:your_app_name/viewmodels/user_viewmodel.dart';

class UserListScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final userViewModel = Provider.of<UserViewModel>(context);

    return Scaffold(
      appBar: AppBar(
        title: Text('User List'),
      ),
      body: ListView.builder(
        itemCount: userViewModel.users.length,
        itemBuilder: (context, index) {
          final user = userViewModel.users[index];
          return ListTile(
            title: Text(user.name),
            subtitle: Text('Age: ${user.age.toString()}'),
            onTap: () {
              // Navigate to the user detail screen when a user is tapped
              Navigator.of(context).push(MaterialPageRoute(
                builder: (context) => UserDetailScreen(userId: user.id),
              ));
            },
          );
        },
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          // Navigate to the user creation screen when the FAB is tapped
          Navigator.of(context).push(MaterialPageRoute(
            builder: (context) => UserModifyScreen(isCreating: true),
          ));
        },
        child: Icon(Icons.add),
      ),
    );
  }
}

user_modify_screen.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:your_app_name/viewmodels/user_viewmodel.dart';

class UserModifyScreen extends StatefulWidget {
  final bool isCreating;
  final String userId;

  UserModifyScreen({required this.isCreating, this.userId = ''});

  @override
  _UserModifyScreenState createState() => _UserModifyScreenState();
}

class _UserModifyScreenState extends State<UserModifyScreen> {
  final TextEditingController nameController = TextEditingController();
  final TextEditingController ageController = TextEditingController();

  @override
  void initState() {
    super.initState();
    if (!widget.isCreating) {
      // Fetch user data if not in create mode
      final userViewModel = Provider.of<UserViewModel>(context, listen: false);
      final user = userViewModel.getUserById(widget.userId);
      if (user != null) {
        nameController.text = user.name;
        ageController.text = user.age.toString();
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.isCreating ? 'Create User' : 'Edit User'),
      ),
      body: Padding(
        padding: EdgeInsets.all(16.0),
        child: Column(
          children: [
            TextField(
              controller: nameController,
              decoration: InputDecoration(labelText: 'Name'),
            ),
            TextField(
              controller: ageController,
              decoration: InputDecoration(labelText: 'Age'),
              keyboardType: TextInputType.number,
            ),
            ElevatedButton(
              onPressed: () {
                // Save or update user when the button is tapped
                final userViewModel = Provider.of<UserViewModel>(context, listen: false);
                if (widget.isCreating) {
                  userViewModel.createUser(nameController.text, int.tryParse(ageController.text) ?? 0);
                } else {
                  userViewModel.updateUser(widget.userId, nameController.text, int.tryParse(ageController.text) ?? 0);
                }
                Navigator.of(context).pop();
              },
              child: Text(widget.isCreating ? 'Create' : 'Save'),
            ),
          ],
        ),
      ),
    );
  }
}

user_detail_screen.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:your_app_name/models/user_model.dart';
import 'package:your_app_name/viewmodels/user_viewmodel.dart';

class UserDetailScreen extends StatelessWidget {
  final String userId;

  UserDetailScreen({required this.userId});

  @override
  Widget build(BuildContext context) {
    final userViewModel = Provider.of<UserViewModel>(context);
    final UserModel? user = userViewModel.readUserById(userId);

    return Scaffold(
      appBar: AppBar(
        title: Text('User Detail'),
      ),
      body: user != null
          ? Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                ListTile(
                  title: Text('Name'),
                  subtitle: Text(user.name),
                ),
                ListTile(
                  title: Text('Age'),
                  subtitle: Text(user.age.toString()),
                ),
              ],
            )
          : Center(
              child: Text('User not found'),
            ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          // Navigate to the user modification screen when the FAB is tapped
          Navigator.of(context).push(MaterialPageRoute(
            builder: (context) => UserModifyScreen(isCreating: false, userId: userId),
          ));
        },
        child: Icon(Icons.edit),
      ),
    );
  }
}


main.dart

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:your_app_name/providers/user_provider.dart';
import 'package:your_app_name/viewmodels/user_viewmodel.dart';
import 'package:your_app_name/screens/user_list_screen.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'User Management App',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: ChangeNotifierProvider(
        create: (context) => UserProvider(),
        child: UserListScreen(),
      ),
    );
  }
}

pubspec.yaml

name: your_app_name
description: A new Flutter application
publish_to: 'none' # Remove this line if you wish to publish to pub.dev
version: 1.0.0 #0+1

environment:
  sdk: '>=2.19.2 <3.0.0'

dependencies:
  flutter:
    sdk: flutter
  flutter_localizations:
    sdk: flutter
# Replace with your specific version
  provider: ^6.0.5
  cloud_firestore: ^4.11.0 


dev_dependencies:
  flutter_test:
    sdk: flutter

flutter:
  uses-material-design: true
  assets:
    # Add any assets you want to include (e.g., images, fonts)
    - assets/
  # Add other configurations as needed