Firebase CRUD with Logging - Dart Package

#This package provides a set of reusable mixins for performing Firestore operations and authentication checks in a clean, modular way. The mixins are designed to follow the SOLID principles, giving developers the flexibility to choose only the functionality they need.

Features Firestore Read Operations: Fetch individual documents or retrieve all documents from a collection. Firestore Write Operations: Save or delete documents within a Firestore collection. Authentication: Check if a user is authenticated before performing operations. Logging: Optional logging of operations, errors, and completion times for better visibility. Installation Add the following to your pubspec.yaml:

yaml Copy code dependencies: cloud_firestore: ^4.1.0 logger: ^1.2.0 Usage

1. Firestore Read Operations The FirestoreReadRepository mixin provides read operations for fetching a document by ID and fetching all documents from a collection.

Example dart Copy code import 'package:your_package/firestore_mixin.dart';

class UserReadRepository with FirestoreReadRepository { @override String get collection => 'users';

@override FirestoreReadService get firestoreReadService => FirestoreServiceImpl();

@override LoggerService? get loggerService => LoggerServiceImpl(Logger(), true); }

void fetchUserById(String userId) async { final userRepository = UserReadRepository();

try { final userDocument = await userRepository.fetchDocumentById(docId: userId); if (userDocument.exists) { final userData = userDocument.data(); print('User data: $userData'); } else { print('User not found'); } } catch (e) { print('Error fetching user: $e'); } } 2. Firestore Write Operations The FirestoreWriteRepository mixin provides write operations to save and delete documents in a Firestore collection.

Example dart Copy code class UserWriteRepository with FirestoreWriteRepository { @override String get collection => 'users';

@override FirestoreWriteService get firestoreWriteService => FirestoreWriteServiceImpl();

@override LoggerService? get loggerService => LoggerServiceImpl(Logger(), true); }

void saveUser(Map<String, dynamic> userData) async { final userRepository = UserWriteRepository();

try { await userRepository.saveDocument(data: userData); print('User saved successfully'); } catch (e) { print('Error saving user: $e'); } } 3. Authentication The AuthRepository mixin provides an isAuthenticated check using the AuthService abstraction. This can be combined with other mixins to ensure that only authenticated users can perform certain operations.

Example dart Copy code class AuthenticatedUserRepository with FirestoreReadRepository, FirestoreWriteRepository, AuthRepository { @override String get collection => 'users';

@override FirestoreReadService get firestoreReadService => FirestoreServiceImpl();

@override FirestoreWriteService get firestoreWriteService => FirestoreWriteServiceImpl();

@override AuthService get authService => FirebaseAuthService();

@override LoggerService? get loggerService => LoggerServiceImpl(Logger(), true); }

void fetchUserIfAuthenticated(String userId) async { final userRepository = AuthenticatedUserRepository();

try { await userRepository.checkAuthenticated(); final userDocument = await userRepository.fetchDocumentById(docId: userId); if (userDocument.exists) { final userData = userDocument.data(); print('User data: $userData'); } else { print('User not found'); } } catch (e) { print('Error: $e'); } } 4. Combining Read, Write, and Auth If you want to combine both read and write operations with authentication, you can create a repository that includes both FirestoreReadRepository, FirestoreWriteRepository, and AuthRepository.

Example dart Copy code class FullUserRepository with FirestoreReadRepository, FirestoreWriteRepository, AuthRepository { @override String get collection => 'users';

@override FirestoreReadService get firestoreReadService => FirestoreServiceImpl();

@override FirestoreWriteService get firestoreWriteService => FirestoreWriteServiceImpl();

@override AuthService get authService => FirebaseAuthService();

@override LoggerService? get loggerService => LoggerServiceImpl(Logger(), true); } Logging By providing a LoggerService, you can enable logging for any operation. You can log messages, errors, and completion times for operations like fetching or saving documents.

Example dart Copy code final loggerService = LoggerServiceImpl(Logger(), true); // Enable logging final userRepository = FullUserRepository();

userRepository.loggerService?.log('Fetching all users...'); Classes and Mixins Firestore Read Operations FirestoreReadService: Abstract class for read operations. FirestoreReadRepository: Mixin for fetching documents from Firestore. Firestore Write Operations FirestoreWriteService: Abstract class for write operations. FirestoreWriteRepository: Mixin for saving and deleting documents. Authentication AuthService: Abstract class for authentication. AuthRepository: Mixin for checking authentication. Logging LoggerService: Abstract class for logging operations. Conclusion This package offers a modular, reusable solution for handling Firestore operations and authentication in Dart and Flutter applications. By using mixins, developers can cleanly separate concerns and only include the functionality they need.

Feel free to modify and extend the code according to your project requirements.