entity_store 6.0.0

Entity State Management Package

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EntityStore Ecosystem

Overview

EntityStore is a comprehensive state management ecosystem for Flutter application development based on entity-centric design philosophy. It encapsulates business logic within immutable entities, provides abstracted data access through repository patterns, and achieves reactive UI synchronization.

🎯 Design Philosophy

EntityStore is designed based on three core principles:

1. Entity-First Design: Architecture centered around business objects (entities) that form the core of the application
2. Immutability Principle: State changes only through creation of new instances, preventing unexpected side effects
3. Reactive Synchronization: Seamless development experience where data changes automatically reflect in the UI

📦 Package Composition

The EntityStore ecosystem consists of three packages that can be selected based on your use case:

🏛️ entity_store (Core Package)

dependencies:
  entity_store: ^6.0.0-dev.13

• Role: Foundation for entity-based state management
• Features: Entity abstraction, reactive UI synchronization, basic repository patterns
• Use Cases: In-memory state management, prototyping, testing environments

🔥 entity_store_firestore

dependencies:
  entity_store_firestore: ^6.0.0-dev.15

• Role: Integration with Firebase Firestore
• Features: Cloud synchronization, real-time updates, offline support, transaction processing
• Use Cases: Multi-device synchronization, real-time collaboration, scalable web apps

💾 entity_store_sembast

dependencies:
  entity_store_sembast: ^6.0.0-dev.13

• Role: Integration with Sembast (NoSQL local database)
• Features: High-performance local storage, complex queries, data encryption support
• Use Cases: Offline-first apps, high-speed local processing, privacy-focused applications

✨ Key Benefits

🚀 Enhanced Development Efficiency

// Simple entity operations
final todo = context.watchOne<int, Todo>(todoId)!;
return CheckboxListTile(
  title: Text(todo.name),
  value: todo.isDone,
  onChanged: (value) => todoRepository.save(todo.toggle()),
);

🔄 Automatic UI Synchronization

Entity changes are automatically reflected throughout the UI. No need to write complex state management code.

🏗️ Flexible Architecture

// Development: In-memory
final repository = TodoRepository(controller, InMemoryStorageHandler());

// Production: Firestore
final repository = TodoFirestoreRepository(controller, firestore);

// Local-focused: Sembast
final repository = TodoSembastRepository(controller, database);

🔒 Type Safety

TypeScript-like type safety allows compile-time error detection.

🎯 Usage Example: Todo Application

Entity Definition

class Todo implements Entity<int> {
  @override
  final int id;
  final String name;
  final bool isDone;
  final DateTime createdAt;

  const Todo({
    required this.id,
    required this.name,
    required this.isDone,
    required this.createdAt,
  });

  // Create a new Todo
  factory Todo.create(int id, String name) {
    return Todo(
      id: id,
      name: name,
      isDone: false,
      createdAt: DateTime.now(),
    );
  }

  // Toggle completion status
  Todo toggle() => Todo(
    id: id,
    name: name,
    isDone: !isDone,
    createdAt: createdAt,
  );

  // Update name
  Todo rename(String newName) => Todo(
    id: id,
    name: newName,
    isDone: isDone,
    createdAt: createdAt,
  );
}

Repository Implementation (Firestore Version)

class TodoFirestoreRepository extends FirestoreRepository<int, Todo> {
  TodoFirestoreRepository(super.controller, super.instance);

  @override
  String get collectionId => 'todos';

  @override
  String idToString(int id) => id.toString();

  @override
  Todo fromJson(Map<String, dynamic> json) {
    return Todo(
      id: json['id'] as int,
      name: json['name'] as String,
      isDone: json['isDone'] as bool,
      createdAt: DateTime.parse(json['createdAt'] as String),
    );
  }

  @override
  Map<String, dynamic> toJson(Todo entity) {
    return {
      'id': entity.id,
      'name': entity.name,
      'isDone': entity.isDone,
      'createdAt': entity.createdAt.toIso8601String(),
    };
  }
}

UI Implementation

class TodoList extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // Watch all todos
    final todos = context.watchAll<int, Todo>();
    
    return ListView.builder(
      itemCount: todos.length,
      itemBuilder: (context, index) {
        final todo = todos.values.elementAt(index);
        return TodoTile(todoId: todo.id);
      },
    );
  }
}

class TodoTile extends StatelessWidget {
  final int todoId;
  
  const TodoTile({required this.todoId});

  @override
  Widget build(BuildContext context) {
    // Watch specific todo
    final todo = context.watchOne<int, Todo>(todoId);
    
    if (todo == null) return const SizedBox.shrink();
    
    return ListTile(
      title: Text(todo.name),
      leading: Checkbox(
        value: todo.isDone,
        onChanged: (_) {
          // Entity update (automatic UI sync)
          todoRepository.save(todo.toggle());
        },
      ),
      trailing: IconButton(
        icon: const Icon(Icons.delete),
        onPressed: () {
          // Entity deletion (automatic UI update)
          todoRepository.deleteById(todo.id);
        },
      ),
    );
  }
}

Application Setup

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return EntityStoreProviderScope(
      entityStoreNotifier: entityStoreNotifier,
      child: MaterialApp(
        title: 'EntityStore Todo',
        home: TodoHomePage(),
      ),
    );
  }
}

🎨 Advanced Features

Reactive Queries

// Watch only incomplete todos
final activeTodos = context.watchAll<int, Todo>(
  (todo) => !todo.isDone,
);

// Watch count of completed todos
final completedCount = context.selectAll<int, Todo, int>(
  (todos) => todos.values.where((todo) => todo.isDone).length,
);

Efficient Data Fetching

// Pagination support
final todos = await todoRepository
  .query()
  .orderBy('createdAt', descending: true)
  .limit(20)
  .findAll();

// Conditional search
final urgentTodos = await todoRepository
  .query()
  .where('priority', isEqualTo: 'high')
  .where('isDone', isEqualTo: false)
  .findAll();

Transaction Processing (Firestore)

await todoRepository.transaction((transaction) async {
  final todo = await transaction.findById(todoId);
  if (todo != null) {
    await transaction.save(todo.toggle());
    await transaction.save(createLogEntry(todo));
  }
});

🔧 Getting Started

1. Package Selection and Installation

dependencies:
  flutter:
    sdk: flutter
  
  # Core package (required)
  entity_store: ^6.0.0-dev.13
  
  # Choose based on your needs
  entity_store_firestore: ^6.0.0-dev.15  # Cloud sync
  entity_store_sembast: ^6.0.0-dev.13    # Local DB

2. Basic Setup

// Initialize entity store
final entityStoreNotifier = EntityStoreNotifier();
final entityStoreController = EntityStoreController(entityStoreNotifier);

// Repository setup (example: Firestore)
final firestore = FirebaseFirestore.instance;
final todoRepository = TodoFirestoreRepository(
  entityStoreController,
  firestore,
);

3. Dependency Injection (Recommended)

// Example using Riverpod
final entityStoreProvider = Provider((ref) => EntityStoreNotifier());

final entityStoreControllerProvider = Provider((ref) => 
  EntityStoreController(ref.watch(entityStoreProvider)));

final todoRepositoryProvider = Provider((ref) => 
  TodoFirestoreRepository(
    ref.watch(entityStoreControllerProvider),
    FirebaseFirestore.instance,
  ));

🌟 Package Selection Guide

Requirements	Recommended Package	Reasons
🧪 Prototyping & Learning	entity_store	Simple, lightweight, low learning curve
🌐 Real-time Collaboration	entity_store_firestore	Auto-sync, scalability
📱 Offline-first Apps	entity_store_sembast	Fast, offline support, privacy
🏢 Enterprise Apps	Combined usage	Hybrid configuration as needed

🚀 Next Steps

1. Quick Start Guide - Experience EntityStore in 5 minutes
2. Architecture Guide - Detailed explanation of design philosophy
3. Best Practices - Practical development know-how
4. Migration Guide - Migration from existing projects

🤝 Community

• GitHub: soraef/entity_store
• Discord: EntityStore Community
• Issues: Bug reports & feature requests at GitHub Issues

📄 License

This project is released under the MIT License.