Why Clean Architecture Matters in Flutter
Clean Architecture helps separate business rules from framework-specific implementation. In Flutter, this means UI, state management, domain logic, repositories, and data sources should not be mixed into one layer.
Domain Entity vs Data Model
A domain entity represents the business meaning of data. A data model represents how data is stored, fetched, serialized, or deserialized from external sources such as REST APIs, Firebase, Supabase, or local databases.
Why They Should Not Be the Same
If domain entities and data models are merged, the business layer becomes dependent on external data formats. This makes the code harder to test, harder to change, and harder to maintain when the API response changes.
Feature-Based Folder Structure
A scalable Flutter project can be structured by feature. Each feature contains data, domain, and presentation layers so related files stay close together as the application grows.
features/
auth/
data/
models/
datasources/
repositories/
domain/
entities/
repositories/
usecases/
presentation/
pages/
widgets/
bloc/