Repository Pattern

Repository Pattern

Implement a complete repository with CRUD operations and query methods.

Recommended Prerequisites

Complete these exercises first for the best learning experience:

• ○Clean Architecture Layers

0/1 completed

Background

The Repository Pattern abstracts data access behind an interface. Repositories provide CRUD operations (Create, Read, Update, Delete) and query methods without exposing storage implementation details.

Benefits:

• Abstraction: Swap storage (in-memory, SQL, NoSQL) without changing business logic
• Testability: Easy to mock for testing
• Single Responsibility: Data access logic isolated from business logic

Your Task

Implement a product repository with complete CRUD operations:

1. Create, Read (by ID and all), Update, Delete
2. Query method: FindByCategory
3. Handle errors (not found, duplicates)
4. Use in-memory storage (map)

Product Repository with CRUD

~25 minmedium

Implement full CRUD operations using the repository pattern

Copy

▶Open Editor

Show Hint

Key Concepts

• Repository Pattern: Abstracts data access behind a clean interface
• CRUD Operations: Create, Read, Update, Delete - fundamental data operations
• Query Methods: Specialized finders like FindByCategory for common queries
• Error Handling: Return errors for not found, duplicates, and other failures
• Data Encapsulation: Internal storage (map) hidden from callers