You define the Order entity with properties like OrderId, CustomerId, and OrderDate. You also create a Value Object, Money, to represent the order total.
The Order entity has methods like CalculateTotal() and UpdateStatus(), which encapsulate business logic. The Money Value Object has methods like Add() and Subtract(). domain driven design eric evans ebook pdf 51
Imagine you're the lead developer of an e-commerce company that sells books online. Your company, "BookHub," wants to expand its platform to include features like personalized recommendations, loyalty programs, and same-day delivery. You define the Order entity with properties like
You identify the Order entity as an , which defines the boundaries of a transaction. You create a Repository, OrderRepository, to manage the lifecycle of Orders. The Money Value Object has methods like Add() and Subtract()
As you begin to design the new features, you realize that the current system is a mess. The database schema is rigid, and the business logic is scattered throughout the codebase. It's hard to make changes without breaking something.
Within the Ordering context, you create a that represents the business concepts and rules. You identify key entities like Order, Product, and Customer. You also define Value Objects like Money and Address.