Practical DDD in TypeScript: Entity

2023/07/19

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In this article, Marko Milojevic discusses the misinterpretation of the Entity pattern in Domain-Driven Design (DDD). Many developers mistakenly associate the Entity pattern with database structures, but its true purpose lies in encapsulating essential business logic. Entities should be part of the domain layer, working alongside Value Objects to form the core of the business logic.

Milojevic emphasizes that the Entity pattern should not be confused with frameworks or practices that mirror database tables. Instead, it should be used to represent and manipulate the fundamental concepts and behaviors of the domain.

To illustrate the correct usage of the Entity pattern, here's an example in TypeScript:

class User {
  private id: string;
  private name: string;
  private email: string;

  constructor(id: string, name: string, email: string) {
    this.id = id;
    this.name = name;
    this.email = email;
  }

  // Getters and setters

  // Business logic methods
}

By following the correct approach, developers can ensure that their Entities are focused on the domain and maintain a clear separation of concerns. Understanding the true purpose of the Entity pattern is crucial for building robust and maintainable applications using DDD principles.