An In-Depth Understanding of Aggregation in Domain-Driven Design

In the domain-driven design (DDD) structure, aggregation is difficult to understand and is also a key obstacle in the DDD learning curve. Reasonably designed aggregation clearly expresses business consistency and is more likely to lead to clear implementations. However, poorly designed aggregation or the absence of aggregation in the design fails to lead to clear implementations.

The concept of aggregation is not complex. This article is intended to return to the essence of aggregation and give some valuable suggestions on its definition and practice.