Software Design

DDD Aggregate Root: Order & Order Items

UML Class Diagrams · made in Skemio

UML class diagram demonstrating DDD Aggregate Root with Order controlling access and updates to OrderItem entities and Product references.
UML class diagram demonstrating DDD Aggregate Root with Order controlling access and updates to OrderItem entities and Product references.
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What it shows

  • Aggregate root acts as the sole transactional boundary for updates
  • External callers never access child entities directly for modifications
  • Enforces invariants like max order quantity and pricing recalculation

The takeaway

Route all entity modifications strictly through the Aggregate Root to guarantee business consistency.

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