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Editorial Team
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Asked: 2026-06-17T16:35:37+00:00

1) a) Entities within an Aggregate should only be accessed via Aggregate root .

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1)
a) Entities within an Aggregate should only be accessed via Aggregate root. While it is possible for the root to pass transient references to internal entities to external objects ( for the duration of a single operation ), I assume in most cases if external object needs to performs some operation on internal entity, it should call method(s) defined on the Aggregate root ( contrived example – Order.SetOrderLineTitle(...) )?

2) Only AGGREGATE roots can be obtained directly. All other objects must be found by traversal of associations.

a) When we say that external objects should access non-root entities by traversal of associations, do we mean they should call methods on Aggregate root ( e.g. Order.SetOrderLineTitle(...)), which in turn would perform operations on internal objects or do we mean that Aggregate root should pass a reference to internal entity to an external object or both?

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1 Answer

  1. Editorial Team

    1) Yes, this is the best way for the aggregate to maintain its integrity. Some say that this can result in aggregates with very large number of methods, however in that case there may be multiple aggregates at play.

    2) Ideally, the aggregate would perform the required operation without passing references. There may be a case where passing a reference makes sense, but this should be implemented with care as it makes reasoning about integrity more difficult.

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