CODEWITHSUNDEEP
domain-driven-designaggregaterootaggregates
Jason
Jason

Reputation: 2721

Where is the proper place to put domain logic to update a child of an aggregate root?

Is it a best practice to update children of an aggregate root directly, or only through its aggregate root? For example, which is preferred:

Order.UpdateOrderLineQuantity(orderLine, quantity);

or 

Order.OrderLines[0].UpdateQuantity(quantity);

Any guidance in this department would be appreciated.

Upvotes: 1

Views: 291

Answers (1)

Jeff Sternal
Jeff Sternal

Reputation: 48675

An aggregate root is an object that encapsulates related child objects, so you should use the first technique.

In the same way that callers shouldn't care if Order IDs are stored as integers or byte arrays, they shouldn't care or know whether it uses OrderLines or HideousLegacyObjects to store and manipulate order details.

Upvotes: 2

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