domain-driven-design - 对聚合根内实体的操作

Question

如果我设计了如下所示的 AR，您认为我应该如何更新订单行对象之一中的属性？

例如，我如何更改订单行之一的标题(示例问题)

这是订单聚合根

public class Order
{
    private readonly int id;
    private readonly Customer customer; // Customer is another Aggregate
    private readonly IList<OrderLine> orderLines;
    private readonly IOrderLineFactory orderLineFactory;

    public Order(int id, Customer customer, IOrderLineFactory orderLineFactory)
    {
        this.id = id;
        this.customer = customer;
        this.orderLines = new List<OrderLine>();
        this.orderLineFactory = orderLineFactory;
    }

    public void AddOrderLine(Item item, int quantity)
    {
        OrderLine orderLine = orderLineFactory.Create(this, item, quantity);
        orderLines.Add(orderLine);
    }
}

Answer 1

Order order = orderRepository.find(orderId);
order.changeTitle(orderLineId, "New title");

其中 'orderLineId' 可以是行号或索引或其他内容，只要它是特定于聚合根的(不是全局 ID)。请查看 this回答一个类似的问题。