如何将对象添加到由聚合根维护的集合中 [英] how should i add an object into a collection maintained by aggregate root

问题描述

让我说我有BlogPost聚合根。它包含一个List < Comment> 。

BlogPost AddComment签名应如何显示？是否可以使用：

lets say i have a BlogPost aggregate root. it holds a List<Comment>.
how should the BlogPost AddComment signature look? is it OK to use:

public void AddComment(Comment comment)
{
    Comments.Add(comment);
}

或者我应该避免在其外部创建对root的孩子的引用，并执行以下操作：

or should i avoid creating references to root's children outside of it, and do something like this:

public void AddComment(string text, string email)
{
    Comment comment = new Comment(text, email);
    Comments.Add(comment);
}

推荐答案

如果您相信DDD，那么最好了解一些实体根下的实体，只要您不在集合外的某个地方存储ID或对其的引用。

If you believe in DDD, it's perfectly fine to know about some entity beneath the aggregate root, as long as you do not store an ID or a reference to it somewhere outside of the aggregate.

我会选择 blogPost.AddComment（new Comment（...）） -version。

I would go for the blogPost.AddComment(new Comment(...))-version.

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