正确的聚合根是什么？
我有以下数据结构：
class Post
{
public string Title { get; set;}
public Category Category { get; set;}
}
记住一篇文章总是属于一个且仅一个类别，我的推理是否正确？
Category是聚合根（因为没有它，帖子就无法存在）- 应该有一个
CategoryRepository（具有诸如GetCategory< /code> 和GetPost），但不是PostRepository（因为Post不是聚合根）
I have the following data structure:
class Post
{
public string Title { get; set;}
public Category Category { get; set;}
}
Bearing in mind a post always belongs to one and only one category is my reasoning correct?
Categoryis the aggregate root (since a post cannot exist without it)- There should be a
CategoryRepository(with methods such asGetCategoryandGetPost) but not aPostRepository(becausePostis not an aggregate root)
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您想如何引用
Post的实例？Post.Title是Post的唯一标识符吗？如果是这样，那么Post是一个有效的聚合根，您应该创建一个PostRepository来检索Post的实例给定它的标题。以汽车为例。汽车必须有颜色，但仅仅因为汽车没有颜色就无法存在，就说颜色是聚合根，这是错误的做法。我想根据汽车的车牌号（与其颜色无关）独立地引用一辆汽车。它必须有颜色这一事实只是我的汽车域模型的一个特征，它表明我无法在不提供颜色的情况下构建汽车实例。
How do you want to reference instances of
Post? IsPost.Titlea unique identifier for aPost? If so, thenPostis a valid aggregate root and you should create aPostRepositorywhich retrieves an instance ofPostgiven it'sTitle.Take the example of a car. A car must have a colour, but stating that the colour is the aggregate root just because a car cannot exist without one is the wrong thing to do. I want to reference a car independently given it's license plate number (which is independent of it's colour). The fact that it must have a colour is simply a feature of my car domain model which states that I cannot construct a car instance without supplying the colour.
当涉及聚合根设计注意事项时，我经常引用此资源
RavenDB - StackOverflow 风格的 Live 投票预测。这解决了您的一些关键思维过程，并且应该向您展示为什么类别将是一个非常差的聚合根。
I often cite this resource when it comes to aggregate root design considerations
RavenDB - StackOverflow style voting with Live Projections. This addresses some of your key thought process and should show you why Category would be a VERY POOR aggregate root.