DDD中的存储库类

问题描述

我正在尝试关注DDD，我有一个Question类和一个Feedback类（等等）。我希望能够计算问题的数量，反馈的数量以及许多其他被视为元操作的事情。

I am trying to follow DDD and I have a Question class and a Feedback class (among others). I want to be able to count the number of questions, number of feedbacks and many other things which is considered meta operations.

这种元方法是否应该相同存储库作为属于该类的其他方法，或者它们应该位于MetaRepository中，您在其中使用不同的元方法查询数据库（在这种情况下，所有类都将混合使用）？

Should such "meta" methods be in the same repository as the other methods belonging to the class, or should they be in a MetaRepository where you have different meta methods that queries the database (in this case all classes will be mixed)?

推荐答案

DDD中没有任何内容禁止每个聚合使用多个存储库。您可以简单地为基本查询和生命周期方法（IQuestionsRepository）创建一个存储库，并为您称为元或统计目的的单独存储库（IQuestionsStatistics）。这适用于较大的域，其中 one-repository-per-aggregate 原则可能导致方法爆炸和SRP违规。以下DDD不应违反基本的OOP原则。

Nothing in DDD prohibits having more than one repository per aggregate. You can simply have one repository for basic queries and lifecycle methods (IQuestionsRepository) and a separate repository for what you call 'meta' or 'statistics' purposes (IQuestionsStatistics). This works very well for a larger domains where following one-repository-per-aggregate principle may result in 'method explosion' and SRP violation. Following DDD should not go against basic OOP principles.

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