How value objects are saved and loaded?

Question

Since there aren no respositories for value objects. How can I load all value objects?

Suppose we are modeling a blog application and we have this classes:

• Post (Entity)
• Comment (Value object)
• Tag (Value object)
• PostsRespository (Respository)

I Know that when I save a new post, its tags are saved with it in the same table. But how could I load all tags of all posts. Should PostsRespository have a method to load all tags? I usually do it, but I want to know others opinions

Answer 1

I'm looking for a better solution for this question and I found this post:

http://gojko.net/2009/09/30/ddd-and-relational-databases-the-value-object-dilemma/

This post explain very well why there is a lot of confusion with value objects and databases. Here you are phrase which liked me too much:

• "Persistence is not an excuse to turn everything to entities."

Gojko Adzic, give us three alternatives to save our value objects.