Question

I’ve got a StoreOwner entity. StoreOwner has a Store property.

public class Product { }

public class Store { 
    public IEnumerable<Product> Products { get; private set; }
}

public class StoreOwner { 
    public Store Store { get; private set }
}

I’ve got the following user story:

As a store owner, I can add a product to my store.

Where should the behavior of “adding the product to the store” live? On the StoreOwner or the Store?

If it’s the store, what would the method name be?

Answer 1

I would put it in Store, as I’m guessing the products collection is a child entity in Store. Something like Store.AddProduct() as opposed to exposing the products collection.

If there is logic to make sure only the current owner can do it, I believe this optionally belongs in Store only if Store already has knowledge about the owner, but should definitely be validated before trying to all AddProduct.

That part seems like a user role, so perhaps this belongs in your UI controller or if the current user is actually the store owner, perhaps factor this into the user role and authorise against it.