In CQRS, how do you build the response when creating an entity?

Question

If using CQRS and creating an entity, and the values of some of its properties are generated part of the its constructor (e.g. a default active value for the

Answer 1

Some ideas:

1. Let your command handlers return values. This is the simplest option - just return what was created inside the entity. There is some disagreement about whether this is 'allowed' in CQRS though.
2. The preferred approach is to create your defaults (i.e.id) and pass them into your command - For example, https://github.com/gregoryyoung/m-r/blob/master/CQRSGui/Controllers/HomeController.cs in the Add method, a Guid is created and passed in to the CreateInventoryItem command - this could be returned in the response. This could get quite ugly if you have lots of things to pass in though.
3. If you can't do 1 or 2, you could try having some async way of handling this, but you haven't said what your use case is so it's difficult to advise. If you're using some sort of socket technology you could do sync-over-async style where you return immediately, then push some value back to the client once the entity has been created. You can also have some sort of workflow where you accept the command then poll / query on the thing being created