Re: RE: Returning newly created entities from the aggregate

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On 15.12.2013. 16:55, [email protected] wrote:
>  
>
> Hi Ramin,
>
>
> The ID for the sub organisation isn't created until it is persisted to the database unfortunately. And in writing this I've just realised I can't just return the ID from the method for that same reason.
>
>
> I'm not sure I understand what you mean with regards to the polling technique. Are you suggesting that I could poll to retrieve the result of the command and retrieve the ID that way? Would that not
be similar to just returning a value from the command in the first place?
>
>
> 

I think there are several conflicting issues here.
1) I think mutating object during command is perfectly fine. In HTTP terminology this would mean that you can return the same object (or reference to it) as a result. This would require you to use
synchronous domain events.
2) Static domain event handlers are evil, especially if you are working with a database, since they lack notion of transactions.
3) Pooling and other ways of obtaining newly created value are just complicating the design for no benefit.
4) If your DB layer works in lazy mode, this creates a set of it's own problems.

So, I would implement it as a domain event, which gets ID populated on the server and returns its instance to the client.

Regards,
Rikard

- -- 
Rikard Pavelic
https://dsl-platform.com/
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