How to check existence of another aggregate id in preconditions ? about node-cqrs-domain HOT 3 CLOSED

Every pre-condition and business rule has only what's defined in the aggregate. Please do not think in data! Perhaps you need to enlarge your aggregate...

from node-cqrs-domain.

Okay I see. I'm used to RDBMS so... I see "by table". Though, how would you see that kind of aggregate? Let's say you're enabling your client to store information about 1000's of people. Each of them has multiple contact information (first name, last name, phone, email, ...), but you have to be sure that each has a first name and last name set.

Also, the client could define custom contact information numbers that he wants to define for each of his registered person. Let's say the client wants to be able to add "Postal Name" as a contact information type, and mark it as required for all new clients?

And also, each person may or may not have multiple mandates associated. Each of those mandates have activities did on them, of a certain type (which the client defines for his business)... You get the idea? Maybe RDBMS is more tailored for this kind of job. What do you think ?

I understand the concept of aggregate as an "independent logical unit", but what happens when you have to normalize the data, and moreover, when the client wants to be able to normalize its data for his business?

from node-cqrs-domain.

All this could fit with cqrs... but I think you don't want to design the intentions of the system, but only manage your data. So a better fit is to use a CRM/ERP.

from node-cqrs-domain.