I did this once

I was generating a large fake dataset that had to make sense in certain ways. I created a neat thing in C# where you could index a hashmap by the type of model it stored, and it would give you the collection storing that data.

This made obtaining resources for generation trivial

However, it made figuring out the order i needed to generate things an effing nightmare

Of note, a lot of these resource "Pools" depended on other resource Pools, and often times, adding a new Pool dependency to a generator meant more time fiddling with the Pool standup code