Does a "delegated type" work with preloading associations, ala "includes"? This remains a pain point with many polymorphic associations in Rails, but not sure how the new functionality handles if, if it does at all.
Based on this GitHub comment[0], it appears the answer is yes although it requires a little additional customization out of the box to prevent N+1 queries..
In conjunction with Rails's "russian-doll" caching, N+1 queries are (or at least, can be) a good thing.
This sounds counterintuitive; but, in the common case of read-heavy services, N ≐ 0 after the first access. When something changes, subsequent views end up loading & rendering the one record that changed, instead of preloading an entire collection.
However, achieving this in practice requires some care in the nesting of view partials and records.
Hey, just wanted to thank you for the link. This sent me down a deep rabbit-hole of DHH interviews! I'm surprised I haven't taken notice of him before, he has so many profound insights. I am really grateful :)
You're welcome. I think he's a deceptively clear thinker, by which I mean, DHH tends to supply a correct and insightful answer without discussing all the potentially wrong ones, or even unpacking all the insights contained within. It's left as an exercise for the student to realise how any particular "road not taken" would've been inconsistent with Rails's underlying principles.
I don't mind that, since I've chosen to infer an assumption that we're all as smart as he is. (even if it does then take me years to explain things to myself...)
If you didn't find it already, his "On Writing Software Well" video series is a fascinating, and sadly abbreviated, journey into his own application code.
