Ah right, the callbacks in `ParentSwfAssetRelationship` don't get
called when Rails does automatic join-model management stuff. We need
the `Item` to call its `update_cached_fields` callback itself, too!
When fixing this, I found a new bug that arose, in how we infer
`body_id` for assets that fit all pets. Fixing that next!
This gives better output when they fail, and also avoids spurious
failures like when an array for `cached_compatible_body_ids` is replaced
by an identical one! (I'm running into this right now, and yeah, it
helps a lot lol)
Hmm, I think I made a mistake on `modeling_snapshot.rb:69`: I'm
assigning the *entire* `item.swf_assets` relation to *just* the assets
for the new model of it, which breaks all the other connections.
First, I'm disabling modeling. Then, I'll restore a backup. Then, I'll
write tests for that case, and fix it up!
Not actually touching alt style yet, just the very basic stuff about
how alt style can cause loading to fail in certain extremely rare cases
(specifically, if it's our first time seeing the underlying
color/species combo too, which… isn't gonna happen irl on DTI for a long
time if ever, I would guess, but hey!)
That is, if everything is the same as before, we don't need to change
anything in our database!
I also learned a bit more about RSpec syntax sugars, it's cute!
I forget, there was some tricky debugging about getting the fixtures
right, I think the previous commit doesn't *actually* pass from a clean
setting. Ah well, looks good now!
