Some important little upgrades but mostly straightforward!
Note that there's still a known issue where item searches crash, I was hoping that this was a bug in Rails 4.2 that would be fixed on upgading to 5, but nope, oh well!
Also uhh I just got a bit silly and didn't actually mean to go all the way to 5.2 in one go, I had meant to start at 5.0… but tbh the 5.1 and 5.2 changes seem small, and this seems to be working, so. Yeah ok let's roll!
Some tricks required here to get the dependencies to work out, but we got it!!
Oh also, we move away from the rbenv in Ubuntu's package manager, because it doesn't support more recent Rubies like 2.4.10.
This labeling technique hasn't worked in a long time bc it requires being logged in. These days we just manually label them with the 2020 support tools I think!
Clearing out the Neopets gem should help us manage some gem dep conflicts in the 4.2 upgrade too (I think the nokogiri one gets tricky?)
Idk I guess these are the default place to put certain settings, but idk if they're still canonical, and I'd rather just not have files that don't mean anything rn!
Idk exactly what's going on with dotenv-deployment, if it turns out it was critical to our deploy process then we'll change the deploy process! It's deprecated and conflicts with gem deps for `dotenv-rails`.
Grouping stuff a bit more sensibly and with explanations! I just finished deleting a bunch of gems we're not really using, and this helped me audit that the ones we still have here we generally actually want.
idk why we were pulling from git before, probably to get a feature that wasn't pushed to rubygems yet? But now the latest rubygems version matches the latest repo commit (both back in 2017 lol), so let's do that for greater stability and clarity!
At one point we piloted a "Camo" service to proxy HTTPS image urls for us, but it doesn't exist anymore.
We already have proxies and stuff for this, so I left `Image` as a placeholder for this, but it's not working yet!
This also deletes our final reference to the Addressable gem, so we can remove it!
I don't think these work anymore, and our volunteers get new items into the db fast anyway, Impress 2020 is doing better spidering these days. And then we get to remove the cron job `whenever` gem!
Using `s3_path` and stuff made it sound like we were still referencing the original Amazon S3 images - but actually our new asset proxy just uses the same path structure, and we didn't change anything about it.
Oh also I deleted an after_conversion method that isn't used anymore, forgot about that!
Yay, we've deleted all our background tasks!
We'll probably want to replace some of the basic functionality like certain caching? But we can deal with that as we run into it.
The direct motivation here was a seeming version conflict between Rails 4.2's rack dependency and latest Resque's rack dependency... but this is just nice complexity elimination regardless, we want this anyway :3
We've already swapped out the backend for this stuff to Impress 2020, so the resque task and the broken image report UI aren't actually relevant anymore. Delete them!
This helps us delete Resque soon too.
Idk this one might actually be a bit of a pain to load? But I'd want to optimize it differently anyway, and there's overhauls we're already planning to do here.
Huh! This cache key seemed to only be referenced in checks and expirations, but was never actually used! So I guess we've been loading the modeling predictions every time for a while huh??
We'll get smarter about that someday, but anyway, that lets us delete our Item resque tasks and ItemObserver!
Again I'm just not convinced of the perf on this, and it enables us to delete some whole infra over it, we can improve it another time if it's useful to!
Just removing some caching and the expiration of it! There's still more superfluous(?) caching on the item page to audit, but these seem a bit more sensible about avoiding loading extra data.
In the interest of clearing out Resque, I'm just gonna remove a lot of our more complex caching stuff, and we can do a perf pass for things like big item list pages once everything's upgraded. (I'm hopeful that the upgrades themselves improve perf; and if not, that some improved sensibilities 10 years later can find simpler approaches.)
We uninstalled Flex, our Elasticsearch gem, to replace item search with direct DB queries; but I forgot these calls, oops!
I also kinda want to see about deleting the resque tasks altogether, since I'm not sure how to get Resque installed on latest rails bc there seems to be a conflict over the version of Rack? And it'd be nice to get rid of the complexity if we can.
Back in the day, `all` would immediately load up a query into an array, but now I think it's an alias for what `scoped` used to be: a relation that contains everything.
