I made a regression here 17366d3bcc (diff-ddeebb36d131f89ca91be9d04c2baefaR10)
When the tag is added, people watching specific tag are notified but also people watching specific category.
Therefore, `notify_post_users` should accept options who should be notified.
So when `category` is added to the topic, users watching topic and users watching category are notified.
When `tag` is added to the topic, users watching topic and users watching tag are notified
Finally, when a new post is created, everybody is notified, topic watchers, category watchers, tag watchers.
Zeitwerk simplifies working with dependencies in dev and makes it easier reloading class chains.
We no longer need to use Rails "require_dependency" anywhere and instead can just use standard
Ruby patterns to require files.
This is a far reaching change and we expect some followups here.
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
Krzysztof Kotlarek
Sam Saffron
Maja Komel
Régis Hanol