Follow up with the previous link, if I want to run system test cases in Rails using:

class ApplicationSystemTestCase < ActionDispatch::SystemTestCase
  driven_by :selenium, using: :headless_firefox, screen_size: [1400, 1400]
end

Then I need to install Firefox, as well as fonts, so that the screenshots are rendered properly.

apk add xvfb firefox ttf-dejavu

(note: fonts are required for Firefox to render pages)

A great article for using docker-compose as a dev environment for rails

Interesting articles on avoiding 3 common mistakes when working with ActiveRecord.

The best one:

<% -%>

Avoids line break after expression

Simpler authentication than Devise

TL;DR lengthy paper about RoR applications and possible attacks. Good read for any dev.

TL;DR how to properly use caching with Rails