Ruby on Rails 15 was released on August 2019, 6.0. Apart from numerous fixes, the main innovations in version 6 are:
- Action Mailbox - Directs incoming mail to controller-like mailboxes.
- Action Text is the ability to store and edit rich text in Rails.
- Parallel testing - allows you to parallelize a test suite. Those. tests can be run in parallel.
- The test is Action Cable - will allow you to test the functionality of Action Cable at any level: connections, channels, broadcasts.
Webpacker is included by default in Ruby on Rails 6.
Update instructions are located at:
https://guides.rubyonrails.org/upgrading_ruby_on_rails.html
Source: linux.org.ru