Rails adds round_mode parameter support to number helpers

Rails has added :round_mode parameter support to number helpers

Ruby 2.7 - Setting $ special variables to non-nil value is now warned

In Ruby 2.7, setting special variable $, $; $/ $\ to non-nil values will now show a deprecated warning

Eager loading Active Storage models to avoid N+1 issues

Removing N+1 queries when we access the Active Storage attachments associated with an ActiveRecord model.

Rails adds jitter to ActiveJob::Exceptions.retry_on

Rails adds jitter to ActiveJob::Exceptions.retry_on to cater to thundering herd effect

Ruby Hash#transform_keys now accepts a hash that maps existing keys to new keys

Ruby Hash#transform_keys now also accepts a hash that maps the existing hash keys to new keys

Rails has added strict loading mode to prevent lazy loading

Rails has added strict loading mode to prevent lazy loading of associations and help avoid N + 1 queries

Rails adds config rake_eager_load

Rails has added the option to eager load all the registered name spaces in rake tasks.

Rails has added support for automatic database connection switching from primary to the replica

Rails has added support for automatic database connection switching from primary to the replica

Ruby 2.7 removes taint checking mechanism

Ruby 2.7 access and setting of $SAFE is now always warned. $SAFE will become a normal global variable in Ruby 3.0

Rails 6.1 adds at option to perform_enqueued_jobs test helper

Rails 6.1 has added at option to perform_enqueued_jobs test helper to run only jobs which are scheduled at or before the passed in time