Hi, Wojtek here. Let’s explore this week’s changes in the Rails codebase.

Stop setting the public-read ACL on S3 uploads for services configured with public: true
Bucket owner enforced is now both the default and the recommended S3 object ownership setting, and rejects any request that specifies an ACL. Uploading through a public: true service to such a bucket previously failed outright because Active Storage always attached a public-read ACL, with no way to opt out. Setting this to false skips the ACL; grant public read access through a bucket policy instead. Buckets that still use ACLs can restore the previous behavior for a given service by setting the acl option explicitly in its upload configuration.

Add maintenance_database option to the PostgreSQL adapter
Database tasks connect to the postgres database by default. Some managed PostgreSQL services, such as DigitalOcean, do not provide a postgres database, so these tasks fail there. maintenance_database sets the database to connect to instead, like the –maintenance-db.

Forward other options from has_one_attached and has_many_attached
It is now possible to write:

class User < ApplicationRecord
  has_one_attached :avatar, deprecated: true
end

Freeze events emitted by ActiveSupport::EventReporter
Subscribers can no longer change the event seen by later subscribers. Modifying the event in place now raises FrozenError, so dup it first.

Fix rails.deprecation structured events not being emitted
Rails::StructuredEventSubscriber was never required by the framework, so with config.active_support.deprecation = :notify no rails.deprecation structured event was ever emitted to Rails.event.

Fix 5.1 version change_column to honor table_name_prefix
Migrations declaring version 5.1 or earlier now honor table_name_prefix and table_name_suffix.

Honor an explicit type on SQLite references in 6.0 migrations
References without a type: are unchanged, ie the adapter still makes them integer.

Until next time!