Ruby on Rails: v6.0.1.rc1 Release

Active Support

• ActiveSupport::SafeBuffer supports Enumerator methods.

  Shugo Maeda

• The Redis cache store fails gracefully when the server returns a "max number of clients reached" error.

  Brandon Medenwald

• Fixed that mutating a value returned by a memory cache store would unexpectedly change the cached value.

  Jonathan Hyman

• The default inflectors in zeitwerk mode support overrides:

  # config/initializers/zeitwerk.rb
  Rails.autoloaders.each do |autoloader|
    autoloader.inflector.inflect(
      "html_parser" => "HTMLParser",
      "ssl_error"   => "SSLError"
    )
  end
  

  That way, you can tweak how individual basenames are inflected without touching Active Support inflection rules, which are global. These inflectors fallback to String#camelize, so existing inflection rules are still taken into account for non-overridden basenames.

  Please, check the autoloading guide for zeitwerk mode if you prefer not to depend on String#camelize at all.

  Xavier Noria

• Improve Range#===, Range#include?, and Range#cover? to work with beginless (startless) and endless range targets.

  Allen Hsu, Andrew Hodgkinson

• Don't use Process#clock_gettime(CLOCK_PROCESS_CPUTIME_ID) on Solaris

  Iain Beeston

Active Model

• No changes.

Active Record

• Common Table Expressions are allowed on read-only connections.

  Chris Morris

• New record instantiation respects unscope.

  Ryuta Kamizono

• Fixed a case where find_in_batches could halt too early.

  Takayuki Nakata

• Autosaved associations always perform validations when a custom validation context is used.

  Tekin Suleyman

• sql.active_record notifications now include the :connection in their payloads.

  Eugene Kenny

• A rollback encountered in an after_commit callback does not reset previously-committed record state.

  Ryuta Kamizono

• Fixed that join order was lost when eager-loading.

  Ryuta Kamizono

• DESCRIBE queries are allowed on read-only connections.

  Dylan Thacker-Smith

• Fixed that records that had been inspected could not be marshaled.

  Eugene Kenny

• The connection pool reaper thread is respawned in forked processes. This fixes that idle connections in forked processes wouldn't be reaped.

  John Hawthorn

• The memoized result of ActiveRecord::Relation#take is properly cleared when ActiveRecord::Relation#reset or ActiveRecord::Relation#reload is called.

  Anmol Arora

• Fixed the performance regression for primary_keys introduced MySQL 8.0.

  Hiroyuki Ishii

• insert, insert_all, upsert, and upsert_all now clear the query cache.

  Eugene Kenny

• Call while_preventing_writes directly from connected_to.

  In some cases application authors want to use the database switching middleware and make explicit calls with connected_to. It's possible for an app to turn off writes and not turn them back on by the time we call connected_to(role: :writing).

  This change allows apps to fix this by assuming if a role is writing we want to allow writes, except in the case it's explicitly turned off.

  Eileen M. Uchitelle

• Improve detection of ActiveRecord::StatementTimeout with mysql2 adapter in the edge case when the query is terminated during filesort.

  Kir Shatrov

Action View

• UJS avoids Element.closest() for IE 9 compatibility.

  George Claghorn

Action Pack

• ActionDispatch::SystemTestCase now inherits from ActiveSupport::TestCase rather than ActionDispatch::IntegrationTest. This permits running jobs in system tests.

  George Claghorn, Edouard Chin

• Registered MIME types may contain extra flags:

  Mime::Type.register "text/html; fragment", :html_fragment
  

  Aaron Patterson

Active Job

• No changes.

Action Mailer

• No changes.

Action Cable

• No changes.

Active Storage

• ActiveStorage::AnalyzeJobs are discarded on ActiveRecord::RecordNotFound errors.

  George Claghorn

• Blobs are recorded in the database before being uploaded to the service. This fixes that generated blob keys could silently collide, leading to data loss.

  Julik Tarkhanov

Action Mailbox

• No changes.

Action Text

• No changes.

Railties

• The zeitwerk:check Rake task reports files outside the app's root directory, as in engines loaded from gems.

  Xavier Noria

• Fixed a possible error when using the evented file update checker.

  Yuji Yaginuma

• The sqlite3 database files created by the parallel testing feature are included in the default .gitignore file for newly-generated apps.

  Yasuo Honda

• rails new generates a .keep file in tmp/pids. This fixes starting a server via rackup instead of rails server.

  Rafael Mendonça França