Rails 6.0.2.rc1 (November 27, 2019)

• Eager load translations during initialization.

  Diego Plentz

• Use per-thread CPU time clock on ActiveSupport::Notifications.

  George Claghorn

Rails 6.0.1 (November 5, 2019)

• 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_THREAD_CPUTIME_ID) on Solaris.

  Iain Beeston

Rails 6.0.0 (August 16, 2019)

• Let require_dependency in zeitwerk mode look the autoload paths up for
  better backwards compatibility.

  Xavier Noria

• Let require_dependency in zeitwerk mode support arguments that respond
  to to_path for better backwards compatibility.

  Xavier Noria

• Make ActiveSupport::Logger Fiber-safe. Fixes #36752.

  Use Fiber.current.__id__ in ActiveSupport::Logger#local_level= in order
  to make log level local to Ruby Fibers in addition to Threads.

  Example:

  logger = ActiveSupport::Logger.new(STDOUT)
  logger.level = 1
  p “Main is debug? #{logger.debug?}”

  Fiber.new {
  logger.local_level = 0
  p “Thread is debug? #{logger.debug?}”
  }.resume

  p “Main is debug? #{logger.debug?}”

  Before:

  Main is debug? false
  Thread is debug? true
  Main is debug? true

  After:

  Main is debug? false
  Thread is debug? true
  Main is debug? false

  Alexander Varnin

• Do not delegate missing marshal_dump and _dump methods via the
  delegate_missing_to extension. This avoids unintentionally adding instance
  variables when calling Marshal.dump(object), should the delegation target of
  object be a method which would otherwise add them. Fixes #36522.

  Aaron Lipman

Rails 6.0.0.rc2 (July 22, 2019)

• truncate would return the original string if it was too short to be truncated
  and a frozen string if it were long enough to be truncated. Now truncate will
  consistently return an unfrozen string regardless. This behavior is consistent
  with gsub and strip.

  Before:

  ‘foobar’.truncate(5).frozen?
  # => true
  ‘foobar’.truncate(6).frozen?
  # => false

  After:

  ‘foobar’.truncate(5).frozen?
  # => false
  ‘foobar’.truncate(6).frozen?
  # => false

  Jordan Thomas

Rails 6.0.0.rc1 (April 24, 2019)

• Introduce ActiveSupport::ActionableError.

  Actionable errors let’s you dispatch actions from Rails’ error pages. This
  can help you save time if you have a clear action for the resolution of
  common development errors.

  The de-facto example are pending migrations. Every time pending migrations
  are found, a middleware raises an error. With actionable errors, you can
  run the migrations right from the error page. Other examples include Rails
  plugins that need to run a rake task to setup themselves. They can now
  raise actionable errors to run the setup straight from the error pages.

  Here is how to define an actionable error:

  class PendingMigrationError < MigrationError #:nodoc:
    include ActiveSupport::ActionableError
  
    action "Run pending migrations" do
      ActiveRecord::Tasks::DatabaseTasks.migrate
    end
  end
  

  To make an error actionable, include the ActiveSupport::ActionableError
  module and invoke the action class macro to define the action. An action
  needs a name and a procedure to execute. The name is shown as the name of a
  button on the error pages. Once clicked, it will invoke the given
  procedure.

  Vipul A M, Yao Jie, Genadi Samokovarov

• Preserve html_safe? status on ActiveSupport::SafeBuffer#*.

  Before:

  (“
  ”.html_safe * 2).html_safe? #=> nil

  After:

  (“
  ”.html_safe * 2).html_safe? #=> true

  Ryo Nakamura

• Calling test methods with with_info_handler method to allow minitest-hooks
  plugin to work.

  Mauri Mustonen

• The Zeitwerk compatibility interface for ActiveSupport::Dependencies no
  longer implements autoloaded_constants or autoloaded? (undocumented,
  anyway). Experience shows introspection does not have many use cases, and
  troubleshooting is done by logging. With this design trade-off we are able
  to use even less memory in all environments.

  Xavier Noria

• Depends on Zeitwerk 2, which stores less metadata if reloading is disabled
  and hence uses less memory when config.cache_classes is true, a standard
  setup in production.

  Xavier Noria

• In :zeitwerk mode, eager load directories in engines and applications only
  if present in their respective config.eager_load_paths.

  A common use case for this is adding lib to config.autoload_paths, but
  not to config.eager_load_paths. In that configuration, for example, files
  in the lib directory should not be eager loaded.

  Xavier Noria

• Fix bug in Range comparisons when comparing to an excluded-end Range

  Before:

  (1..10).cover?(1…11) # => false

  After:

  (1..10).cover?(1…11) # => true

  With the same change for Range#include? and Range#===.

  Owen Stephens

• Use weak references in descendants tracker to allow anonymous subclasses to
  be garbage collected.

  Edgars Beigarts

• Update ActiveSupport::Notifications::Instrumenter#instrument to make
  passing a block optional. This will let users use
  ActiveSupport::Notifications messaging features outside of
  instrumentation.

  Ali Ibrahim

• Fix Time#advance to work with dates before 1001-03-07

  Before:

  Time.utc(1001, 3, 6).advance(years: -1) # => 1000-03-05 00:00:00 UTC

  After

  Time.utc(1001, 3, 6).advance(years: -1) # => 1000-03-06 00:00:00 UTC

  Note that this doesn’t affect DateTime#advance as that doesn’t use a proleptic calendar.

  Andrew White

• In Zeitwerk mode, engines are now managed by the main autoloader. Engines may reference application constants, if the application is reloaded and we do not reload engines, they won’t use the reloaded application code.

  Xavier Noria

• Add support for supplying locale to transliterate and parameterize.

  I18n.backend.store_translations(:de, i18n: { transliterate: { rule: { “ü” => “ue” } } })

  ActiveSupport::Inflector.transliterate(“ü”, locale: :de) # => “ue”
  “Fünf autos”.parameterize(locale: :de) # => “fuenf-autos”
  ActiveSupport::Inflector.parameterize(“Fünf autos”, locale: :de) # => “fuenf-autos”

  Kaan Ozkan, Sharang Dashputre

• Allow Array#excluding and Enumerable#excluding to deal with a passed array gracefully.

  [ 1, 2, 3, 4, 5 ].excluding([4, 5]) # => [ 1, 2, 3 ]

  DHH

• Renamed Array#without and Enumerable#without to Array#excluding and Enumerable#excluding, to create parity with
  Array#including and Enumerable#including. Retained the old names as aliases.

  DHH

• Added Array#including and Enumerable#including to conveniently enlarge a collection with more members using a method rather than an operator:

  [ 1, 2, 3 ].including(4, 5) # => [ 1, 2, 3, 4, 5 ]
  post.authors.including(Current.person) # => All the authors plus the current person!

  DHH

Rails 6.0.0.beta3 (March 11, 2019)

• No changes.

Rails 6.0.0.beta2 (February 25, 2019)

• New autoloading based on Zeitwerk.

  Xavier Noria

• Revise ActiveSupport::Notifications.unsubscribe to correctly handle Regex or other multiple-pattern subscribers.

  Zach Kemp

• Add before_reset callback to CurrentAttributes and define after_reset as an alias of resets for symmetry.

  Rosa Gutierrez

• Remove the Kernel#` override that suppresses ENOENT and accidentally returns nil on Unix systems.

  Akinori Musha

• Add ActiveSupport::HashWithIndifferentAccess#assoc.

  assoc can now be called with either a string or a symbol.

  Stefan Schüßler

• Add Hash#deep_transform_values, and Hash#deep_transform_values!.

  Guillermo Iguaran

Rails 6.0.0.beta1 (January 18, 2019)

• Remove deprecated Module#reachable? method.

  Rafael Mendonça França

• Remove deprecated #acronym_regex method from Inflections.

  Rafael Mendonça França

• Fix String#safe_constantize throwing a LoadError for incorrectly cased constant references.

  Keenan Brock

• Preserve key order passed to ActiveSupport::CacheStore#fetch_multi.

  fetch_multi(*names) now returns its results in the same order as the *names requested, rather than returning cache hits followed by cache misses.

  Gannon McGibbon

• If the same block is included multiple times for a Concern, an exception is no longer raised.

  Mark J. Titorenko, Vlad Bokov

• Fix bug where #to_options for ActiveSupport::HashWithIndifferentAccess
  would not act as alias for #symbolize_keys.

  Nick Weiland

• Improve the logic that detects non-autoloaded constants.

  Jan Habermann, Xavier Noria

• Deprecate ActiveSupport::Multibyte::Unicode#pack_graphemes(array) and ActiveSupport::Multibyte::Unicode#unpack_graphemes(string)
  in favor of array.flatten.pack("U*") and string.scan(/\X/).map(&:codepoints), respectively.

  Francesco Rodríguez

• Deprecate ActiveSupport::Multibyte::Chars.consumes? in favor of String#is_utf8?.

  Francesco Rodríguez

• Fix duration being rounded to a full second.

    time = DateTime.parse("2018-1-1")
    time += 0.51.seconds
  

  Will now correctly add 0.51 second and not 1 full second.

  Edouard Chin

• Deprecate ActiveSupport::Multibyte::Unicode#normalize and ActiveSupport::Multibyte::Chars#normalize
  in favor of String#unicode_normalize

  Francesco Rodríguez

• Deprecate ActiveSupport::Multibyte::Unicode#downcase/upcase/swapcase in favor of
  String#downcase/upcase/swapcase.

  Francesco Rodríguez

• Add ActiveSupport::ParameterFilter.

  Yoshiyuki Kinjo

• Rename Module#parent, Module#parents, and Module#parent_name to
  module_parent, module_parents, and module_parent_name.

  Gannon McGibbon

• Deprecate the use of LoggerSilence in favor of ActiveSupport::LoggerSilence

  Edouard Chin

• Deprecate using negative limits in String#first and String#last.

  Gannon McGibbon, Eric Turner

• Fix bug where #without for ActiveSupport::HashWithIndifferentAccess would fail
  with symbol arguments

  Abraham Chan

• Treat #delete_prefix, #delete_suffix and #unicode_normalize results as non-html_safe.
  Ensure safety of arguments for #insert, #[]= and #replace calls on html_safe Strings.

  Janosch Müller

• Changed ActiveSupport::TaggedLogging.new to return a new logger instance instead
  of mutating the one received as parameter.

  Thierry Joyal

• Define unfreeze_time as an alias of travel_back in ActiveSupport::Testing::TimeHelpers.

  The alias is provided for symmetry with freeze_time.

  Ryan Davidson

• Add support for tracing constant autoloads. Just throw

  ActiveSupport::Dependencies.logger = Rails.logger
  ActiveSupport::Dependencies.verbose = true

  in an initializer.

  Xavier Noria

• Maintain html_safe? on html_safe strings when sliced.

  string = “

  test
  ”.html_safe
  string[-1..1].html_safe? # => true

  Elom Gomez, Yumin Wong

• Add Array#extract!.

  The method removes and returns the elements for which the block returns a true value.
  If no block is given, an Enumerator is returned instead.

  numbers = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
  odd_numbers = numbers.extract! { |number| number.odd? } # => [1, 3, 5, 7, 9]
  numbers # => [0, 2, 4, 6, 8]

  bogdanvlviv

• Support not to cache nil for ActiveSupport::Cache#fetch.

  cache.fetch(‘bar’, skip_nil: true) { nil }
  cache.exist?(‘bar’) # => false

  Martin Hong

• Add “event object” support to the notification system.
  Before this change, end users were forced to create hand made artisanal
  event objects on their own, like this:

  ActiveSupport::Notifications.subscribe(‘wait’) do |*args|
  @event = ActiveSupport::Notifications::Event.new(*args)
  end

  ActiveSupport::Notifications.instrument(‘wait’) do
  sleep 1
  end

  @event.duration # => 1000.138

  After this change, if the block passed to subscribe only takes one
  parameter, the framework will yield an event object to the block. Now
  end users are no longer required to make their own:

  ActiveSupport::Notifications.subscribe(‘wait’) do |event|
  @event = event
  end

  ActiveSupport::Notifications.instrument(‘wait’) do
  sleep 1
  end

  p @event.allocations # => 7
  p @event.cpu_time # => 0.256
  p @event.idle_time # => 1003.2399

  Now you can enjoy event objects without making them yourself. Neat!

  Aaron “t.lo” Patterson

• Add cpu_time, idle_time, and allocations to Event.

  Eileen M. Uchitelle, Aaron Patterson

• RedisCacheStore: support key expiry in increment/decrement.

  Pass :expires_in to #increment and #decrement to set a Redis EXPIRE on the key.

  If the key is already set to expire, RedisCacheStore won’t extend its expiry.

  Rails.cache.increment(“some_key”, 1, expires_in: 2.minutes)

  Jason Lee

• Allow Range#=== and Range#cover? on Range.

  Range#cover? can now accept a range argument like Range#include? and
  Range#===. Range#=== works correctly on Ruby 2.6. Range#include? is moved
  into a new file, with these two methods.

  Requiring active_support/core_ext/range/include_range is now deprecated.
  Use require "active_support/core_ext/range/compare_range" instead.

  utilum

• Add index_with to Enumerable.

  Allows creating a hash from an enumerable with the value from a passed block
  or a default argument.

  %i( title body ).index_with { |attr| post.public_send(attr) }
  # => { title: “hey”, body: “what’s up?” }

  %i( title body ).index_with(nil)
  # => { title: nil, body: nil }

  Closely linked with index_by, which creates a hash where the keys are extracted from a block.

  Kasper Timm Hansen

• Fix bug where ActiveSupport::TimeZone.all would fail when tzinfo data for
  any timezone defined in ActiveSupport::TimeZone::MAPPING is missing.

  Dominik Sander

• Redis cache store: delete_matched no longer blocks the Redis server.
  (Switches from evaled Lua to a batched SCAN + DEL loop.)

  Gleb Mazovetskiy

• Fix bug where ActiveSupport::Cache will massively inflate the storage
  size when compression is enabled (which is true by default). This patch
  does not attempt to repair existing data: please manually flush the cache
  to clear out the problematic entries.

  Godfrey Chan

• Fix bug where URI.unescape would fail with mixed Unicode/escaped character input:

  URI.unescape(“\xe3\x83\x90”) # => “バ”
  URI.unescape(“%E3%83%90”) # => “バ”
  URI.unescape(“\xe3\x83\x90%E3%83%90”) # => Encoding::CompatibilityError

  Ashe Connor, Aaron Patterson

• Add before? and after? methods to Date, DateTime,
  Time, and TimeWithZone.

  Nick Holden

• ActiveSupport::Inflector#ordinal and ActiveSupport::Inflector#ordinalize now support
  translations through I18n.

  # locale/fr.rb

  {
  fr: {
  number: {
  nth: {
  ordinals: lambda do |_key, number:, **_options|
  if number.to_i.abs == 1
  ‘er’
  else
  ‘e’
  end
  end,

  ordinalized: lambda do |_key, number:, **_options|
  “#{number}#{ActiveSupport::Inflector.ordinal(number)}”
  end
  }
  }
  }
  }

  Christian Blais

• Add :private option to ActiveSupport’s Module#delegate
  in order to delegate methods as private:

  class User < ActiveRecord::Base
  has_one :profile
  delegate :date_of_birth, to: :profile, private: true

  def age
  Date.today.year - date_of_birth.year
  end
  end

  # User.new.age # => 29
  # User.new.date_of_birth
  # => NoMethodError: private method `date_of_birth’ called for #

  Tomas Valent

• String#truncate_bytes to truncate a string to a maximum bytesize without
  breaking multibyte characters or grapheme clusters like 👩‍👩‍👦‍👦.

  Jeremy Daer

• String#strip_heredoc preserves frozenness.

  “foo”.freeze.strip_heredoc.frozen? # => true

  Fixes that frozen string literals would inadvertently become unfrozen:

  # frozen_string_literal: true

  foo = <<-MSG.strip_heredoc
  la la la
  MSG

  foo.frozen? # => false !??

  Jeremy Daer

• Rails 6 requires Ruby 2.5.0 or newer.

  Jeremy Daer, Kasper Timm Hansen

• Adds parallel testing to Rails.

  Parallelize your test suite with forked processes or threads.

  Eileen M. Uchitelle, Aaron Patterson

Please check 5-2-stable for previous changes.