Rails 4.0.10 (September 11, 2014)

• Fix DateTime comparison with DateTime::Infinity object.

  Rafael Mendonça França

• Make Dependencies pass a name to NameError error.

  arthurnn, Yuki Nishijima

Rails 4.0.9 (August 18, 2014)

No changes

Rails 4.0.8 (July 2, 2014)

No changes

Rails 4.0.7 (July 2, 2014)

No changes

Rails 4.0.6 (June 26, 2014)

• Hash#deep_transform_keys and Hash#deep_transform_keys! now transform hashes
  in nested arrays. This change also applies to Hash#deep_stringify_keys,
  Hash#deep_stringify_keys!, Hash#deep_symbolize_keys and
  Hash#deep_symbolize_keys!.

  OZAWA Sakuro

• HashWithIndifferentAccess better respects #to_hash on objects it’s
  given. In particular #update, #merge, #replace all accept objects
  which respond to #to_hash, even if those objects are not Hashes directly.

  Currently, if HashWithIndifferentAccess.new is given a non-Hash (even if
  it responds to #to_hash) that object is treated as the default value,
  rather than the initial keys and value. Changing that could break existing
  code, so it will be updated in 4.2.

  Peter Jaros

Rails 4.0.5 (May 6, 2014)

No changes

Rails 4.0.4 (March 14, 2014)

• Fix parsing bugs in XmlMini

  Symbols or boolean parsing would raise an error for non string values (e.g.
  integers). Decimal parsing would fail due to a missing requirement.

  Birkir A. Barkarson

• Re-enable support for iterating over DateTime ranges

  Fixes #13667.

  Prathamesh Sonpatki

• Use remove_possible_method instead of remove_method to avoid
  a NameError to be thrown on FreeBSD with the Date object.

  Rafael Mendonça França, Robin Dupret

• Default the new I18n.enforce_available_locales config to true, meaning
  I18n will make sure that all locales passed to it must be declared in the
  available_locales list.

  To disable it add the following configuration to your application:

  config.i18n.enforce_available_locales = false

  This also ensures I18n configuration is properly initialized taking the new
  option into account, to avoid their deprecations while booting up the app.

  Carlos Antonio da Silva, Yves Senn

• Fix file descriptor being leaked on each call to Kernel.silence_stream.

  Mario Visic

• Fix slice! deleting the default value of the hash.

  Antonio Santos

Rails 4.0.3 (February 18, 2014)

No changes

Rails 4.0.2 (December 02, 2013)

No changes

Rails 4.0.1 (November 01, 2013)

• Disable the ability to iterate over Range of AS::TimeWithZone
  due to significant performance issues.

  Bogdan Gusiev

• Fix ActiveSupport::Cache::FileStore#cleanup to no longer rely on missing each_key method.

  Murray Steele

• Ensure that autoloaded constants in all-caps nestings are marked as
  autoloaded.

  Simon Coffey

• Adds a new deprecation behaviour that raises an exception. Throwing this
  line into config/environments/development.rb:

  ActiveSupport::Deprecation.behavior = :raise

  will cause the application to raise an ActiveSupport::DeprecationException
  on deprecations.

  Use this for aggressive deprecation cleanups.

  Xavier Noria

• Improve ActiveSupport::Cache::MemoryStore cache size calculation.
  The memory used by a key/entry pair is calculated via #cached_size:

  def cached_size(key, entry)
  key.to_s.bytesize + entry.size + PER_ENTRY_OVERHEAD
  end

  The value of PER_ENTRY_OVERHEAD is 240 bytes based on an empirical
  estimation for 64-bit MRI on
  1.9.3 and 2.0.

  Fixes #11512.

  Simeon Simeonov

• Only raise Module::DelegationError if it’s the source of the exception.

  Fixes #10559.

• Add DateTime#usec and DateTime#nsec so that ActiveSupport::TimeWithZone keeps
  sub-second resolution when wrapping a DateTime value.

  Fixes #10855.

  Andrew White

• Make Time.at_with_coercion retain the second fraction and return local time.

  Fixes #11350.

  Neer Friedman, Andrew White

• Fix return value from BacktraceCleaner#noise when the cleaner is configured
  with multiple silencers.

  Fixes #11030.

  Mark J. Titorenko

• Fix ActiveSupport::Dependencies::Loadable#load_dependency calling
  #blame_file! on Exceptions that do not have the Blamable mixin

  Andrew Kreiling

Rails 4.0.0 (June 25, 2013)

• Override Time.at to support the passing of Time-like values when called with a single argument.

  Andrew White

• Allow Date to be compared with Time (like it was possible to compare Time with Date).

  DHH

• Deprecate multiple parameters support of Object#in?.

  Brian Morearty + Carlos Antonio da Silva

• An ActiveSupport::Subscriber class has been extracted from
  ActiveSupport::LogSubscriber, allowing you to use the event attachment
  API for other kinds of subscribers.

  Daniel Schierbeck

• Class#class_attribute accepts an instance_predicate option which
  defaults to true. If set to false the predicate method will not
  be defined.

  Agis Anastasopoulos

• fast_xs support has been removed. Use String#encode(xml: :attr).

• ActiveSupport::Notifications::Instrumenter#instrument should
  yield its payload.

  stopdropandrew

• ActiveSupport::TimeWithZone raises NoMethodError in proper context.
  Fixes #9772.

  Yves Senn

• Fix deletion of empty directories in ActiveSupport::Cache::FileStore.

  Charles Jones

• Improve singularizing a singular for multiple cases.
  Fixes #2608 #1825 #2395.

  Example:

  # Before
  ‘address’.singularize # => ‘addres’

  # After
  ‘address’.singularize # => ‘address’

  Mark McSpadden

• Prevent DateTime#change from truncating the second fraction, when seconds
  do not need to be changed.

  Chris Baynes

• Added ActiveSupport::TimeWithZone#to_r for Time#at compatibility.

  Before this change:

  Time.zone = ‘Tokyo’
  time = Time.zone.now
  time == Time.at(time) # => false

  After the change:

  Time.zone = ‘Tokyo’
  time = Time.zone.now
  time == Time.at(time) # => true

  stopdropandrew

• ActiveSupport::NumberHelper#number_to_human returns the number unaltered when
  the given units hash does not contain the needed key, e.g. when the number provided
  is less than the largest key provided.
  Fixes #9269.

  Examples:

  number_to_human(123, units: {}) # => 123
  number_to_human(123, units: { thousand: ‘k’ }) # => 123

  Michael Hoffman

• Added beginning_of_minute support to core ext calculations for Time and DateTime.

  Gagan Awhad

• Add :nsec date format.

  Jamie Gaskins

• ActiveSupport::Gzip.compress allows two optional arguments for compression
  level and strategy.

  Beyond

• Modify TimeWithZone#as_json to include 3 decimal places of sub-second accuracy
  by default, which is optional as per the ISO8601 spec, but extremely useful. Also
  the default behaviour of Date#toJSON() in recent versions of Chrome, Safari and
  Firefox.

  James Harton

• Improve String#squish to handle Unicode whitespace. Antoine Lyset

• Standardise on to_time returning an instance of Time in the local system timezone
  across String, Time, Date, DateTime and ActiveSupport::TimeWithZone.

  Andrew White

• Extract ActiveSupport::Testing::Performance into https://github.com/rails/rails-perftest
  You can add the gem to your Gemfile to keep using performance tests.

  gem ‘rails-perftest’

  Yves Senn

• Hash.from_xml raises when it encounters type="symbol" or type="yaml".
  Use Hash.from_trusted_xml to parse this XML.

  CVE-2013-0156

  Jeremy Kemper

• Deprecate assert_present and assert_blank in favor of
  assert object.blank? and assert object.present?

  Yves Senn

• Change String#to_date to use Date.parse. This gives more consistent error
  messages and allows the use of partial dates.

  “gibberish”.to_date => Argument Error: invalid date
  “3rd Feb”.to_date => Sun, 03 Feb 2013

  Kelly Stannard

• Remove meaningless ActiveSupport::FrozenObjectError, which was just an alias of RuntimeError.

  Akira Matsuda

• Introduce assert_not to replace warty assert !foo. Jeremy Kemper

• Prevent Callbacks#set_callback from setting the same callback twice.

  before_save :foo, :bar, :foo

  will at first call bar, then foo. foo will no more be called
  twice.

  Dmitriy Kiriyenko

• Add ActiveSupport::Logger#silence that works the same as the old Logger#silence extension.

  DHH

• Remove surrogate unicode character encoding from ActiveSupport::JSON.encode
  The encoding scheme was broken for unicode characters outside the basic multilingual plane;
  since json is assumed to be UTF-8, and we already force the encoding to UTF-8,
  simply pass through the un-encoded characters.

  Brett Carter

• Deprecate Time.time_with_date_fallback, Time.utc_time and Time.local_time.
  These methods were added to handle the limited range of Ruby’s native Time
  implementation. Those limitations no longer apply so we are deprecating them in 4.0
  and they will be removed in 4.1.

  Andrew White

• Deprecate Date#to_time_in_current_zone and add Date#in_time_zone. Andrew White

• Add String#in_time_zone method to convert a string to an ActiveSupport::TimeWithZone. Andrew White

• Deprecate ActiveSupport::BasicObject in favor of ActiveSupport::ProxyObject.
  This class is used for proxy classes. It avoids confusion with Ruby’s BasicObject
  class.

  Francesco Rodriguez

• Patched Marshal#load to work with constant autoloading. Fixes autoloading
  with cache stores that rely on Marshal (MemCacheStore and FileStore).
  Fixes #8167.

  Uriel Katz

• Make Time.zone.parse to work with JavaScript format date strings. Andrew White

• Add DateTime#seconds_until_end_of_day and Time#seconds_until_end_of_day
  as a complement for seconds_from_midnight; useful when setting expiration
  times for caches, e.g.:

  <% cache(‘dashboard’, expires_in: Date.current.seconds_until_end_of_day) do %>
  …

  Olek Janiszewski

• No longer proxy ActiveSupport::Multibyte#class. Steve Klabnik

• Deprecate ActiveSupport::TestCase#pending method, use skip from minitest instead. Carlos Antonio da Silva

• XmlMini.with_backend now may be safely used with threads:

  Thread.new do
  XmlMini.with_backend(“REXML”) { rexml_power }
  end
  Thread.new do
  XmlMini.with_backend(“LibXML”) { libxml_power }
  end

  Each thread will use it’s own backend.

  Nikita Afanasenko

• Dependencies no longer trigger Kernel#autoload in remove_constant. Fixes #8213. Xavier Noria

• Simplify mocha integration and remove monkey-patches, bumping mocha to 0.13.0. James Mead

• #as_json isolates options when encoding a hash. Fixes #8182.

  Yves Senn

• Deprecate Hash#diff in favor of minitest’s #diff. Steve Klabnik

• Kernel#capture can catch output from subprocesses. Dmitry Vorotilin

• to_xml conversions now use builder’s tag! method instead of explicit invocation of method_missing.

  Nikita Afanasenko

• Fixed timezone mapping of the Solomon Islands. Steve Klabnik

• Make callstack attribute optional in ActiveSupport::Deprecation::Reporting
  methods warn and deprecation_warning.

  Alexey Gaziev

• Implement HashWithIndifferentAccess#replace so key? works correctly. David Graham

• Handle the possible permission denied errors atomic.rb might trigger due to its chown
  and chmod calls.

  Daniele Sluijters

• Hash#extract! returns only those keys that present in the receiver.

  {a: 1, b: 2}.extract!(:a, :x) # => {:a => 1}

  Mikhail Dieterle

• Hash#extract! returns the same subclass, that the receiver is. I.e.
  HashWithIndifferentAccess#extract! returns a HashWithIndifferentAccess instance.

  Mikhail Dieterle

• Optimize ActiveSupport::Cache::Entry to reduce memory and processing overhead. Brian Durand

• Tests tag the Rails log with the current test class and test case:

  [SessionsControllerTest] [test_0002_sign in] Processing by SessionsController#create as HTML
  [SessionsControllerTest] [test_0002_sign in] …

  Jeremy Kemper

• Add logger.push_tags and .pop_tags to complement logger.tagged:

  class Job
  def before
  Rails.logger.push_tags :jobs, self.class.name
  end

  def after
  Rails.logger.pop_tags 2
  end
  end

  Jeremy Kemper

• Allow delegation to the class using the :class keyword, replacing
  self.class usage:

  class User
  def self.hello
  “world”
  end

  delegate :hello, to: :class
  end

  Marc-Andre Lafortune

• Date.beginning_of_week thread local and beginning_of_week application
  config option added (default is Monday).

  Innokenty Mikhailov

• An optional block can be passed to config_accessor to set its default value

  class User
  include ActiveSupport::Configurable

  config_accessor :hair_colors do
  [:brown, :black, :blonde, :red]
  end
  end

  User.hair_colors # => [:brown, :black, :blonde, :red]

  Larry Lv

• ActiveSupport::Benchmarkable#silence has been deprecated due to its lack of
  thread safety. It will be removed without replacement in Rails 4.1.

  Steve Klabnik

• An optional block can be passed to Hash#deep_merge. The block will be invoked
  for each duplicated key and used to resolve the conflict.

  Pranas Kiziela

• ActiveSupport::Deprecation is now a class. It is possible to create an instance
  of deprecator. Backwards compatibility has been preserved.

  You can choose which instance of the deprecator will be used.

  deprecate :method_name, deprecator: deprecator_instance

  You can use ActiveSupport::Deprecation in your gem.

  require ‘active_support/deprecation’
  require ‘active_support/core_ext/module/deprecation’

  class MyGem
  def self.deprecator
  ActiveSupport::Deprecation.new(‘2.0’, ‘MyGem’)
  end

  def old_method
  end

  def new_method
  end

  deprecate old_method: :new_method, deprecator: deprecator
  end

  MyGem.new.old_method
  # => DEPRECATION WARNING: old_method is deprecated and will be removed from MyGem 2.0 (use new_method instead). (called from at file.rb:18)

  Piotr Niełacny & Robert Pankowecki

• ERB::Util.html_escape encodes single quote as #39. Decimal form has better support in old browsers. Kalys Osmonov

• ActiveSupport::Callbacks: deprecate monkey patch of object callbacks.
  Using the filter method like this:

  before_filter MyFilter.new

  class MyFilter
  def filter(controller)
  end
  end

  Is now deprecated with recommendation to use the corresponding filter type
  (#before, #after or #around):

  before_filter MyFilter.new

  class MyFilter
  def before(controller)
  end
  end

  Bogdan Gusiev

• An optional block can be passed to HashWithIndifferentAccess#update and #merge.
  The block will be invoked for each duplicated key, and used to resolve the conflict,
  thus replicating the behaviour of the corresponding methods on the Hash class.

  Leo Cassarani

• Remove j alias for ERB::Util#json_escape.
  The j alias is already used for ActionView::Helpers::JavaScriptHelper#escape_javascript
  and both modules are included in the view context that would confuse the developers.

  Akira Matsuda

• Replace deprecated memcache-client gem with dalli in ActiveSupport::Cache::MemCacheStore.

  Guillermo Iguaran

• Add default values to all ActiveSupport::NumberHelper methods, to avoid
  errors with empty locales or missing values.

  Carlos Antonio da Silva

• ActiveSupport::JSON::Variable is deprecated. Define your own #as_json and
  #encode_json methods for custom JSON string literals.

  Erich Menge

• Add String#indent. fxn & Ace Suares

• Inflections can now be defined per locale. singularize and pluralize
  accept locale as an extra argument.

  David Celis

• Object#try will now return nil instead of raise a NoMethodError if the
  receiving object does not implement the method, but you can still get the
  old behavior by using the new Object#try!.

  DHH

• ERB::Util.html_escape now escapes single quotes. Santiago Pastorino

• Time#change now works with time values with offsets other than UTC or the local time zone. Andrew White

• ActiveSupport::Callbacks: deprecate usage of filter object with #before and #after methods as around callback. Bogdan Gusiev

• Add Time#prev_quarter and Time#next_quarter short-hands for months_ago(3) and months_since(3). SungHee Kang

• Remove obsolete and unused require_association method from dependencies. fxn

• Add :instance_accessor option for config_accessor.

  class User
  include ActiveSupport::Configurable
  config_accessor :allowed_access, instance_accessor: false
  end

  User.new.allowed_access = true # => NoMethodError
  User.new.allowed_access # => NoMethodError

  Francesco Rodriguez

• ActionView::Helpers::NumberHelper methods have been moved to ActiveSupport::NumberHelper and are now available via
  Numeric#to_s. Numeric#to_s now accepts the formatting options :phone, :currency, :percentage, :delimited,
  :rounded, :human, and :human_size.

  Andrew Mutz

• Add Hash#transform_keys, Hash#transform_keys!, Hash#deep_transform_keys, and Hash#deep_transform_keys!. Mark McSpadden

• Changed XML type datetime to dateTime (with upper case letter T). Angelo Capilleri

• Add :instance_accessor option for class_attribute. Alexey Vakhov

• constantize now looks in the ancestor chain. Marc-Andre Lafortune & Andrew White

• Adds Hash#deep_stringify_keys and Hash#deep_stringify_keys! to convert all keys from a Hash instance into strings. Lucas Húngaro

• Adds Hash#deep_symbolize_keys and Hash#deep_symbolize_keys! to convert all keys from a Hash instance into symbols. Lucas Húngaro

• Object#try can’t call private methods. Vasiliy Ermolovich

• AS::Callbacks#run_callbacks remove key argument. Francesco Rodriguez

• deep_dup works more expectedly now and duplicates also values in Hash instances and elements in Array instances. Alexey Gaziev

• Inflector no longer applies ice -> ouse to words like “slice”, “police”, etc. Wes Morgan

• Add ActiveSupport::Deprecations.behavior = :silence to completely ignore Rails runtime deprecations. twinturbo

• Make Module#delegate stop using send - can no longer delegate to private methods. dasch

• ActiveSupport::Callbacks: deprecate :rescuable option. Bogdan Gusiev

• Adds Integer#ordinal to get the ordinal suffix string of an integer. Tim Gildea

• ActiveSupport::Callbacks: :per_key option is no longer supported. Bogdan Gusiev

• ActiveSupport::Callbacks#define_callbacks: add :skip_after_callbacks_if_terminated option. Bogdan Gusiev

• Add html_escape_once to ERB::Util, and delegate the escape_once tag helper to it. Carlos Antonio da Silva

• Deprecates the compatibility method Module#local_constant_names,
  use Module#local_constants instead (which returns symbols). Xavier Noria

• Deletes the compatibility method Module#method_names,
  use Module#methods from now on (which returns symbols). Xavier Noria

• Deletes the compatibility method Module#instance_method_names,
  use Module#instance_methods from now on (which returns symbols). Xavier Noria

• BufferedLogger is deprecated. Use ActiveSupport::Logger, or the logger
  from the Ruby standard library.

  Aaron Patterson

• Unicode database updated to 6.1.0. Norman Clarke

• Adds encode_big_decimal_as_string option to force JSON serialization of BigDecimal as numeric instead
  of wrapping them in strings for safety.

• Optimize log subscribers to check log level before doing any processing. Brian Durand

Please check 3-2-stable for previous changes.