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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 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

    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 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).


  • 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.


  • 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.


    # 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: = 'Tokyo'
    time =
    time == # => false

    After the change: = 'Tokyo'
    time =
    time == # => true


  • 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.


    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.


  • 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 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.


    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.


  • 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 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: do
      XmlMini.with_backend("REXML") { rexml_power }
    end do
      XmlMini.with_backend("LibXML") { libxml_power }

    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,
      def after
        Rails.logger.pop_tags 2

    Jeremy Kemper

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

    class User
      def self.hello
      delegate :hello, to: :class

    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]
    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'2.0', 'MyGem')
      def old_method
      def new_method
      deprecate old_method: :new_method, deprecator: deprecator
    # => DEPRECATION WARNING: old_method is deprecated and will be removed from MyGem 2.0 (use new_method instead). (called from <main> 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:

    class MyFilter
      def filter(controller)

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

    class MyFilter
      def before(controller)

    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!.


  • 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 = true # => NoMethodError        # => 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.

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