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  • blank? and present? commit to return singletons.

    Xavier Noria, Pavel Pravosud

  • Fixed Float related error in NumberHelper with large precisions.

    before: ActiveSupport::NumberHelper.number_to_rounded '3.14159', precision: 50 #=> "3.14158999999999988261834005243144929409027099609375" after: ActiveSupport::NumberHelper.number_to_rounded '3.14159', precision: 50 #=> "3.14159000000000000000000000000000000000000000000000"

    Kenta Murata, Akira Matsuda

  • 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

  • Introduce Module#concerning: a natural, low-ceremony way to separate responsibilities within a class.

    Imported from

    class Todo < ActiveRecord::Base
      concerning :EventTracking do
        included do
          has_many :events
        def latest_event
          def some_internal_method
      concerning :Trashable do
        def trashed?
        def latest_event
          super some_option: true

    is equivalent to defining these modules inline, extending them into concerns, then mixing them in to the class.

    Inline concerns tame "junk drawer" classes that intersperse many unrelated class-level declarations, public instance methods, and private implementation. Coalesce related bits and give them definition. These are a stepping stone toward future growth & refactoring.

    When to move on from an inline concern:

    • Encapsulating state? Extract collaborator object.
    • Encompassing more public behavior or implementation? Move to separate file.
    • Sharing behavior among classes? Move to separate file.

    Jeremy Kemper

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

    Mario Visic

  • Added Date#all_week/month/quarter/year for generating date ranges.

    Dmitriy Meremyanin

  • Add and These follow the behavior of Ruby's Date.yesterday and Date.tomorrow but return localized versions, similar to how has returned a localized version of

    Colin Bartlett

  • Show valid keys when assert_valid_keys raises an exception, and show the wrong value as it was entered.

    Gonzalo Rodríguez-Baltanás Díaz

  • Both cattr_* and mattr_* method definitions now live in active_support/core_ext/module/attribute_accessors.

    Requires to active_support/core_ext/class/attribute_accessors are deprecated and will be removed in Ruby on Rails 4.2.

    Genadi Samokovarov

  • Deprecated Numeric#{ago,until,since,from_now}, the user is expected to explicitly convert the value into an AS::Duration, i.e. 5.ago => 5.seconds.ago

    This will help to catch subtle bugs like:

    def recent?(days = 3)
      self.created_at >= days.ago

    The above code would check if the model is created within the last 3 seconds.

    In the future, Numeric#{ago,until,since,from_now} should be removed completely, or throw some sort of errors to indicate there are no implicit conversion from Numeric to AS::Duration.

    Godfrey Chan

  • Requires JSON gem version 1.7.7 or above due to a security issue in older versions.

    Godfrey Chan

  • Removed the old pure-Ruby JSON encoder and switched to a new encoder based on the built-in JSON gem.

    Support for encoding BigDecimal as a JSON number, as well as defining custom encode_json methods to control the JSON output has been removed from core. The new encoder will always encode BigDecimals as Strings and ignore any custom encode_json methods.

    The old encoder has been extracted into the activesupport-json_encoder gem. Installing that gem will bring back the ability to encode BigDecimals as numbers as well as encode_json support.

    Setting the related configuration ActiveSupport.encode_big_decimal_as_string without the activesupport-json_encoder gem installed will raise an error.

    Godfrey Chan

  • Add ActiveSupport::Testing::TimeHelpers#travel and #travel_to. These methods change current time to the given time or time difference by stubbing and to return the time or date after the difference calculation, or the time or date that got passed into the method respectively.

    Example for #travel: # => 2013-11-09 15:34:49 -05:00
    travel # => 2013-11-10 15:34:49 -05:00 # => Sun, 10 Nov 2013

    Example for #travel_to: # => 2013-11-09 15:34:49 -05:00
    travel_to, 11, 24, 01, 04, 44) # => 2004-11-24 01:04:44 -05:00 # => Wed, 24 Nov 2004

    Both of these methods also accept a block, which will return the current time back to its original state at the end of the block: # => 2013-11-09 15:34:49 -05:00
    travel do
      User.create.created_at # => Sun, 10 Nov 2013 15:34:49 EST -05:00
    travel_to, 11, 24, 01, 04, 44) do
      User.create.created_at # => Wed, 24 Nov 2004 01:04:44 EST -05:00
    end # => 2013-11-09 15:34:49 -05:00

    This module is included in ActiveSupport::TestCase automatically.

    Prem Sichanugrist, DHH

  • Unify cattr_* interface: allow to pass a block to cattr_reader.


    class A
      cattr_reader(:defr) { 'default_reader_value' }
    A.defr # => 'default_reader_value'

    Alexey Chernenkov

  • Improved compatibility with the stdlib JSON gem.

    Previously, calling ::JSON.{generate,dump} sometimes causes unexpected failures such as intridea/multi_json#86.

    ::JSON.{generate,dump} now bypasses the ActiveSupport JSON encoder completely and yields the same result with or without ActiveSupport. This means that it will not call as_json and will ignore any options that the JSON gem does not natively understand. To invoke ActiveSupport's JSON encoder instead, use obj.to_json(options) or ActiveSupport::JSON.encode(obj, options).

    Godfrey Chan

  • Fix Active Support Time#to_json and DateTime#to_json to return 3 decimal places worth of fractional seconds, similar to TimeWithZone.

    Ryan Glover

  • Removed circular reference protection in JSON encoder, deprecated ActiveSupport::JSON::Encoding::CircularReferenceError.

    Godfrey Chan, Sergio Campamá

  • Add capitalize option to Inflector.humanize, so strings can be humanized without being capitalized:

    'employee_salary'.humanize                    # => "Employee salary"
    'employee_salary'.humanize(capitalize: false) # => "employee salary"


  • Fixed Object#as_json and Struct#as_json not working properly with options. They now take the same options as Hash#as_json:

    struct =, :bar).new = "hello" = "world"
    json = struct.as_json(only: [:foo]) # => {foo: "hello"}

    Sergio Campamá, Godfrey Chan

  • Added Numeric#in_milliseconds, like 1.hour.in_milliseconds, so we can feed them to JavaScript functions like getTime().


  • Calling ActiveSupport::JSON.decode with unsupported options now raises an error.

    Godfrey Chan

  • Support :unless_exist in FileStore.

    Michael Grosser

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

    Antonio Santos

  • require_dependency accepts objects that respond to to_path, in particular Pathname instances.

    Benjamin Fleischer

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

    Bogdan Gusiev

  • Allow attaching event subscribers to ActiveSupport::Notifications namespaces before they're defined. Essentially, this means instead of this:

    class JokeSubscriber < ActiveSupport::Subscriber
      def sql(event)
        puts "A rabbi and a priest walk into a bar..."
      # This call needs to happen *after* defining the methods.
      attach_to "active_record"

    You can do this:

    class JokeSubscriber < ActiveSupport::Subscriber
      # This is much easier to read!
      attach_to "active_record"
      def sql(event)
        puts "A rabbi and a priest walk into a bar..."

    This should make it easier to read and understand these subscribers.

    Daniel Schierbeck

  • Add Date#middle_of_day, DateTime#middle_of_day and Time#middle_of_day methods.

    Also added midday, noon, at_midday, at_noon and at_middle_of_day as aliases.

    Anatoli Makarevich

  • 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

  • Add String#remove(pattern) as a short-hand for the common pattern of String#gsub(pattern, '').


  • 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

  • Remove 'cow' => 'kine' irregular inflection from default inflections.

    Andrew White

  • Add DateTime#to_s(:iso8601) and Date#to_s(:iso8601) for consistency.

    Andrew White

  • Add Time#to_s(:iso8601) for easy conversion of times to the iso8601 format for easy Javascript date parsing.


  • 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. GH#11512

    Simeon Simeonov

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

    Fixes #10559

    Andrew White

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

    Fixes #11350

    Neer Friedman, Andrew White

  • Make HashWithIndifferentAccess#select always return the hash, even when Hash#select! returns nil, to allow further chaining.

    Marc Schütz

  • Remove deprecated String#encoding_aware? core extensions (core_ext/string/encoding).

    Arun Agrawal

  • Remove deprecated Module#local_constant_names in favor of Module#local_constants.

    Arun Agrawal

  • Remove deprecated DateTime.local_offset in favor of DateTime.civil_from_format.

    Arun Agrawal

  • Remove deprecated Logger core extensions (core_ext/logger.rb).

    Carlos Antonio da Silva

  • Remove deprecated Time#time_with_datetime_fallback, Time#utc_time and Time#local_time in favor of Time#utc and Time#local.

    Vipul A M

  • Remove deprecated Hash#diff with no replacement.

    If you're using it to compare hashes for the purpose of testing, please use MiniTest's assert_equal instead.

    Carlos Antonio da Silva

  • Remove deprecated Date#to_time_in_current_zone in favor of Date#in_time_zone.

    Vipul A M

  • Remove deprecated Proc#bind with no replacement.

    Carlos Antonio da Silva

  • Remove deprecated Array#uniq_by and Array#uniq_by!, use native Array#uniq and Array#uniq! instead.

    Carlos Antonio da Silva

  • Remove deprecated ActiveSupport::BasicObject, use ActiveSupport::ProxyObject instead.

    Carlos Antonio da Silva

  • Remove deprecated BufferedLogger, use ActiveSupport::Logger instead.

    Yves Senn

  • Remove deprecated assert_present and assert_blank methods, use assert object.blank? and assert object.present? instead.

    Yves Senn

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

    Fixes #11030

    Mark J. Titorenko

  • HashWithIndifferentAccess#select now returns a HashWithIndifferentAccess instance instead of a Hash instance.

    Fixes #10723

    Albert Llop

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

    Fixes #10855

    Andrew White

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

    Andrew Kreiling

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

    Andrew White

  • Prevent side effects to hashes inside arrays when Hash#with_indifferent_access is called.

    Fixes #10526

    Yves Senn

  • Removed deprecated ActiveSupport::JSON::Variable with no replacement.

    Toshinori Kajihara

  • Raise an error when multiple included blocks are defined for a Concern. The old behavior would silently discard previously defined blocks, running only the last one.

    Mike Dillon

  • Replace multi_json with json.

    Since Rails requires Ruby 1.9 and since Ruby 1.9 includes json in the standard library, multi_json is no longer necessary.

    Erik Michaels-Ober

  • Added escaping of U+2028 and U+2029 inside the json encoder. These characters are legal in JSON but break the Javascript interpreter. After escaping them, the JSON is still legal and can be parsed by Javascript.

    Mario Caropreso + Viktor Kelemen + zackham

  • Fix skipping object callbacks using metadata fetched via callback chain inspection methods (_*_callbacks)

    Sean Walbran

  • Add a fetch_multi method to the cache stores. The method provides an easy to use API for fetching multiple values from the cache.


    # Calculating scores is expensive, so we only do it for posts
    # that have been updated. Cache keys are automatically extracted
    # from objects that define a #cache_key method.
    scores = Rails.cache.fetch_multi(*posts) do |post|

    Daniel Schierbeck

Please check 4-0-stable for previous changes.

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