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  • ActiveSupport::Cache::Store#namespaced_key, ActiveSupport::Cache::MemCachedStore#escape_key, and ActiveSupport::Cache::FileStore#key_file_path are deprecated and replaced with normalize_key that now calls super.

    ActiveSupport::Cache::LocaleCache#set_cache_value is deprecated and replaced with write_cache_value.

    Michael Grosser

  • Implements an evented file system monitor to asynchronously detect changes in the application source code, routes, locales, etc.

    To opt-in load the listen gem in Gemfile:

    group :development do
      gem 'listen', '~> 3.0.4'

    Puneet Agarwal and Xavier Noria

  • Added Time.days_in_year to return the number of days in the given year, or the current year if no argument is provided.

    Jon Pascoe

  • Updated parameterize to preserve the case of a string, optionally.


    parameterize("Donald E. Knuth", separator: '_') # => "donald_e_knuth"
    parameterize("Donald E. Knuth", preserve_case: true) # => "Donald-E-Knuth"

    Swaathi Kakarla

  • respects the default value or proc on objects that respond to #to_hash. .new_from_hash_copying_default simply invokes .new. All calls to .new_from_hash_copying_default are replaced with .new.

    Gordon Chan

  • Change Integer#year to return a Fixnum instead of a Float to improve consistency.

    Integer#years returned a Float while the rest of the accompanying methods (days, weeks, months, etc.) return a Fixnum.


    1.year # => 31557600.0


    1.year # => 31557600

    Konstantinos Rousis

  • Handle invalid UTF-8 strings when HTML escaping

    Use ActiveSupport::Multibyte::Unicode.tidy_bytes to handle invalid UTF-8 strings in ERB::Util.unwrapped_html_escape and ERB::Util.html_escape_once. Prevents user-entered input passed from a querystring into a form field from causing invalid byte sequence errors.

    Grey Baker

  • Update ActiveSupport::Multibyte::Chars#slice! to return nil if the arguments are out of bounds, to mirror the behavior of String#slice!

    Gourav Tiwari

  • Fix number_to_human so that 999999999 rounds to "1 Billion" instead of "1000 Million".

    Max Jacobson

  • Fix ActiveSupport::Deprecation#deprecate_methods to report using the current deprecator instance, where applicable.

    Brandon Dunne

  • Cache#fetch instrumentation marks whether it was a :hit.

    Robin Clowers

  • assert_difference and assert_no_difference now returns the result of the yielded block.


    post = assert_difference -> { Post.count }, 1 do Post.create end

    Lucas Mazza

  • Short-circuit blank? on date and time values since they are never blank.

    Fixes #21657

    Andrew White

  • Replaced deprecated ThreadSafe::Cache with its successor Concurrent::Map now that the thread_safe gem has been merged into concurrent-ruby.

    Jerry D'Antonio

  • Updated Unicode version to 8.0.0

    Anshul Sharma

  • number_to_currency and number_with_delimiter now accept custom delimiter_pattern option to handle placement of delimiter, to support currency formats like INR


    number_to_currency(1230000, delimiter_pattern: /(\d+?)(?=(\d\d)+(\d)(?!\d))/, unit: '₹', format: "%u %n")
    # => '₹ 12,30,000.00'

    Vipul A M

  • Deprecate :prefix option of number_to_human_size with no replacement.

    Jean Boussier

  • Fix TimeWithZone#eql? to properly handle TimeWithZone created from DateTime: twz = twz.eql?(twz.dup) => true

    Fixes #14178.

    Roque Pinel

  • ActiveSupport::HashWithIndifferentAccess select and reject will now return enumerator if called without block.

    Fixes #20095

    Bernard Potocki

  • Removed ActiveSupport::Concurrency::Latch, superseded by Concurrent::CountDownLatch from the concurrent-ruby gem.

    Jerry D'Antonio

  • Fix not calling #default on HashWithIndifferentAccess#to_hash when only default_proc is set, which could raise.

    Simon Eskildsen

  • Fix setting default_proc on HashWithIndifferentAccess#dup

    Simon Eskildsen

  • Fix a range of values for parameters of the Time#change

    Nikolay Kondratyev

  • Add Enumerable#pluck to get the same values from arrays as from ActiveRecord associations.

    Fixes #20339.

    Kevin Deisz

  • Add a bang version to ActiveSupport::OrderedOptions get methods which will raise an KeyError if the value is .blank?


    if (slack_url = Rails.application.secrets.slack_url).present?
      # Do something worthwhile
      # Raise as important secret password is not specified


    slack_url = Rails.application.secrets.slack_url!

    Aditya Sanghi, Gaurish Sharma

  • Remove deprecated Class#superclass_delegating_accessor. Use Class#class_attribute instead.

    Akshay Vishnoi

  • Patch Delegator to work with #try.

    Fixes #5790.

    Nate Smith

  • Add Integer#positive? and Integer#negative? query methods in the vein of Fixnum#zero?.

    This makes it nicer to do things like


  • Encoding ActiveSupport::TimeWithZone to YAML now preserves the timezone information.

    Fixes #9183.

    Andrew White

  • Added ActiveSupport::TimeZone#strptime to allow parsing times as if from a given timezone.

    Paul A Jungwirth

  • ActiveSupport::Callbacks#skip_callback now raises an ArgumentError if an unrecognized callback is removed.

    Iain Beeston

  • Added ActiveSupport::ArrayInquirer and Array#inquiry.

    Wrapping an array in an ArrayInquirer gives a friendlier way to check its contents:

    variants =[:phone, :tablet])    # => true
    variants.tablet?   # => true
    variants.desktop?  # => false
    variants.any?(:phone, :tablet)   # => true
    variants.any?(:phone, :desktop)  # => true
    variants.any?(:desktop, :watch)  # => false

    Array#inquiry is a shortcut for wrapping the receiving array in an ArrayInquirer.

    George Claghorn

  • Deprecate alias_method_chain in favour of Module#prepend introduced in Ruby 2.0.

    Kir Shatrov

  • Added #without on Enumerable and Array to return a copy of an enumerable without the specified elements.

    Todd Bealmear

  • Fixed a problem where String#truncate_words would get stuck with a complex string.

    Henrik Nygren

  • Fixed a roundtrip problem with AS::SafeBuffer where primitive-like strings will be dumped as primitives:


    YAML.load"Hello").to_yaml  # => "Hello"
    YAML.load"true").to_yaml   # => true
    YAML.load"false").to_yaml  # => false
    YAML.load"1").to_yaml      # => 1
    YAML.load"1.1").to_yaml    # => 1.1


    YAML.load"Hello").to_yaml  # => "Hello"
    YAML.load"true").to_yaml   # => "true"
    YAML.load"false").to_yaml  # => "false"
    YAML.load"1").to_yaml      # => "1"
    YAML.load"1.1").to_yaml    # => "1.1"

    Godfrey Chan

  • Enable number_to_percentage to keep the number's precision by allowing :precision to be nil.

    Jack Xu

  • config_accessor became a private method, as with Ruby's attr_accessor.

    Akira Matsuda

  • AS::Testing::TimeHelpers#travel_to now changes as well as and

    Yuki Nishijima

  • Add file_fixture to ActiveSupport::TestCase. It provides a simple mechanism to access sample files in your test cases.

    By default file fixtures are stored in test/fixtures/files. This can be configured per test-case using the file_fixture_path class attribute.

    Yves Senn

  • Return value of yielded block in File.atomic_write.

    Ian Ker-Seymer

  • Duplicate frozen array when assigning it to a HashWithIndifferentAccess so that it doesn't raise a RuntimeError when calling map! on it in convert_value.

    Fixes #18550.

    Aditya Kapoor

  • Add missing time zone definitions for Russian Federation and sync them with file from tzdata version 2014j (latest).

    Andrey Novikov

  • Add SecureRandom.base58 for generation of random base58 strings.

    Matthew Draper, Guillermo Iguaran

  • Add #prev_day and #next_day counterparts to #yesterday and #tomorrow for Date, Time, and DateTime.

    George Claghorn

  • Add same_time option to #next_week and #prev_week for Date, Time, and DateTime.

    George Claghorn

  • Add #on_weekend?, #next_weekday, #prev_weekday methods to Date, Time, and DateTime.

    #on_weekend? returns true if the receiving date/time falls on a Saturday or Sunday.

    #next_weekday returns a new date/time representing the next day that does not fall on a Saturday or Sunday.

    #prev_weekday returns a new date/time representing the previous day that does not fall on a Saturday or Sunday.

    George Claghorn

  • Change the default test order from :sorted to :random.

    Rafael Mendonça França

  • Remove deprecated ActiveSupport::JSON::Encoding::CircularReferenceError.

    Rafael Mendonça França

  • Remove deprecated methods ActiveSupport::JSON::Encoding.encode_big_decimal_as_string= and ActiveSupport::JSON::Encoding.encode_big_decimal_as_string.

    Rafael Mendonça França

  • Remove deprecated ActiveSupport::SafeBuffer#prepend.

    Rafael Mendonça França

  • Remove deprecated methods at Kernel.

    silence_stderr, silence_stream, capture and quietly.

    Rafael Mendonça França

  • Remove deprecated active_support/core_ext/big_decimal/yaml_conversions file.

    Rafael Mendonça França

  • Remove deprecated methods ActiveSupport::Cache::Store.instrument and ActiveSupport::Cache::Store.instrument=.

    Rafael Mendonça França

  • Change the way in which callback chains can be halted.

    The preferred method to halt a callback chain from now on is to explicitly throw(:abort). In the past, callbacks could only be halted by explicitly providing a terminator and by having a callback match the conditions of the terminator.

  • Add ActiveSupport.halt_callback_chains_on_return_false

    Setting ActiveSupport.halt_callback_chains_on_return_false to true will let an app support the deprecated way of halting Active Record, and Active Model callback chains by returning false.

    Setting the value to false will tell the app to ignore any false value returned by those callbacks, and only halt the chain upon throw(:abort).

    When the configuration option is missing, its value is true, so older apps ported to Rails 5.0 will not break (but display a deprecation warning). For new Rails 5.0 apps, its value is set to false in an initializer, so these apps will support the new behavior by default.

    claudiob, Roque Pinel

  • Changes arguments and default value of CallbackChain's :terminator option

    Chains of callbacks defined without an explicit :terminator option will now be halted as soon as a before_ callback throws :abort.

    Chains of callbacks defined with a :terminator option will maintain their existing behavior of halting as soon as a before_ callback matches the terminator's expectation.


  • Deprecate MissingSourceFile in favor of LoadError.

    MissingSourceFile was just an alias to LoadError and was not being raised inside the framework.

    Rafael Mendonça França

  • Add support for error dispatcher classes in ActiveSupport::Rescuable. Now it acts closer to Ruby's rescue.


    class BaseController < ApplicationController
      module ErrorDispatcher
        def self.===(other)
          Exception === other && other.respond_to?(:status)
      rescue_from ErrorDispatcher do |error|
        render status: error.status, json: { error: error.to_s }

    Genadi Samokovarov

  • Add #verified and #valid_message? methods to ActiveSupport::MessageVerifier

    Previously, the only way to decode a message with ActiveSupport::MessageVerifier was to use #verify, which would raise an exception on invalid messages. Now #verified can also be used, which returns nil on messages that cannot be decoded.

    Previously, there was no way to check if a message's format was valid without attempting to decode it. #valid_message? is a boolean convenience method that checks whether the message is valid without actually decoding it.

    Logan Leger

Please check 4-2-stable for previous changes.

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