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  • DateTime#to_f now preserves the fractional seconds instead of always rounding to .0.

    Fixes #15994.

    John Paul Ashenfelter

  • Add Hash#transform_values to simplify a common pattern where the values of a hash must change, but the keys are left the same.

    Sean Griffin

  • Always instrument ActiveSupport::Cache.

    Since ActiveSupport::Notifications only instrument items when there are subscriber we don't need to disable instrumentation.

    Peter Wagenet

  • Make the apply_inflections method case-insensitive when checking whether a word is uncountable or not.

    Robin Dupret

  • Make Dependencies pass a name to NameError error.


  • Fixed ActiveSupport::Cache::FileStore exploding with long paths.

    Adam Panzer / Michael Grosser

  • Fixed ActiveSupport::TimeWithZone#- so precision is not unnecessarily lost when working with objects with a nanosecond component.

    ActiveSupport::TimeWithZone#- should return the same result as if we were using Time#-: - #=> 86399.999999999

    Before: #=> 999999999 - #=> 86400.0

    After: -
    #=> 86399.999999999

    Gordon Chan

  • Fixed precision error in NumberHelper when using Rationals.


    ActiveSupport::NumberHelper.number_to_rounded Rational(1000, 3), precision: 2
    #=> "330.00"


    ActiveSupport::NumberHelper.number_to_rounded Rational(1000, 3), precision: 2
    #=> "333.33"

    See #15379.

    Juanjo Bazán

  • Removed deprecated Numeric#ago and friends


    5.ago   => 5.seconds.ago
    5.until => 5.seconds.until
    5.since => 5.seconds.since
    5.from_now => 5.seconds.from_now

    See #12389 for the history and rationale behind this.

    Godfrey Chan

  • DateTime advance now supports partial days.

    Before: 1, hours: 12)

    After: 1.5)

    Fixes #12005.

    Shay Davidson

  • 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

  • Fixed confusing DelegationError in Module#delegate.

    See #15186.

    Vladimir Yarotsky

  • Fixed ActiveSupport::Subscriber so that no duplicate subscriber is created when a subscriber method is redefined.

    Dennis Schön

  • Remove deprecated string based terminators for ActiveSupport::Callbacks.

    Eileen M. Uchitelle

  • Fixed an issue when using ActiveSupport::NumberHelper::NumberToDelimitedConverter to convert a value that is an ActiveSupport::SafeBuffer introduced in 2da9d67.

    See #15064.

    Mark J. Titorenko

  • TimeZone#parse defaults the day of the month to '1' if any other date components are specified. This is more consistent with the behavior of Time#parse.

    Ulysse Carion

  • humanize strips leading underscores, if any.


    '_id'.humanize # => ""


    '_id'.humanize # => "Id"

    Xavier Noria

  • Fixed backward compatibility isues introduced in 326e652.

    Empty Hash or Array should not present in serialization result.

    {a: []}.to_query # => ""
    {a: {}}.to_query # => ""

    For more info see #14948.

    Bogdan Gusiev

  • Add SecureRandom::uuid_v3 and SecureRandom::uuid_v5 to support stable UUID fixtures on PostgreSQL.

    Roderick van Domburg

  • Fixed ActiveSupport::Duration#eql? so that 1.second.eql?(1.second) is true.

    This fixes the current situation of:

    1.second.eql?(1.second) #=> false

    eql? also requires that the other object is an ActiveSupport::Duration. This requirement makes ActiveSupport::Duration's behavior consistent with the behavior of Ruby's numeric types:

    1.eql?(1.0) #=> false
    1.0.eql?(1) #=> false
    1.second.eql?(1) #=> false (was true)
    1.eql?(1.second) #=> false
    { 1 => "foo", 1.0 => "bar" }
    #=> { 1 => "foo", 1.0 => "bar" }
    { 1 => "foo", 1.second => "bar" }
    # now => { 1 => "foo", 1.second => "bar" }
    # was => { 1 => "bar" }

    And though the behavior of these hasn't changed, for reference:

    1 == 1.0 #=> true
    1.0 == 1 #=> true
    1 == 1.second #=> true
    1.second == 1 #=> true

    Emily Dobervich

  • ActiveSupport::SafeBuffer#prepend acts like String#prepend and modifies instance in-place, returning self. ActiveSupport::SafeBuffer#prepend! is deprecated.

    Pavel Pravosud

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

    Peter Jaros

  • Deprecate Class#superclass_delegating_accessor, use Class#class_attribute instead.

    Akshay Vishnoi

  • Ensure classes which include Enumerable get #to_json in addition to #as_json.

    Sammy Larbi

  • Change the signature of fetch_multi to return a hash rather than an array. This makes it consistent with the output of read_multi.

    Parker Selbert

  • Introduce Concern#class_methods as a sleek alternative to clunky module ClassMethods. Add Kernel#concern to define at the toplevel without chunky module Foo; extend ActiveSupport::Concern boilerplate.

    # app/models/concerns/authentication.rb
    concern :Authentication do
      included do
        after_create :generate_private_key
      class_methods do
        def authenticate(credentials)
          # ...
      def generate_private_key
        # ...
    # app/models/user.rb
    class User < ActiveRecord::Base
      include Authentication

    Jeremy Kemper

Please check 4-1-stable for previous changes.

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