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  • 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, returning false in an ActiveSupport callback had the side effect of halting the callback chain. This is not recommended anymore and, depending on the value of Callbacks::CallbackChain.halt_and_display_warning_on_return_false, will either not work at all or display a deprecation warning.

  • Add Callbacks::CallbackChain.halt_and_display_warning_on_return_false

    Setting Callbacks::CallbackChain.halt_and_display_warning_on_return_false to true will let an app support the deprecated way of halting callback chains by returning false.

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

    The value can also be set with the Rails configuration option config.active_support.halt_callback_chains_on_return_false.

    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.


  • 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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