rails--rails/activesupport/CHANGELOG.md

Rails 6.0.0.alpha (Unreleased)

• Caching: MemCache and Redis read_multi and fetch_multi speedup. Read from the local in-memory cache before consulting the backend.

  Gabriel Sobrinho

• Return all mappings for a timezone identifier in country_zones

  Some timezones like Europe/London have multiple mappings in ActiveSupport::TimeZone::MAPPING so return all of them instead of the first one found by using Hash#value. e.g:

  # Before
  ActiveSupport::TimeZone.country_zones("GB") # => ["Edinburgh"]
  
  # After
  ActiveSupport::TimeZone.country_zones("GB") # => ["Edinburgh", "London"]
  

  Fixes #31668.

  Andrew White

• String#truncate_bytes to truncate a string to a maximum bytesize without breaking multibyte characters or grapheme clusters like 👩‍👩‍👦‍👦.

  Jeremy Daer

• String#strip_heredoc preserves frozenness.

  "foo".freeze.strip_heredoc.frozen?  # => true
  

  Fixes that frozen string literals would inadvertently become unfrozen:

  # frozen_string_literal: true
  
  foo = <<-MSG.strip_heredoc
    la la la
  MSG
  
  foo.frozen?  # => false !??
  

  Jeremy Daer

• Rails 6 requires Ruby 2.4.1 or newer.

  Jeremy Daer

• Adds parallel testing to Rails

  Parallelize your test suite with forked processes or threads.

  Eileen M. Uchitelle, Aaron Patterson

Please check 5-2-stable for previous changes.