Rails
Rails adds ActiveRecord API for switching multiple database connections
Rails adds ActiveRecord API connects_to and connected_to for switching connections to support multiple databases.Rails introduces disallowed deprecations in ActiveSupport
Rails has added support to configure disallowed deprecations.Rails has added a benchmark generator
Rails has added a benchmark generator for scripts to benchmark Rails application.Rails adds support for if_exists/if_not_exists on remove_column/add_column in migrations
Rails adds support for if_exists/if_not_exists on remove_column/add_column in migrations to silently ignore migrationsRails 6 adds rails db:system:change command
Rails 6 adds rails db:system:change command to allow switching database configurationRails 6 - ActiveSupport Deprecations in Unicode and Chars support in favour of String
Rails 6 has deprecated methods in Unicode and Chars support for ActiveSupport in favor of using ruby 2.3+ String methods directly.Rails 6.1 adds support for multiple storage services to Active Storage
Rails 6.1 adds support to configure storage services for individual attachment.Rails adds ActiveRecord::Relation#annotate for adding SQL comments to ActiveRecord::Relation queries
Rails adds ActiveRecord::Relation#annotate for adding SQL comments to ActiveRecord::Relation queriesRails 6.1 adds query method missing to find orphan records
Rails 6.1 adds ActiveRecord::Relation#missing query method to find orphan recordsWebpacker is the new default in Rails 6
Webpacker is the new default JavaScript compiler instead of Sprockets in Rails 6