2014-05-24 17:03:53 -04:00
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Ruby on Rails 4.2 Release Notes
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===============================
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Highlights in Rails 4.2:
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These release notes cover only the major changes. To know about various bug
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fixes and changes, please refer to the change logs or check out the
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[list of commits](https://github.com/rails/rails/commits/master) in the main
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Rails repository on GitHub.
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--------------------------------------------------------------------------------
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Upgrading to Rails 4.2
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----------------------
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If you're upgrading an existing application, it's a great idea to have good test
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coverage before going in. You should also first upgrade to Rails 4.1 in case you
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haven't and make sure your application still runs as expected before attempting
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an update to Rails 4.2. A list of things to watch out for when upgrading is
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available in the
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[Upgrading Ruby on Rails](upgrading_ruby_on_rails.html#upgrading-from-rails-4-1-to-rails-4-2)
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guide.
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Major Features
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--------------
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2014-06-12 02:42:00 -04:00
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### Foreign key support
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The migration DSL now supports adding and removing foreign keys. They are dumped
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to `schema.rb` as well. At this time, only the `mysql`, `mysql2` and `postgresql`
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adapters support foreign keys.
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```ruby
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# add a foreign key to `articles.author_id` referencing `authors.id`
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add_foreign_key :articles, :authors
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# add a foreign key to `articles.author_id` referencing `users.lng_id`
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add_foreign_key :articles, :users, column: :author_id, primary_key: "lng_id"
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# remove the foreign key on `accounts.branch_id`
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remove_foreign_key :accounts, :branches
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# remove the foreign key on `accounts.owner_id`
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remove_foreign_key :accounts, column: :owner_id
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```
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See the API documentation on
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[add_foreign_key](http://api.rubyonrails.org/v4.2.0/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-add_foreign_key)
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and
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[remove_foreign_key](http://api.rubyonrails.org/v4.2.0/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-remove_foreign_key)
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for a full description.
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2014-05-24 17:03:53 -04:00
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Railties
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--------
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2014-07-06 00:15:33 -04:00
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Please refer to the [Changelog][railties] for detailed changes.
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2014-05-24 17:03:53 -04:00
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### Removals
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2014-07-13 20:23:32 -04:00
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* The `rails application` command has been removed without replacement.
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([Pull Request](https://github.com/rails/rails/pull/11616))
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2014-05-24 17:03:53 -04:00
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2014-07-11 05:15:00 -04:00
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### Deprecations
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2014-07-13 20:23:32 -04:00
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* Deprecated `Rails::Rack::LogTailer` without replacement.
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([Commit](https://github.com/rails/rails/commit/84a13e019e93efaa8994b3f8303d635a7702dbce))
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2014-07-11 05:15:00 -04:00
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2014-05-24 17:03:53 -04:00
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### Notable changes
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2014-07-13 20:23:32 -04:00
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* Introduced `--skip-gems` option in the app generator to skip gems such as
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`turbolinks` and `coffee-rails` that does not have their own specific flags.
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([Commit](https://github.com/rails/rails/commit/10565895805887d4faf004a6f71219da177f78b7))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* Introduced `bin/setup` script to bootstrap an application.
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([Pull Request](https://github.com/rails/rails/pull/15189))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Changed default value for `config.assets.digest` to `true` in development.
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([Pull Request](https://github.com/rails/rails/pull/15155))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Introduced an API to register new extensions for `rake notes`.
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([Pull Request](https://github.com/rails/rails/pull/14379))
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* Introduced `Rails.gem_version` as a convenience method to return `Gem::Version.new(Rails.version)`.
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([Pull Request](https://github.com/rails/rails/pull/14101))
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2014-05-24 17:03:53 -04:00
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2014-08-05 12:38:20 -04:00
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* Introduced an `after_bundle` callback in the Rails templates.
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([Pull Request](https://github.com/rails/rails/pull/16359))
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2014-05-24 17:03:53 -04:00
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Action Pack
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-----------
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2014-07-06 00:15:33 -04:00
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Please refer to the [Changelog][action-pack] for detailed changes.
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2014-08-14 03:35:32 -04:00
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### Removals
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* Removed deprecated `AbstractController::Helpers::ClassMethods::MissingHelperError`
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in favor of `AbstractController::Helpers::MissingHelperError`.
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2014-06-06 21:44:30 -04:00
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### Deprecations
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Deprecated support for setting the `:to` option of a router to a symbol or a
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string that does not contain a `#` character:
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2014-07-09 04:21:23 -04:00
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```ruby
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get '/posts', to: MyRackApp => (No change necessary)
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get '/posts', to: 'post#index' => (No change necessary)
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get '/posts', to: 'posts' => get '/posts', controller: :posts
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get '/posts', to: :index => get '/posts', action: :index
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```
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([Commit](https://github.com/rails/rails/commit/cc26b6b7bccf0eea2e2c1a9ebdcc9d30ca7390d9))
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2014-05-24 17:03:53 -04:00
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### Notable changes
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2014-07-13 20:23:32 -04:00
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* `render nothing: true` or rendering a `nil` body no longer add a single
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space padding to the response body.
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([Pull Request](https://github.com/rails/rails/pull/14883))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* Introduced the `always_permitted_parameters` option to configure which
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parameters are permitted globally. The default value of this configuration
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is `['controller', 'action']`.
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([Pull Request](https://github.com/rails/rails/pull/15933))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* The `*_filter` family methods has been removed from the documentation. Their
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usage are discouraged in favor of the `*_action` family methods:
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2014-07-09 04:21:23 -04:00
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```
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after_filter => after_action
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append_after_filter => append_after_action
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append_around_filter => append_around_action
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append_before_filter => append_before_action
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around_filter => around_action
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before_filter => before_action
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prepend_after_filter => prepend_after_action
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prepend_around_filter => prepend_around_action
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prepend_before_filter => prepend_before_action
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skip_after_filter => skip_after_action
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skip_around_filter => skip_around_action
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skip_before_filter => skip_before_action
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skip_filter => skip_action_callback
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```
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If your application is depending on these methods, you should use the
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replacement `*_action` methods instead. These methods will be deprecated in
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the future and eventually removed from Rails.
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(Commit [1](https://github.com/rails/rails/commit/6c5f43bab8206747a8591435b2aa0ff7051ad3de),
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[2](https://github.com/rails/rails/commit/489a8f2a44dc9cea09154ee1ee2557d1f037c7d4))
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2014-07-09 03:12:51 -04:00
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2014-07-13 20:23:32 -04:00
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* Added HTTP method `MKCALENDAR` from RFC-4791
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([Pull Request](https://github.com/rails/rails/pull/15121))
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2014-07-09 03:12:51 -04:00
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2014-07-13 20:23:32 -04:00
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* `*_fragment.action_controller` notifications now include the controller and action name
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in the payload.
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([Pull Request](https://github.com/rails/rails/pull/14137))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Segments that are passed into URL helpers are now automatically escaped.
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([Commit](https://github.com/rails/rails/commit/5460591f0226a9d248b7b4f89186bd5553e7768f))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Improved Routing Error page with fuzzy matching for route search.
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([Pull Request](https://github.com/rails/rails/pull/14619))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Added option to disable logging of CSRF failures.
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([Pull Request](https://github.com/rails/rails/pull/14280))
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2014-05-24 17:03:53 -04:00
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2014-06-25 13:39:19 -04:00
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Action View
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-------------
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2014-07-06 00:15:33 -04:00
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Please refer to the [Changelog][action-view] for detailed changes.
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2014-06-25 13:39:19 -04:00
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### Deprecations
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2014-07-13 20:23:32 -04:00
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* Deprecated `AbstractController::Base.parent_prefixes`.
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Override `AbstractController::Base.local_prefixes` when you want to change
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where to find views.
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([Pull Request](https://github.com/rails/rails/pull/15026))
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2014-06-25 13:39:19 -04:00
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2014-07-13 20:23:32 -04:00
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* Deprecated `ActionView::Digestor#digest(name, format, finder, options = {})`,
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arguments should be passed as a hash instead.
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([Pull Request](https://github.com/rails/rails/pull/14243))
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2014-06-25 13:39:19 -04:00
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### Notable changes
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2014-07-13 20:23:32 -04:00
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* The form helpers no longer generate a `<div>` element with inline CSS around
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the hidden fields.
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([Pull Request](https://github.com/rails/rails/pull/14738))
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2014-07-11 05:15:00 -04:00
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2014-06-25 13:39:19 -04:00
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2014-05-24 17:03:53 -04:00
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Action Mailer
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-------------
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2014-07-06 00:15:33 -04:00
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Please refer to the [Changelog][action-mailer] for detailed changes.
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2014-05-24 17:03:53 -04:00
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### Notable changes
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2014-07-13 20:23:32 -04:00
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* Added the `show_previews` configuration option for enabling mailer previews
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outside of the development environment.
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([Pull Request](https://github.com/rails/rails/pull/15970))
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2014-07-11 05:15:00 -04:00
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2014-05-24 17:03:53 -04:00
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Active Record
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-------------
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Please refer to the
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[Changelog](https://github.com/rails/rails/blob/4-2-stable/activerecord/CHANGELOG.md)
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for detailed changes.
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2014-06-25 12:43:32 -04:00
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### Removals
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2014-07-13 20:23:32 -04:00
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* Removed `cache_attributes` and friends. All attributes are cached.
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([Pull Request](https://github.com/rails/rails/pull/15429))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* Removed deprecated method `ActiveRecord::Base.quoted_locking_column`.
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([Pull Request](https://github.com/rails/rails/pull/15612))
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2014-06-25 12:43:32 -04:00
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2014-07-13 20:23:32 -04:00
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* Removed deprecated `ActiveRecord::Migrator.proper_table_name`. Use the
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`proper_table_name` instance method on `ActiveRecord::Migration` instead.
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([Pull Request](https://github.com/rails/rails/pull/15512))
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2014-06-25 12:43:32 -04:00
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2014-07-13 20:23:32 -04:00
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* Removed unused `:timestamp` type. Transparently alias it to `:datetime`
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in all cases. Fixes inconsistencies when column types are sent outside of
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`ActiveRecord`, such as for XML Serialization.
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([Pull Request](https://github.com/rails/rails/pull/15184))
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2014-06-25 12:43:32 -04:00
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2014-05-24 17:03:53 -04:00
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### Deprecations
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2014-07-13 20:23:32 -04:00
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* Deprecated broken support for automatic detection of counter caches on
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`has_many :through` associations. You should instead manually specify the
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counter cache on the `has_many` and `belongs_to` associations for the
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through records.
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([Pull Request](https://github.com/rails/rails/pull/15754))
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2014-06-25 12:43:32 -04:00
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2014-07-13 20:23:32 -04:00
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* Deprecated `serialized_attributes` without replacement.
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([Pull Request](https://github.com/rails/rails/pull/15704))
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2014-06-25 12:43:32 -04:00
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2014-07-13 20:23:32 -04:00
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* Deprecated returning `nil` from `column_for_attribute` when no column
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exists. It will return a null object in Rails 5.0
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([Pull Request](https://github.com/rails/rails/pull/15878))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* Deprecated using `.joins`, `.preload` and `.eager_load` with associations
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that depends on the instance state (i.e. those defined with a scope that
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takes an argument) without replacement.
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([Commit](https://github.com/rails/rails/commit/ed56e596a0467390011bc9d56d462539776adac1))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Deprecated passing Active Record objects to `.find` or `.exists?`. Call
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`#id` on the objects first.
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(Commit [1](https://github.com/rails/rails/commit/d92ae6ccca3bcfd73546d612efaea011270bd270),
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[2](https://github.com/rails/rails/commit/d35f0033c7dec2b8d8b52058fb8db495d49596f7))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Deprecated half-baked support for PostgreSQL range values with excluding
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beginnings. We currently map PostgreSQL ranges to Ruby ranges. This conversion
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is not fully possible because the Ruby range does not support excluded
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beginnings.
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2014-07-13 20:23:32 -04:00
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The current solution of incrementing the beginning is not correct
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and is now deprecated. For subtypes where we don't know how to increment
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(e.g. `#succ` is not defined) it will raise an `ArgumentError` for ranges
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with excluding beginnings.
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2014-07-09 04:21:23 -04:00
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2014-07-13 20:23:32 -04:00
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([Commit](https://github.com/rails/rails/commit/91949e48cf41af9f3e4ffba3e5eecf9b0a08bfc3))
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2014-06-15 11:19:54 -04:00
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2014-05-24 17:03:53 -04:00
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### Notable changes
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2014-07-13 20:23:32 -04:00
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* Added a `:required` option to singular associations, which defines a
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presence validation on the association.
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([Pull Request](https://github.com/rails/rails/pull/16056))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* Introduced `ActiveRecord::Base#validate!` that raises `RecordInvalid` if the
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record is invalid.
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([Pull Request](https://github.com/rails/rails/pull/8639))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* `ActiveRecord::Base#reload` now behaves the same as `m = Model.find(m.id)`,
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meaning that it no longer retains the extra attributes from custom
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`select`s.
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([Pull Request](https://github.com/rails/rails/pull/15866))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* Introduced the `bin/rake db:purge` task to empty the database for the
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current environment.
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([Commit](https://github.com/rails/rails/commit/e2f232aba15937a4b9d14bd91e0392c6d55be58d))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* `ActiveRecord::Dirty` now detects in-place changes to mutable values.
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Serialized attributes on ActiveRecord models will no longer save when
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unchanged. This also works with other types such as string columns and json
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columns on PostgreSQL.
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(Pull Requests [1](https://github.com/rails/rails/pull/15674),
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[2](https://github.com/rails/rails/pull/15786),
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[3](https://github.com/rails/rails/pull/15788))
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2014-07-11 05:15:00 -04:00
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2014-07-13 20:23:32 -04:00
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* Added support for `#pretty_print` in `ActiveRecord::Base` objects.
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([Pull Request](https://github.com/rails/rails/pull/15172))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* PostgreSQL and SQLite adapters no longer add a default limit of 255
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characters on string columns.
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([Pull Request](https://github.com/rails/rails/pull/14579))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* `sqlite3:///some/path` now resolves to the absolute system path
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`/some/path`. For relative paths, use `sqlite3:some/path` instead.
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(Previously, `sqlite3:///some/path` resolved to the relative path
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`some/path`. This behaviour was deprecated on Rails 4.1.)
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([Pull Request](https://github.com/rails/rails/pull/14569))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Introduced `#validate` as an alias for `#valid?`.
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([Pull Request](https://github.com/rails/rails/pull/14456))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* `#touch` now accepts multiple attributes to be touched at once.
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([Pull Request](https://github.com/rails/rails/pull/14423))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Added support for fractional seconds for MySQL 5.6 and above.
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(Pull Request [1](https://github.com/rails/rails/pull/8240),
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[2](https://github.com/rails/rails/pull/14359))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Added support for the `citext` column type in PostgreSQL adapter.
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([Pull Request](https://github.com/rails/rails/pull/12523))
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2014-05-24 17:03:53 -04:00
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2014-07-13 20:23:32 -04:00
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* Added support for user-created range types in PostgreSQL adapter.
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|
([Commit](https://github.com/rails/rails/commit/4cb47167e747e8f9dc12b0ddaf82bdb68c03e032))
|
2014-05-24 17:03:53 -04:00
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2014-07-04 20:47:00 -04:00
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2014-05-24 17:03:53 -04:00
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|
Active Model
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|
|
------------
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|
2014-07-06 00:15:33 -04:00
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|
Please refer to the [Changelog][active-model] for detailed changes.
|
2014-05-24 17:03:53 -04:00
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|
|
2014-06-25 13:39:19 -04:00
|
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|
### Removals
|
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|
2014-07-13 20:23:32 -04:00
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|
|
* Removed deprecated `Validator#setup` without replacement.
|
|
|
|
([Pull Request](https://github.com/rails/rails/pull/15617))
|
2014-06-25 13:39:19 -04:00
|
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|
|
2014-05-24 17:03:53 -04:00
|
|
|
### Notable changes
|
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* Introduced `undo_changes` method in `ActiveModel::Dirty` to restore the
|
|
|
|
changed (dirty) attributes to their previous values.
|
|
|
|
([Pull Request](https://github.com/rails/rails/pull/14861))
|
2014-07-11 05:15:00 -04:00
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* `has_secure_password` now verifies that the given password is less than 72
|
|
|
|
characters if validations are enabled.
|
|
|
|
([Pull Request](https://github.com/rails/rails/pull/15708))
|
2014-07-11 05:15:00 -04:00
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* Introduced `#validate` as an alias for `#valid?`.
|
|
|
|
([Pull Request](https://github.com/rails/rails/pull/14456))
|
2014-05-24 17:03:53 -04:00
|
|
|
|
|
|
|
|
|
|
|
Active Support
|
|
|
|
--------------
|
|
|
|
|
2014-07-06 00:15:33 -04:00
|
|
|
Please refer to the [Changelog][active-support] for detailed changes.
|
2014-05-24 17:03:53 -04:00
|
|
|
|
|
|
|
### Removals
|
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* Removed deprecated `Numeric#ago`, `Numeric#until`, `Numeric#since`,
|
|
|
|
`Numeric#from_now`.
|
|
|
|
([Commit](https://github.com/rails/rails/commit/f1eddea1e3f6faf93581c43651348f48b2b7d8bb))
|
2014-05-24 17:03:53 -04:00
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* Removed deprecated string based terminators for `ActiveSupport::Callbacks`.
|
|
|
|
([Pull Request](https://github.com/rails/rails/pull/15100))
|
2014-05-24 17:03:53 -04:00
|
|
|
|
|
|
|
### Deprecations
|
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* Deprecated `Class#superclass_delegating_accessor`, use
|
|
|
|
`Class#class_attribute` instead.
|
|
|
|
([Pull Request](https://github.com/rails/rails/pull/14271))
|
2014-05-24 17:03:53 -04:00
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* Deprecated `ActiveSupport::SafeBuffer#prepend!` as
|
|
|
|
`ActiveSupport::SafeBuffer#prepend` now performs the same function.
|
|
|
|
([Pull Request](https://github.com/rails/rails/pull/14529))
|
2014-05-24 17:03:53 -04:00
|
|
|
|
|
|
|
### Notable changes
|
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* Added `Hash#transform_values` and `Hash#transform_values!` to simplify a
|
|
|
|
common pattern where the values of a hash must change, but the keys are left
|
|
|
|
the same.
|
|
|
|
([Pull Request](https://github.com/rails/rails/pull/15819))
|
2014-07-11 05:15:00 -04:00
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* The `humanize` inflector helper now strips any leading underscores.
|
|
|
|
([Commit](https://github.com/rails/rails/commit/daaa21bc7d20f2e4ff451637423a25ff2d5e75c7))
|
2014-05-24 17:03:53 -04:00
|
|
|
|
2014-07-13 20:23:32 -04:00
|
|
|
* Introduce `Concern#class_methods` as an alternative to
|
|
|
|
`module ClassMethods`, as well as `Kernel#concern` to avoid the
|
|
|
|
`module Foo; extend ActiveSupport::Concern; end` boilerplate.
|
|
|
|
([Commit](https://github.com/rails/rails/commit/b16c36e688970df2f96f793a759365b248b582ad))
|
2014-05-24 17:03:53 -04:00
|
|
|
|
2014-07-04 20:54:33 -04:00
|
|
|
|
2014-05-24 17:03:53 -04:00
|
|
|
Credits
|
|
|
|
-------
|
|
|
|
|
|
|
|
See the
|
|
|
|
[full list of contributors to Rails](http://contributors.rubyonrails.org/) for
|
2014-07-13 20:23:32 -04:00
|
|
|
the many people who spent many hours making Rails the stable and robust
|
|
|
|
framework it is today. Kudos to all of them.
|
2014-07-06 00:15:33 -04:00
|
|
|
|
|
|
|
[railties]: https://github.com/rails/rails/blob/4-2-stable/railties/CHANGELOG.md
|
|
|
|
[action-pack]: https://github.com/rails/rails/blob/4-2-stable/actionpack/CHANGELOG.md
|
|
|
|
[action-view]: https://github.com/rails/rails/blob/4-2-stable/actionview/CHANGELOG.md
|
|
|
|
[action-mailer]: https://github.com/rails/rails/blob/4-2-stable/actionmailer/CHANGELOG.md
|
|
|
|
[active-record]: https://github.com/rails/rails/blob/4-2-stable/activerecord/CHANGELOG.md
|
|
|
|
[active-model]: https://github.com/rails/rails/blob/4-2-stable/activemodel/CHANGELOG.md
|
|
|
|
[active-support]: https://github.com/rails/rails/blob/4-2-stable/activesupport/CHANGELOG.md
|