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* Add `config/initializers/active_record_belongs_to_required_by_default.rb`
Newly generated Rails apps have a new initializer called
`active_record_belongs_to_required_by_default.rb` which sets the value of
the configuration option `config.active_record.belongs_to_requred_by_default`
to `true` when ActiveRecord is not skipped.
As a result, new Rails apps require `belongs_to` association on model
to be valid.
This initializer is *not* added when running `rake rails:update`, so
old apps ported to Rails 5 will work without any change.
*Josef Šimánek*
* `delete` operations in configurations are run last in order to eliminate
'No such middleware' errors when `insert_before` or `insert_after` are added
after the `delete` operation for the middleware being deleted.
Fixes: #16433.
*Guo Xiang Tan*
* Newly generated applications get a `README.md` in Markdown.
*Xavier Noria*
* Remove the documentation tasks `doc:app`, `doc:rails`, and `doc:guides`.
*Xavier Noria*
* Force generated routes to be inserted into routes.rb
*Andrew White*
* Don't remove all line endings from routes.rb when revoking scaffold.
Fixes #15913.
*Andrew White*
* Rename `--skip-test-unit` option to `--skip-test` in app generator
*Melanie Gilman*
* Add the `method_source` gem to the default Gemfile for apps
*Sean Griffin*
* Drop old test locations from `rake stats`
- test/functional
- test/unit
*Ravil Bayramgalin*
* Update `rake stats` to correctly count declarative tests
as methods in `_test.rb` files.
*Ravil Bayramgalin*
* Remove deprecated `test:all` and `test:all:db` tasks.
*Rafael Mendonça França*
* Remove deprecated `Rails::Rack::LogTailer`.
*Rafael Mendonça França*
* Remove deprecated `RAILS_CACHE` constant.
*Rafael Mendonça França*
* Remove deprecated `serve_static_assets` configuration.
*Rafael Mendonça França*
* Use local variables in `_form.html.erb` partial generated by scaffold.
*Andrew Kozlov*
* Add `config/initializers/callback_terminator.rb`
Newly generated Rails apps have a new initializer called
`callback_terminator.rb` which sets the value of the configuration option
`config.active_support.halt_callback_chains_on_return_false` to `false`.
As a result, new Rails apps do not halt callback chains when a callback
returns `false`; only when they are explicitly halted with `throw(:abort)`.
The terminator is *not* added when running `rake rails:update`, so returning
`false` will still work on old apps ported to Rails 5, displaying a
deprecation warning to prompt users to update their code to the new syntax.
*claudiob*
* Generated fixtures won't use the id when generated with references attributes.
*Pablo Olmos de Aguilera Corradini*
* Add `--skip-action-mailer` option to the app generator.
*claudiob*
* Autoload any second level directories called `app/*/concerns`.
*Alex Robbin*
Please check [4-2-stable](https://github.com/rails/rails/blob/4-2-stable/railties/CHANGELOG.md) for previous changes.
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