### Bug fixes

* [#213](https://github.com/rubocop/rubocop-rails/pull/213): Fix a false positive for `Rails/UniqueValidationWithoutIndex` when using conditions. ([@sunny][])
* [#215](https://github.com/rubocop/rubocop-rails/issues/215): Fix a false positive for `Rails/UniqueValidationWithoutIndex` when using Expression Indexes. ([@koic][])
* [#214](https://github.com/rubocop/rubocop-rails/issues/214): Fix an error for `Rails/UniqueValidationWithoutIndex`when a table has no column definition. ([@koic][])
* [#221](https://github.com/rubocop/rubocop-rails/issues/221): Make `Rails/UniqueValidationWithoutIndex` aware of `add_index` in db/schema.rb. ([@koic][])

### Changes

* [#223](https://github.com/rubocop/rubocop-rails/pull/223): Mark `Rails/ApplicationController`, `Rails/ApplicationJob`, `Rails/ApplicationMailer`, and `Rails/ApplicationRecord` as unsafe autocorrect. ([@hoshinotsuyoshi][])

[@sunny]: https://github.com/sunny
[@koic]: https://github.com/koic
[@hoshinotsuyoshi]: https://github.com/hoshinotsuyoshi
