### New features

* [#325](https://github.com/rubocop/rubocop-rails/pull/325): Add new `Rails/DotSeparatedKeys` cop. ([@fatkodima][])
* [#704](https://github.com/rubocop/rubocop-rails/issues/704): Add new `Rails/StripHeredoc` cop. ([@koic][])
* [#691](https://github.com/rubocop/rubocop-rails/pull/691): Add new `Rails/ToFormattedS` cop. ([@koic][])
* [#588](https://github.com/rubocop/rubocop-rails/pull/588): Add new `Rails/RootPublicPath` cop. ([@leoarnold][])
* [#702](https://github.com/rubocop/rubocop-rails/pull/702): Make `keys` method aware of `Rails/DeprecatedActiveModelErrorsMethods` cop. ([@koic][])
* [#688](https://github.com/rubocop/rubocop-rails/pull/688): Support autocorrection for `Rails/DeprecatedActiveModelErrorsMethods`. ([@koic][])

### Bug fixes

* [#696](https://github.com/rubocop/rubocop-rails/pull/696): Fix a false negative for `Rails/TransactionExitStatement` when `return` is used in `rescue`. ([@koic][])
* [#700](https://github.com/rubocop/rubocop-rails/issues/700): Fix a false positive for `Rails/FilePath` when a list of paths separated by colon including Rails.root. ([@tk0miya][])
* [#680](https://github.com/rubocop/rubocop-rails/issues/680): Fix a false positive for `Rails/ReversibleMigrationMethodDefinition` when using an inner class. ([@koic][])
* [#692](https://github.com/rubocop/rubocop-rails/issues/692): Fix an error for `Rails/UnusedIgnoredColumns` when using no tables db/schema.rb. ([@koic][])
* [#707](https://github.com/rubocop/rubocop-rails/issues/707): Fix an error when a variable is passed to has_many or has_one with double splat. ([@nobuyo][])
* [#695](https://github.com/rubocop/rubocop-rails/pull/695): Fixes a false negative where the `in_rescue?` check would bypass situations where the return was inside a transaction but outside of a rescue. ([@dorkrawk][])
* [#703](https://github.com/rubocop/rubocop-rails/pull/703): Fix not autocorrected for `Rails/DuplicateAssociation`. ([@ydah][])
* [#708](https://github.com/rubocop/rubocop-rails/pull/708): Recover Ruby 2.2 code analysis using `TargetRubyVersion: 2.2`. ([@koic][])

### Changes

* [#697](https://github.com/rubocop/rubocop-rails/pull/697): **(Compatibility)** Drop Ruby 2.5 support. ([@koic][])
* [#705](https://github.com/rubocop/rubocop-rails/pull/705): Add mailers to default `filter`/`action` callbacks cops. ([@ojab][])
* [#710](https://github.com/rubocop/rubocop-rails/pull/710): Rails/TransactionExitStatement - Inspect `ActiveRecord::Locking::Pessimistic#with_lock` too, as `#with_lock` opens a transaction. ([@FunnyHector][])

[@fatkodima]: https://github.com/fatkodima
[@koic]: https://github.com/koic
[@leoarnold]: https://github.com/leoarnold
[@tk0miya]: https://github.com/tk0miya
[@nobuyo]: https://github.com/nobuyo
[@dorkrawk]: https://github.com/dorkrawk
[@ydah]: https://github.com/ydah
[@ojab]: https://github.com/ojab
[@FunnyHector]: https://github.com/FunnyHector
