### Bug fixes

* [#345](https://github.com/rubocop/rubocop-rails/issues/345): Fix error of `Rails/AfterCommitOverride` on `after_commit` with a lambda. ([@pocke][])
* [#349](https://github.com/rubocop/rubocop-rails/pull/349): Fix errors of `Rails/UniqueValidationWithoutIndex`. ([@Tietew][])
* [#338](https://github.com/rubocop/rubocop-rails/issues/338): Fix a false positive for `Rails/IndexBy` and `Rails/IndexWith` when the `each_with_object` hash is used in the transformed key or value. ([@eugeneius][])
* [#351](https://github.com/rubocop/rubocop-rails/pull/351): Add `<>` operator to `Rails/WhereNot` cop. ([@Tietew][])
* [#352](https://github.com/rubocop/rubocop-rails/pull/352): Do not register offense if given a splatted hash. ([@dvandersluis][])
* [#346](https://github.com/rubocop/rubocop-rails/pull/346): Fix a false positive for `Rails/DynamicFindBy` when any of the arguments are splat argument. ([@koic][])
* [#357](https://github.com/rubocop/rubocop-rails/issues/357): Fix a false positive for `Rails/ReversibleMigration` when keyword arguments of `change_column_default` are in the order of `to`, `from`. ([@koic][])

[@pocke]: https://github.com/pocke
[@Tietew]: https://github.com/Tietew
[@eugeneius]: https://github.com/eugeneius
[@dvandersluis]: https://github.com/dvandersluis
[@koic]: https://github.com/koic
