Previously, the `has_one` macro incorrectly accepts the `counter_cache` option due to a bug, although that options was never supported nor functional on `has_one` and `has_one ... through` relationships. It now correctly raises an `ArgumentError` when passed that option. For reference, this bug was introduced in 52f8e4b.
[ci skip]. This solves: ``` Could not find gem 'arel (~> 5.0.0) ruby', which is required by gem 'rails (>= 0) ruby', in any of the sources. ```
…k with private or protected methods. [ci skip]
…been deprecated already.
…w exceptions should me made clear. Made that section to be a instead of a regular paragraph.
Extract **notable changes**, **deprecations** and **removals** from each CHANGELOG. I tried to reference the commits and pull requests for new features and deprecations. In the process I also made some minor changes to the CHANGELOGS. The 4_1_release_notes guide is declared WIP.