Unique cross-model-slug check is likely misconfigured (#19263)
* Page unique_cross_model_slug seems misconfigured
* Update validator test
* More verbose invalid attribute message
* Try dynamic model/attribute registration
* Rubocop
* Use the cross-model-slug existence check
* Register with the dynamic cross-model-slug checker
* Cleanup
* Add missing keys to fr
* Update format regex
* Adjust validation: always presence, unique if changed
* Tests can create reserved-word pages when they need to
* Slugs can be mixed case?
* Case-sensitive is better, actually
* Refactor to use CrossModel check
* Refactor, rename for clarity
* Refactor, avoid mocking oneself
* Refactor, injectable everything
* Add reservedword check to extracted exists? checker
* Move to concerns
* Without dynamic registration
* extend when needed
* Cleanup comments, remove registration references
---------
Co-authored-by: Goran <gorang.pub@gmail.com>
a20cf3e02b