@nickolayabdrafikov yep, good note, but we can't :)

Rubocop warns us better to use nested module/class definitions instead of compact style and that shows us an issue.

We namespaced controller within `User` model class - that is too bad.
I think better use `UserScope` module or something else but it does not related to this PR and more than that we will move examples to the separate branch. So I'm going to fix it there.