Add Cop for Superclass ActionPolicy to ApplicationPolicy

[hoshy]

Problem

When using the action_policy you should create an ApplicationPolicy class and inherit your resource policies from it (like you do with the ResourceController and ApplicationController in Rails).

It would be great, if Rubocop could check and auto-correct, that policies subclass ApplicationPolicy.

Solution

Implement a cop thats checks, that policies subclass ApplicationPolicy and may auto-correct findings – similar to the Rails/ApplicationController-Cop.

Additional context

I'm currently working on an implementation and will create a PR asap - stay tuned ;-).

[koic]

Hm, RuboCop Rails basically targets Rails core features. So, I'm close this proposal because Active Policy is not a Rails core features. As an alternative, it's probably better to make a custom cop to Action Policy (or 3rd party gem) instead of RuboCop Rails. Thank you.

[hoshy]

You'll find the gem here https://github.com/Nordplaner/rubocop-action_policy