Disabling features of rails application depending on roles/subscriptions?

If so I would try and modift cancan. If the basic case if that a user is either a superuser (sysadmin) or a premium_user or a standard_user you can have roles for those three things.

Take a look at Rolify. This is a good gem that integrates very well with CanCan for resource scoping and authorization. Documentation tutorial on how to use the two of them together: https://github.com/EppO/rolify/wiki/Tutorial.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.