How do I add authority sharing between members in Rails without creating authentication? [closed]

Often there are situations when it is necessary to add administrative functions to your application without creating an authentication system. Suppose I created a blog (yes, so trivial). All users have the right to view the list of articles, read articles, create and view comments: guests, administration, and frequent visitors are all. But now only admins have the right to create articles, delete them, delete and edit comments. How to organize this structure? The first thing that comes to mind is http-basic-authetication, but I don't think this is something that should be used in a real application. Then one could create a simple authentication system. But why? People have no reason to register on the blog, if they can read posts. Actually, hence the question: How to competently build such a system? Add only Admin model and add namespce admin to routs? Or how? Interested in how to solve such problems most correctly. Thank.