Vanilla Rails
Vanilla Rails is a Rails architecture for rich models and thin controllers, without service objects, form objects, policy objects, presenters, decorators, or view components.
architecture :vanilla_rails
It starts from Rails, then requires these directories to stay empty:
app/servicesapp/formsapp/policiesapp/decoratorsapp/presentersapp/components
See the Vanilla Rails guide for the reasoning and for project-specific rules you can add on top.