How to infer the form method for custom objects in Rails

Automatically infer the correct HTTP verb in your Rails forms by defining the persisted? method.Rails is able to automaticaly infer which HTTP verb to use when generating forms for Active Record models in form_with. How can we get the same for our plain old Ruby objects? Problem We want to avoid having to explicitly specify the method when rendering a form for our custom Cat object. Active Record objects don’t have to do this, so why do we?!.