I'm new to Rails and having a hard time figuring out how to create a form that submits over Ajax without having a corresponding model object.

My use case is a simple form that collects an email address and sends it an email; there's nothing to be persisted, so no model.

In cases where I do have a model, I've had success with form_for(@model, remote: true). I can't seem to find the right helper for the case where there is no model. I tried form_tag(named_path, remote: true) and that works, but does not use Ajax.

Pointers to an example with an example with a proper controller, .html.erb and routes.rb would be really appreciated.