Jean-Etienne Durand wrote:
It seems I cannot add a remote form
within a form (helper is not generated at all).
That's correct. Forms cannot contain other forms. The W3C spec spells it out quite clearly.
The solution I've used in a situation similar to yours is to use Ajax for all the inputs (rendering a checkbox_tag with an associated observe_field, for example) with an empty form_remote_tag's submit button for page redirection. It looks and acts like a single form to the user. Potentially puts a heavier burden on you for form-level validation, though, since you're updating the model incrementally.