Improve form success redirections to keep previous filters used

[nicolas-brousse]

The idea is to keep the filters or page where the user was before he goes to a create/update form.

Suggestion: Using the referer. Having a hidden field tag helper that will use existing form_redirect_to redirect_to_on_success param.
If params[:redirect_to_on_success] present, then use it value, otherwise use the request.referer