Top "Fields-for" questions

In Ruby on Rails this creates a scope around a specific model object like #form_for, but doesn’t create the form tags themselves.

How do I change the html tag and class generated by fields_for?

This is a simple question that I'm kinda ashamed to ask, but I've been banging my head against the wall …

ruby-on-rails ruby-on-rails-3 simple-form fields-for