<% my ($f, $person) = @_ %>
<%= $f->form_for($person, sub($view, $fb, $person) { %>
  <div>
    <%= $fb->label('first_name') %>
    <%= $fb->input('first_name') %>
    <%= $fb->label('last_name') %>
    <%= $fb->input('last_name') %>
  </div>
<% }) %>