Settings
form_attr = {:onsubmit=>"return false", :class=>"forme forme_demo/album"}
form_opts = {:config=>:bs5, :one=>{}, :many=>{}, :date=>{}}
subform_opts = {:config=>:bs5}
Template Code
<% form(Album.last, form_attr, form_opts) do |f| %>
<% f.inputs([:name, :release_date, :copies_sold, :debut_album, :out_of_print], :legend=>:Album) do %>
<%= f.subform(:artist, {:inputs=>[:name]}.merge(subform_opts)) %>
<%= f.subform(:tracks, {:inputs=>[:number, :name, :length]}.merge(subform_opts)) %>
<%= f.subform(:tags, {:inputs=>[:name]}.merge(subform_opts)) %>
<% end %>
<%= f.button(:value=>'Update Album') %>
<% end %>