nested_attributes.rhtml

# What we had to do:
<% semantic_form_for @post do |form| %>
  <%= form.inputs :title, :created_at %>
  <% form.semantic_fields_for @post.author do |author_form| %>
    <% author_form.inputs do %>
      <%= author_form.input :name %>
      <%= author_form.input :posts_count %>
    <% end %>
  <% end %>
<% end %>

# We could also do this:
<% semantic_form_for @post do |form| %>
  <%= form.inputs :title, :created_at %>
  <% form.semantic_fields_for @post.author do |author_form| %>
    <%= author_form.inputs :name, :posts_count %>
  <% end %>
<% end %>

# But now we can do this:
<% semantic_form_for @post do |form| %>
  <%= form.inputs :title, :created_at %>
  <% form.inputs :for => @post.author do |author_form| %>
    <%= author_form.input :name %>
    <%= author_form.input :posts_count %>
  <% end %>
<% end %>

# Or even this:
<% semantic_form_for @post do |form| %>
  <%= form.inputs :title, :created_at %>
  <%= form.inputs :name, :posts_count, :for => @post.author %>
<% end %>