<% for group in public_groups %>
<%= check_box_tag "section[group_ids][]", group.id,
@section.groups.include?(group), :class => "public_group_ids", :id => "public_group_ids_#{group.id}", :tabindex => next_tabindex %>
<% end %>
Which “Public” groups can view pages in this section?
<%= link_to_check_all 'input.public_group_ids' %>,
<%= link_to_uncheck_all 'input.public_group_ids' %>