activescaffold/active_scaffold

<%
  columns_length = 0
  columns_groups = []
%>
<tr>
<% columns.each_column(for: record) do |column| -%>
  <%
    if column.respond_to? :each_column
      columns_groups << column
      next
    end
    columns_length += 1
  %>
  <%= content_tag :td, content_tag(:span, show_column_value(record, column)), :class => "#{column.name}-column #{:numeric if column.number?}" %>
<% end -%>
</tr>
<% columns_groups.each do |columns_group| %>
<tr>
  <td colspan="<%= columns_length %>">
<% columns_group.each_column do |column| %>
    <%= show_column_value(record, column) %>
<% end %>
  </td>
</tr>
<% end -%>