Method of the Day: Array#in_groups_of

This one is great for building rows of tables.

<table>
<% @models.in_groups_of(3).each do |row| %>
  <tr>
    <% row.each do |model| %>
      <td><%= model.to_s %></td>
    <% end %>
  </tr>
<% end %>
</table>

This will render the array in a left-to-right, top-down order. If you want to render in top-down, left-to-right order, try this:

  <% num_cols = 3 %>
  <% @models.in_groups_of((@models.length/num_cols).ceil).transpose.each do |row| %>
  ...
  

That should give you the (more common) column-first layout.