Groupovanie podla rokov

albums_controller.rb

@albums = Album.all(:conditions => ['published = ?', true], :order => 'created_at desc')
@albums_years = @albums.group_by { |a| a.created_at.beginning_of_year }

# group_by je tu klucovy, vsimni si ze sablona index potom pouziva tu premennu @albums_years

# Tie :conditions je samozrejme zastarala syntax,
# ale aj tak tebe bude stacit Album.all, resp Album.page(...) v pripade strankovania cez kaminari

index.html.erb

<% @page_title = 'Fotogaléria' %>


<% @albums_years.each do |year, albums| %>
  <h3><%= year.strftime("%Y") %></h3>

  <table width="100%" border="0">  
    <% for album in albums %>
    <tr>
      <td style="width: 145px; text-align: right; padding-right: 10px; padding-bottom: 10px;">
        <% for thumb in album.photos.all(:limit => 3) %>
          <%= image_tag(thumb.photo.url(:tiny_square), :style => "border: 1px solid gray; padding: 1px;") %>
        <% end %>
      </td>
      
      <td style='font-size: 16px; padding-bottom: 10px;'>
        <%= link_to album.name, album %>
      </td>
      
      <td style="width: 130px; text-align: right;">
        <%= album.created_at.strftime("%d.%m.%Y") %>
      </td>
    </tr>
    <% end %>
  </table>
  <br />

<% end %>