each_group

grouping nodes

The group method takes a list as input and groups items using the given attribute. The object available in “each_group” is the first element of the list of grouped items.

<ul do='nodes in project order by parent_id asc' do='group' by='parent_id'>
  <li do='each_group'><h3 do='parent.title'/>
    <ul>
      <li do='each' do='link'/>
    </ul>
  </li>
</ul>

You can use the method to group other elements such as data or comments:

grouping comments

<ul do='comments from nodes in project order by created_at desc limit 20' do='group' by='discussion_id'>
  <!-- comments grouped by node -->
  <li do='each_group'><h3 do='node.title'/>
    <ul>
      <!-- shows a single comment -->
      <li do='each' do='title'/>
    </ul>
  </li>
</ul>

grouping data

<r:data>
<r:group by='node_a'>
  <r:each_group><r:stat find='sum'/>
    <r:each>...</r:each>
  </r:each_group>
</r:group>
</r:data>