openproject/app/views/cost_reports/index.rhtml

<% if @custom_error %>
  <div class="flash error"><%= @custom_error %></div>
<% end %>

<div style="border-width: 1; background-color: #BBB; padding: 5px">
  <% @query = CostQuery.new
     @query.group_by :issue_id
     @query.column :tweek
     @query.row :project_id
     @query.row :user_id
     @walker = @query.walker
     @row = @walker.row_first
     @column = @walker.column_first %>

  query chain: <br />
  <ul>
  <% chain = @query.chain
  while chain %>
    <li><%= chain.class.to_s %></li>
  <% chain = chain.child
    end %>
  </ul>

  <% max = 20 %>
  Result (row):
  <pre><% @row.recursive_each_with_level do |l, r| %>
    <%= "#{'|  '*l}#{r.class} (#{r.fields}) # size:#{r.size}" %><% max -=1; break if max <= 0; end %>
    ...
  </pre>

  <% max = 20 %>
  Result (column):
  <pre><% @column.recursive_each_with_level do |l, r| %>
    <%= "#{'|  '*l}#{r.class} (#{r.fields}) # size:#{r.size}" %><% max -=1; break if max <= 0; end %>
    ...
  </pre>
  
  SQL statement: <br />
  <pre><%= @query.sql_statement.to_s %></pre>
</div>