openproject/app/views/cost_reports/index.rhtml

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

<% @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 %>

<h1>Die sch&ouml;ne Tabelle:</h1>
<table>
<%=debug(@query.walk(:column_first) do |current, subgregation|
 if subgregation.nil?
   ["<td>#{current.inspect}</td>"]
 elsif current.type == :column
   subgregation.first.unshift "<td rowspan='#{subgregation.size}'>#{current.fields.inspect}</td>"
 else
   subgregation.flatten
 end
end) %>
</table>

<div style="border-width: 1; background-color: #BBB; padding: 5px">
  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>