summarizer¶ ↑

Summary¶ ↑

In the model:

class Foo < ActiveRecord::Base
  include Summarizer::Base            # add Summarizer to your class
  summarize :net, :gross              # which columns/methods do you want to sum up?
end

In the controller:

# find_with_sums extends ActiveRecord.find
@foos = Foo.find_with_sums(:all, :order => 'created_at',
  :split_sections_on => Proc.new {|a,b| a.at.month != b.at.month},
  :section_label => Proc.new{|obj| obj.at.strftime("%B %Y")})

In the view:

<table>
<% @foos.each_with_sums do |foo| %>
  <%= render :partial => 'index_section_header', :locals => { :header => foo.section_label } if foo.new_section? %>
  <tr>
    <td><%=h foo.created_at %></td>
    <td><%=h foo.name %></td>
    <td><%=h foo.gross %></td>
    <td><%=h foo.net %></td>
  </tr>
  <%= render :partial => 'index_sum', :locals => { :sum => foo.section_sum } if foo.end_of_section? %>
<% end %>
  <%= render :partial => 'index_sum', :locals => { :sum => @foos.total } %>
</table>

The partials _index_section_header.html.erb

<tr>
  <td colspan="4"><%= header %></td>
</tr>

and _index_sum.html.erb

<tr>
  <td colspan="2">Total</td>
  <td><%= sum.gross %></td>
  <td><%= sum.net %></td>
</tr>

In the Browser:

November 2009
2009-11-29 03:32:27   Blah    160.46     91.25
Total                         160.46     91.25

December 2009
2009-12-04 01:32:45   Blub    130.42    122.24
2009-12-05 18:02:33   Bar      77.53    135.57
2009-12-15 21:19:25   Blah    175.32    150.42
2009-12-31 17:21:49   Baz     192.05    135.04
Total                         575.32    543.27

January 2010
2010-01-08 18:26:48   Blub    116.14    151.22
Total                         116.14    151.22
----------------------------------------------
Total                         851.92    785.74

Usage¶ ↑

Soon to come…

Copyright¶ ↑

Copyright © 2010 Christoph Petschnig. See LICENSE for details.