gistfile1.haml

- @last_date = ''

- @results.each do |row|

  - if row.election_d != @last_date
    - @last_date = row.election_d
    %h2= row.election_d
    %table

  %tr
    %td{ :style => "background-color: #{row.party_colour}" }
       
    %td= row.party_name
    %td= row.c_surname
    %td= to_ordinal(row.position)
    %td= commify(row.votes)

Thanks for that. I hadn't heard of group_by before but I can see how that's useful.

In the end I simplified it by using nested loops around first the elections and then the candidacies for each election as in this commit.

Here it is in action.