Ruby on Rails

Hi all, I have a billing application in which I want to create a
matrix-type view of period billings by accounting number and by
period. It's almost working, but not quite, and I'm not Rails-savvy
enough to take it further. Can anyone point me in the right
direction? Thanks in advance! -Katie

The app is on github so you can see the models, joins, etc:
https://github.com/sdstoic/billing/tree/master/app

CONTROLLER (period_billings):

def period_billings
@sla = Sla.find(params[:sla_id])
@current_period = PeriodCounter.first.period.pe_number
@period_billings = @sla.period_billings.sort_by { |pb|
[pb.period.pe_number, pb.general_ledger.general_ledger_number] }
@billings = Array.new(@period_billings.collect { |pb|
pb.general_ledger.general_ledger_number }).uniq.sort_by { |gl| gl }
@periods = Period.where("fiscal_year = ?", @sla.fiscal_year)
@general_ledgers = GeneralLedger.sla_related
@total_period_billings =
@sla.period_billings.group_by(&:general_ledger_id)
#@sum_current_amt =
@sla.period_billings.sum(current_amt).group_by(&:general_ledger_id)
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => @period_billings }
end
end

VIEW (_period_billings.html.erb):

<% @cumulative_total = 0 %>

<div id="gl_crosstab">
<table>
<tr>
<th>Period</th>
<% @general_ledgers.each do |g| %>
<th><%= g.general_ledger_number %></th>
<% end %>
<th>Total</th>
<th>% Expended</th>
</tr>
<% @period_billings.group_by(&:general_ledger_id).each do |pb| %>
<tr>
<td><%= pb[1].first.period.pe_number %></td>
<% pb[1].each do |p| %>
<td>
<% @sum_current_amt = pb[1].inject(0){|sum,p| sum +
p.current_amt.to_i} %>
<%= number_to_currency(@sum_current_amt) %>
</td>
<% end %>
<td>
<% @cumulative_total = @cumulative_total + pb[1].inject(0){|
sum,billing| sum+billing.current_amt.to_i} %>
<%= number_to_currency( @cumulative_total ) %> </td>
<td><%= number_to_currency((@cumulative_total/
@sla.project_total)*100) %> % </td>
</tr>
<% end %>

</table>
</div>

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