Ok, after some thinking and experimentation, I came up with:
<% posts = Post.all(:select => "year, month", :order => "year,
month").collect(&:attributes) %>
<% (posts.first["year"]..posts.last["year"]).to_a.reverse.each do |year|
%>
<p><%= year %></p>
<% posts_by_year = posts.select{|hash| hash["year"] == year} %>
<ul class="nostyle">
<% (1..12).to_a.reverse.each do |index| %>
<% posts_by_month = posts_by_year.select{|hash| hash["month"] ==
("%02d" % index)}%>
<% unless posts_by_month.length == 0 %>
<li><%= link_to "#{Date::MONTHNAMES[index]} #{year}",
month_path(year, ("%02d" % index)) %> (<%= posts_by_month.length
%>)</li>
<% end %>
<% end %>
</ul>
<% end %>
It's working well. It's all still stuck in the view, but oh well. If
anyone knows a better place, let me know.
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