possibly better fix for ordering pools by category

app/models/pool.rb

@@ -29,6 +29,10 @@ class Pool < ActiveRecord::Base
       where("category = ?", "collection")
     end
 
+    def series_first
+      order("(case category when 'series' then 0 else 1 end), name")
+    end
+
     def search(params)
       q = scoped
       params = {} if params.blank?

app/presenters/post_presenter.rb

@@ -161,16 +161,13 @@ class PostPresenter < Presenter
       return if pool.nil?
       html += pool_link_html(template, pool, :include_rel => true)
 
-      other_pools = @post.pools.active.where("id <> ?", template.params[:pool_id])
-      other_pools = other_pools.series + other_pools.collection
-
+      other_pools = @post.pools.active.where("id <> ?", template.params[:pool_id]).series_first
       other_pools.each do |other_pool|
         html += pool_link_html(template, other_pool)
       end
     else
-      pools = @post.pools.active
-      pools = pools.series + pools.collection
       first = true
+      pools = @post.pools.active.series_first
       pools.each do |pool|
         if first && template.params[:tags].blank?
           html += pool_link_html(template, pool, :include_rel => true)