a more forgiving "type" search filter

app/models/item.rb

@@ -764,7 +764,7 @@ class Item < ActiveRecord::Base
   end
 
   single_search_filter :type, {:limit => true, :scope => :join_swf_assets} do |zone_set_name|
-    zone_set = Zone::ItemZoneSets[zone_set_name]
+    zone_set = Zone.find_set(zone_set_name)
     raise SearchError, "Type \"#{zone_set_name}\" does not exist" unless zone_set
     SwfAsset.arel_table[:zone_id].in(zone_set.map(&:id))
   end

app/models/zone.rb

@@ -17,16 +17,35 @@ class Zone < StaticResource
     @sometimes ? "#{label} sometimes" : label
   end
   
+  def self.find_set(name)
+    ItemZoneSets[plain(name)]
+  end
+  
+  def self.plain(name)
+    name.delete('\- /').downcase
+  end
+  
   n = 0
   @objects = YAML.load_file(Rails.root.join('config', 'zones.yml')).map do |a|
     a['id'] = (n += 1)
     obj = new(a)
     if obj.type_id == 2 || obj.type_id == 3
-      zone_name = obj.label.delete(' -').gsub(/item$/, '').downcase
-      ItemZoneSets[zone_name] ||= []
-      ItemZoneSets[zone_name] << obj
+      plain_name = plain(obj.label)
+      
+      ItemZoneSets[plain_name] ||= []
+      ItemZoneSets[plain_name] << obj
     end
     obj
   end
   n = nil
+  
+  # Add aliases to keys like "lowerforegrounditem" to "lowerforeground"
+  # ...unless there's already such a key, like "backgrounditem" to "background",
+  # in which case we don't, because that'd be silly.
+  ItemZoneSets.keys.each do |name|
+    if name.end_with?('item')
+      stripped_name = name[0..-5]
+      ItemZoneSets[stripped_name] ||= ItemZoneSets[name]
+    end
+  end
 end