upgrade to mongo_mapper 0.7.0

app/models/item.rb

@@ -28,7 +28,7 @@ class Item
   end
   
   def self.find_by_name(item_name)
-    Item.find(:first, :conditions => { :name => item_name, :is_published => true })
+    Item.first(:conditions => { :name => item_name, :is_published => true })
   end
   
   def ancestors