Update syntax for set_inheritance_column

app/models/item.rb

@@ -1,7 +1,8 @@
 class Item < ActiveRecord::Base
   include PrettyParam
   
-  set_inheritance_column 'inheritance_type' # PHP Impress used "type" to describe category
+  # We use the `type` column to mean something other than what Rails means!
+  self.inheritance_column = nil
 
   SwfAssetType = 'object'
   

app/models/swf_asset.rb

@@ -3,6 +3,9 @@ require 'uri'
 require 'utf8'
 
 class SwfAsset < ActiveRecord::Base
+  # We use the `type` column to mean something other than what Rails means!
+  self.inheritance_column = nil
+  
   PUBLIC_ASSET_DIR = File.join('swfs', 'outfit')
   LOCAL_ASSET_DIR = Rails.root.join('public', PUBLIC_ASSET_DIR)
   IMAGE_BUCKET = IMPRESS_S3.bucket('impress-asset-images')
@@ -16,8 +19,6 @@ class SwfAsset < ActiveRecord::Base
   # asset proxy instead.
   NEOPETS_IMAGES_URL_ORIGIN = ENV['NEOPETS_IMAGES_URL_ORIGIN'] || 'http://images.neopets.com'
 
-  set_inheritance_column 'inheritance_type'
-
   IMAGE_SIZES = {
     :small => [150, 150],
     :medium => [300, 300],