memoize domains

app/models/artist.rb

@@ -1,4 +1,5 @@
 class Artist < ActiveRecord::Base
+  extend Memoist
   class RevertError < Exception ; end
 
   before_create :initialize_creator
@@ -52,6 +53,10 @@ class Artist < ActiveRecord::Base
       end
     end
 
+    included do
+      memoize :domains
+    end
+
     def url_array
       urls.map(&:url)
     end
@@ -250,6 +255,8 @@ class Artist < ActiveRecord::Base
     end
 
     def reload(options = nil)
+      flush_cache
+
       if instance_variable_defined?(:@notes)
         remove_instance_variable(:@notes)
       end