fixing metadata hash conversion

app/models/concerns/metadatable.rb

@@ -9,6 +9,7 @@ module Metadatable
 
   def get_metadata_values_of key
     values = []
+    metadata = JSON.parse(metadata) if metadata.class == String
     unless metadata.blank?
       metadata.each do |m|
         m = m.with_indifferent_access

app/models/concerns/stateful.rb

@@ -2,7 +2,7 @@ module Stateful
   extend ActiveSupport::Concern
 
   included do
-    validate_presence_of :state
+    validates_presence_of :state
   end
 
   def is_published?