working cache

app/models/i18n_variable.rb

@@ -3,10 +3,13 @@ class I18nVariable
   include Mongoid::Document
   include Mongoid::Timestamps
  
-  field :key
-  field :document_class, :type => String
+  field :key, :index => true
+  field :document_class, :type => String, :index => true
   field :parent_id, :type => BSON::ObjectId, :index => true
   
+  
+
+
   belongs_to :language_value, polymorphic: true
   
   def method_missing(*field)