if defined?(Validate)
    module Validate
       module AutoValidate
         alias :orig_auto_generate_validations, :auto_generate_validations
         def auto_generate_validations(property)
           orig_auto_generate_validations(property)
           return unless property.options[:auto_validation]

           if property.type.ancestors.include?(Types::Enum)
             validates_within property.name, options_with_message({:set => property.type.flag_map.values}, property, :within)
           end
         end
       end
    end
  end