ActiveRecord::LegacyYamlAdapter::Rails420

# File activerecord/lib/active_record/legacy_yaml_adapter.rb, line 20
      def self.convert(klass, coder)
        attribute_set = coder["attributes"]

        klass.attribute_names.each do |attr_name|
          attribute = attribute_set[attr_name]
          if attribute.type.is_a?(Delegator)
            type_from_klass = klass.type_for_attribute(attr_name)
            attribute_set[attr_name] = attribute.with_type(type_from_klass)
          end
        end

        coder
      end