def validate(resource)
      value = resource._attributes[attribute]

      if value && !types.any? { |type| value.is_a?(type) }
        short_name = type.to_s.split('::').last
        resource.errors.add(attribute, "must be a kind of #{short_name}")
      end
    end
def validate(resource)
      value = resource._attributes[attribute]

      if value && !types.any? { |type| value.is_a?(type) }
        short_name = type.to_s.split('::').last
        resource.errors.add(attribute, "must be a kind of #{short_name}")
      end
    end
Overload the super method to capture the type attribute in the options
 hash.