def full_error(attribute_name, options = {})
      options = options.dup

      options[:error_prefix] ||= if object.class.respond_to?(:human_attribute_name)
        object.class.human_attribute_name(attribute_name.to_s)
      else
        attribute_name.to_s.humanize
      end

      error(attribute_name, options)
    end
def full_error(attribute_name, options = {})
      options = options.dup

      options[:error_prefix] ||= if object.class.respond_to?(:human_attribute_name)
        object.class.human_attribute_name(attribute_name.to_s)
      else
        attribute_name.to_s.humanize
      end

      error(attribute_name, options)
    end
Return the error but also considering its name. This is used
 when errors for a hidden field need to be shown.

 == Examples

    f.full_error :token #=> <span class="error">Token is invalid</span>