module Grape
  module ErrorFormatter
    module Xml
      class << self
        def call(message, backtrace, options = {}, env = nil)
          result = message.is_a?(Hash) ? message : { message: message }
          if (options[:rescue_options] || {})[:backtrace] && backtrace && !backtrace.empty?
            result = result.merge(backtrace: backtrace)
          end
          result.respond_to?(:to_xml) ? result.to_xml(root: :error) : result.to_s
        end
      end
    end
  end
end