# File lib/fog/network/openstack/requests/update_router.rb, line 11
        def update_router(router_id, options = {})
          data = {'router' => {}}

          [:name, :admin_state_up, :routes].each do |key|
            data['router'][key] = options[key] if options[key]
          end

          # remove this in a future
          egi = options[:external_gateway_info]
          if egi
            if egi.kind_of?(Fog::Network::OpenStack::Network)
              Fog::Logger.deprecation "Passing a model objects into options[:external_gateway_info] is deprecated. \
              Please pass  external external gateway as follows options[:external_gateway_info] = { :network_id => NETWORK_ID }]"
              data['router'][:external_gateway_info] = {:network_id => egi.id}
            elsif egi.kind_of?(Hash)
              data['router'][:external_gateway_info] = egi
            else
              raise ArgumentError, 'Invalid external_gateway_info attribute'
            end
          end

          request(
            :body    => Fog::JSON.encode(data),
            :expects => 200,
            :method  => 'PUT',
            :path    => "routers/#{router_id}.json"
          )
        end