# File lib/aws/ec2/vpn_connection_collection.rb, line 86
      def vpn_gateway_id options
        gateway_id = options.delete(:vpn_gateway)
        gateway_id ||= options[:vpn_gateway_id]
        gateway_id ||= filter_value_for('vpn-gateway-id')
        gateway_id = gateway_id.id if gateway_id.is_a?(VPNGateway)
        gateway_id
      end