# File lib/fog/aws/models/compute/network_interface.rb, line 55
        def save
          requires :subnet_id
          options = {
            'PrivateIpAddress'      => private_ip_address,
            'Description'           => description,
            'GroupSet'              => group_set,
          }
          options.delete_if {|key, value| value.nil?}
          data = service.create_network_interface(subnet_id, options).body['networkInterface']
          new_attributes = data.reject {|key,value| key == 'requestId'}
          merge_attributes(new_attributes)
          true
        end