    # File lib/fog/aws/models/rds/server.rb, line 103
            def attributes_to_params
              options = {
                'AllocatedStorage'              => allocated_storage,
                'AutoMinorVersionUpgrade'       => auto_minor_version_upgrade,
                'BackupRetentionPeriod'         => backup_retention_period,
                'DBName'                        => db_name,
                'DBParameterGroupName'          => parameter_group_name || attributes['DBParameterGroupName'],
                'DBSecurityGroups'              => security_group_names,
                'DBInstanceIdentifier'          => id,
                'AvailabilityZone'              => availability_zone,
                'DBInstanceClass'               => flavor_id,
                'Port'                          => port || attributes['Port'],
                'Engine'                        => engine,
                'EngineVersion'                 => engine_version,
                'MasterUsername'                => master_username,
                'MasterUserPassword'            => password || attributes['MasterUserPassword'],
                'PreferredMaintenanceWindow'    => preferred_maintenance_window,
                'PreferredBackupWindow'         => preferred_backup_window,
                'MultiAZ'                       => multi_az,
                'LicenseModel'                  => license_model,
                'DBSubnetGroupName'             => db_subnet_group_name
              }

              options.delete_if {|key, value| value.nil?}
            end