# 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