# File lib/fog/aws/models/rds/cluster.rb, line 69
        def attributes_to_params
          options = {
            'AllocatedStorage'           => allocated_storage,
            'BackupRetentionPeriod'      => backup_retention_period,
            'DBClusterIdentifier'        => identity,
            'DBClusterParameterGroup'    => db_cluster_parameter_group,
            'DBSubnetGroupName'          => db_subnet_group,
            'Endpoint'                   => endpoint,
            'Engine'                     => engine,
            'EngineVersion'              => engine_version,
            'MasterUserPassword'         => password,
            'MasterUsername'             => master_username,
            'PreferredBackupWindow'      => preferred_backup_window,
            'PreferredMaintenanceWindow' => preferred_maintenance_window,
            'Status'                     => state,
            'StorageEncrypted'           => storage_encrypted,
            'VpcSecurityGroups'          => vpc_security_groups,
          }

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