我正在尝试更新mongodb文档中放置的数组中的元素。通常，在更新操作之后，我会得到整个文档，但我希望返回最新更新的元素：

{
  _id: new ObjectId("6471fe4a0045e48a0c6193ba"),
  gateways: [
    {
      _id: '5231db1f-b79a-4dc3-a387-6f08ad7b6857',
      name: 'Babylon Dev',
      right: 'owner'
    }
  ],
  __v: 0,
  notifications: [
    {
      type: 'confirm',
      title: 'Gateway whitelist request!',
      description: '6471fe4a0045e48a0c6193ba wants to share data from gateway 5231db1f-b79a-4dc3-a387-6f08ad7b6857 with you.',
      actions: [Array],
      from: '6471fe4a0045e48a0c6193ba',
      subject: '5231db1f-b79a-4dc3-a387-6f08ad7b6857',
      status: 'unread',
      _id: new ObjectId("64b6791adbf7bb6eaa528cf2")
    },
    {
          type: 'confirm',
          title: 'Gateway whitelist request!',
          description: '6471fe4a0045e48a0c6193ba wants to share data from gateway 5231db1f-b79a-4dc3-a387-6f08ad7b6857 with you.',
          actions: [Array],
          from: '6471fe4a0045e48a0c6193ba',
          subject: '5231db1f-b79a-4dc3-a387-6f08ad7b6857',
          status: 'unread',
          _id: new ObjectId("64b6791adbf7bb6eaa528cf5")
    }
  ]
}

字符串
我想将通知status属性从unread更新为read或confirmed，并返回更新后的通知。有没有一种简单的方法可以在一个查询中完成此操作？查询将根据文档的_id和通知的_id进行更新。用户模式：

@Schema()
export class User {
  @Prop( { type: [ GatewaySchema ], default: [] } )
  @IsArray( { each: true } )
  @Type( () => Gateway )
  @Expose()
  gateways?: Array<Gateway>;

  @Prop( { type: [ NotificationSchema ], default: [] } )
  @IsArray( { each: true } )
  @Type( () => Notification )
  @Expose()
  notifications?: Array<Notification>;
}

型
通知架构：

@Schema()
export class Notification {

  @IsMongoId()
  @Expose()
  @Prop( { type: Types.ObjectId } )
  _id: Types.ObjectId;

  @IsString()
  @Expose()
  @Prop( { type: String, enum: NotificationLevels, default: NotificationLevels.info } )
  type?: NotificationLevels;

  @IsString()
  @Expose()
  @Prop( { type: String, required: true } )
  title: string;

  @IsString()
  @Expose()
  @Prop( { type: String, required: true } )
  description: string;

  @IsString()
  @Expose()
  @Prop( { type: Array, enum: NotificationAction, default: [ NotificationAction.mark ], required: false } )
  actions?: Array<NotificationAction>;

  @IsMongoId()
  @Prop( { type: Types.ObjectId, required: true } )
  for: Types.ObjectId;;

  @IsMongoId()
  @Prop( { type: Types.ObjectId, required: true } )
  from: Types.ObjectId;

  @IsUUID()
  @Prop( { type: String, required: true } )
  subject: string;

  @IsString()
  @Expose()
  @Prop( { type: String, enum: NotificationStatus, default: NotificationStatus.unread } )
  status: NotificationStatus;
}

型
进度：
为了更新通知，我使用此方法：

db.collection.findOneAndUpdate( { _id: userId, 'notifications._id': notificationId }, { $set: { 'notifications.$.status': 'confirmed' } }, { arrayFilters: [ { _id: notificationId } ], projection: { 'notifications.$': 1 }, new: true } );

型
这很好，但我希望返回的对象是刚刚更新的通知。有点像聚合查询。有什么想法吗