一次更新猫鼬中的多个文档

问题描述

我有一个用户文档数组，每个用户都有一个数字的 follower 属性，我只想将此属性加 1，然后立即更新数据库中的所有用户文档.

I have an array of User documents each user has followers attribute which is a number, I just want to increment this attribute by 1 and then update all those user documents in the DB at once.

在请求中，我有一组用户 ID，我使用这些 ID 进行查询以获取一组用户文档.

In the request I have an array of user ids, I query with those ids to get an array of user documents.

const users = await User.find({"_id": {$in: req.body.ids}});

每个用户文档都有一个称为 follower 的属性，它是一个数字.

each user document has an attribute called followers which is a number.

const userSchema = new mongoose.Schema({

  // other attributes...........,

  followers: {
    type: Number,
    default: 0
  }
});

我想增加 users 数组中每个用户的关注者数量并立即更新数据库，而无需发送单独更新每个用户的请求，这可能吗?

I want to increment the number of followers in each user in the users array and update the DB at once without sending a request to update each user separately, Is this even possible?

提前致谢

推荐答案

您可以使用 $inc 并运行 updateMany:

You can use $inc and run updateMany:

await User.updateMany({"_id": {$in: req.body.ids}}, { $inc: { followers: 1 } });

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