使用动态键从 Firestore 中删除字段 [英] Delete a field from Firestore, with a dynamic key

问题描述

我正在尝试从 Firestore 中的文档中删除单个字段字段的键保存在一个变量中，例如

I am trying to delete a single field from a Document in Firestore The Key of the field is held in a variable e.g.

var userId = "random-id-1"

在文档中，我有一个成员字段，结构如下:

In the document I have a field of members structured like this:

{
  members:{
    random-id-1:true,
    random-id-2:true
  }
}

我想删除random-id-1:true，但保留random-id-2:true

如果不获取整个成员对象并编写更新的对象，这怎么可能?

How is this possible without getting the entire members object and writing an updated object?

我已经尝试过这个，但是我收到错误:Document引用必须有偶数个段

I have tried this, however I get the error: Document references must have an even number of segments

我也试过这个:

db.collection('groups').doc(this.props.groupId).set({
  members: {
    [userId]: firebase.firestore.FieldValue.delete()
  }
},{merge: true})

但是我收到错误:Function DocumentReference.update() 调用了无效数据.FieldValue.delete() 只能出现在你更新数据的顶层

感谢您的帮助

推荐答案

我已经成功删除了这样的字段:

I have managed to delete a field like this:

let userId = "this-is-my-user-id"
let groupId = "this-is-my-group-id"

db.collection('groups').doc(groupId).update({
  ['members.' + userId]: firebase.firestore.FieldValue.delete()
})

这是使用此处

如果有任何替代方法，请告诉我

Please let me know if there are any alternative methods to this

谢谢

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