从云端功能删除Firestore文档中的字段

Question

如何从Cloud Firestore函数中删除文档中的字段？

我正在使用事务，所以我尝试了这种方法：

    const { FieldValue } = require('@google-cloud/firestore');
    ...   
    ..
    transaction.update(docRef, { fieldToRemove: FieldValue.delete() });

但我遇到此错误：

Transaction failure: Error: Update() requires either a single JavaScript object or an alternating list of field/value pairs that can be followed by an optional precondition. Argument "dataOrField" is not a valid Document. Couldn't serialize object of type "DeleteTransform". Firestore doesn't support JavaScript objects with custom prototypes (i.e. objects that were created via the 'new' operator).

谢谢！

Answer 1

您可以按照the docs使用FieldValue.delete()，但需要从“ firebase-admin”导入它：

const admin = require('firebase-admin');
const FieldValue = admin.firestore.FieldValue;
transaction.update(docRef, { fieldToRemove: FieldValue.delete() });