firebase - 从云函数删除 Firestore 文档中的字段

Question

如何从云 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() });

但我收到此错误:

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

您按照 the docs 使用 FieldValue.delete() 是正确的，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() });