上传后 Firebase 删除文档。json

Question

在 Firebase 中，我想在比较上传文件中的数据时删除集合中的文档。请问函数怎么写？

示例：文件“mail_addresses_06/14/21.json”已上传到 Storage/Import。数据包含：

{
"EmployeesOut" : [
"john.example@mail.com",
"liz.example@mail.com",
"eve.example@mail.com"
]
}

从 Firestore 数据库中的集合“UserWhiteList”中删除与这些邮件地址同名的文档

非常感谢，JR

Answer 1

以下 Cloud Function 代码应该可以解决问题：

exports.deleteUsers = functions.storage.object().onFinalize(async (object) => {

    const fileBucket = object.bucket; // The Storage bucket that contains the file.
    const filePath = object.name; // File path in the bucket.

    const file = admin
        .storage()
        .bucket(fileBucket)
        .file(filePath);

    const fileData = await file.download();
    const contents = JSON.parse(fileData[0].toString());
    const employeesOut = contents.EmployeesOut;

    const db = admin.firestore();
    const batch = db.batch();

    for (const property in employeesOut) {
        const docRef = db.collection("UserWhiteList").doc(employeesOut[property]);
        batch.delete(docRef);
    }

    return batch.commit();

});

查看相应的文档项：

• Trigger a Cloud Function on Cloud Storage changes
• How to download a file in memory with the Google Cloud Storage Node.js Client
• Batched Writes 删除（注意 500 次操作的限制）