在修改后的文档上触发电子邮件 Firebase 扩展

Question

当文档数据被修改时如何触发发送邮件？

Trigger Email 仅根据编写文档的内容撰写电子邮件并将其发送到 Cloud Firestore 集合但未修改

我想不出来这个……

Answer 1

通过检查code，我们可以看到扩展程序已经处理了对文档的所有写入：

export const processQueue = functions.handler.firestore.document.onWrite(
  ...

从further 的角度看，似乎扩展对写入的操作取决于文档中delivery.state 字段的值。

async function processWrite(change) {
  ...
  const payload = change.after.data() as QueuePayload;
  ...

  switch (payload.delivery.state) {
    case "SUCCESS":
    case "ERROR":
      return null;
    case "PROCESSING":
      if (payload.delivery.leaseExpireTime.toMillis() < Date.now()) {
        // Wrapping in transaction to allow for automatic retries (#48)
        return admin.firestore().runTransaction((transaction) => {
          transaction.update(change.after.ref, {
            "delivery.state": "ERROR",
            error: "Message processing lease expired.",
          });
          return Promise.resolve();
        });
      }
      return null;
    case "PENDING":
    case "RETRY":
      // Wrapping in transaction to allow for automatic retries (#48)
      await admin.firestore().runTransaction((transaction) => {
        transaction.update(change.after.ref, {
          "delivery.state": "PROCESSING",
          "delivery.leaseExpireTime": admin.firestore.Timestamp.fromMillis(
            Date.now() + 60000
          ),
        });
        return Promise.resolve();
      });
      return deliver(payload, change.after.ref);
  }
}

我的猜测是，如果您清除该字段，扩展程序将接收该更改并尝试再次邮寄文档。