[英]Calling a Firebase Cloud Function 'ForEach' child of a Snapshot
[英]firebase cloud function snapshot undefined
我試圖編寫一個具有firebase雲功能的功能,一旦將新消息添加到我的“ contactMessages”實時數據庫中,它將立即發送電子郵件。 所以我做到了,但是在這里我得到了一個未定義的快照:
const functions = require("firebase-functions");
const nodemailer = require("nodemailer");
const gmailEmail =
encodeURIComponent(functions.config().gmail.email);
const gmailPassword =
encodeURIComponent(functions.config().gmail.password);
const mailTransport = nodemailer.createTransport(
`smtps://${gmailEmail}:${gmailPassword}@smtp.gmail.com`
);
exports.sendContactMessage = functions.database
.ref("/contactMessages/{pushKey}")
.onWrite((change, context) => {
// Only send email for new messages.
if (snapshot.previous.val() || !snapshot.val().name) {
return;
}
const val = snapshot.val();
const mailOptions = {
to: "test@example.com",
subject: `Information Request from ${val.name}`,
html: val.html
};
return mailTransport.sendMail(mailOptions).then(() => {
return console.log("Mail sent to: test@example.com");
});
});
更改此:
exports.sendContactMessage = functions.database
.ref("/contactMessages/{pushKey}")
.onWrite((change, context) => {
// Only send email for new messages.
if (snapshot.previous.val() || !snapshot.val().name) {
return;
}
到這個:
exports.sendContactMessage = functions.database
.ref("/contactMessages/{pushKey}")
.onWrite((change, context) => {
// Only send email for new messages.
if (change.before.val() || !change.after.val().name) {
return;
}
從文檔:
對於
onWrite
和onUpdate
事件,change
參數具有before
和after
字段。 其中每個都是一個DataSnapshot
具有admin.database.DataSnapshot
可用的相同方法。
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