雲功能 - 創建新文檔時不會觸發 onWrite

Question

我有一個包含文檔列表的“用戶”集合，每個文檔都有一個用戶對象和一個子集合“通知”。 每當用戶收到新通知時，都會在其子集合 Notifications 下創建一個新文檔。

未觸發雲功能中的觸發器。

這是我的 Firestore 結構：

這是我的功能：

let functions = require('firebase-functions');
let admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.sendNotification = functions.firestore.collection('Users/{userID}/Notifications/{notificationId}')//
    .onWrite(async (change,context) => {

        // get receiver ID
        const receiverId = context.params.userID;

        // get notification object
        const notificationObject = change.after.val();
        // get sender ID
        const senderUid = notificationObject.senderId;

        console.log('sending notification to: ' + senderUid);

        if (senderUid === receiverId) {
            // this should never be called
            console.log('sender is the receiver.');
        }

        // receiver's token
        const getTokenPromise = await admin.firestore().collection('Users').doc(receiverId).once('value');
        const token = getTokenPromise.val().deviceToken;
        // sender user object
        const sender = await admin.firestore().collection('Users').doc(senderUid).once('value');

        const payload = {
            data: {
                senderName: sender.val().userName,
                senderPhoto: sender.val().userPhoto,
                object: JSON.stringify(notificationObject)
            }
        };

        try {
          const response = await admin.messaging().sendToDevice(token, payload);
          console.log("Successfully sent notification:", response);
        }
        catch (error) {
          console.log("Error sending notification:", error);
        }
    });

我做錯了什么？

Answer 1

你應該聲明你的函數

exports.sendNotification = functions.firestore.document('Users/{userID}/Notifications/{notificationId}')//
    .onWrite(async (change,context) => {...});

而不是與

exports.sendNotification = functions.firestore.collection('Users/{userID}/Notifications/{notificationId}')//
    .onWrite(async (change,context) => {...});

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事實上，Cloud Functions for Firestore 是在文檔級別觸發的。 此處和此處的文檔中的更多詳細信息。