在Cloud Firestore中,我尝试创建一个Function触发器,但是我遇到了一些问题。
我希望Cloud Firestore功能响应此Firebase Realtime数据库位置的写入:
"VISITORS_PRESENCE" : {
"8PICNP6JBTJDFGiBZYsT" : { // House for sale
"3b1874ec-02f8-4004-817d-a3c44877473c" : { // The user Id
"applicationId" : "3b1874ec-02f8-4004-817d-a3c44877473c",
"last_changed" : 1510859721293,
"state" : "online",
"userId" : "testtest@test,com"
}
}
},
并简单地将此值/写入复制到Cloud Firestore使用此功能: (请注意,这是基于Cloud Firestore docs functions get-started
exports.onvisitorPresence = functions.database
.ref("/VISITORS_PRESENCE/{uid1}/{uid2}").onWrite((event) => {
// Get the data written to Realtime Database
const eventStatus = event.data.val();
// Then use other event data to create a reference to the
// corresponding Firestore document.
const userStatusFirestoreRef = firestore
.doc(`VISITORS_PRESENCE/${event.params.uid1}/USERS/{event.params.uid2}`);
// It is likely that the Realtime Database change that triggered
// this event has already been overwritten by a fast change in
// online / offline status, so we'll re-read the current data
// and compare the timestamps.
return event.data.ref.once("value").then((statusSnapshot) => {
return statusSnapshot.val();
}).then((status) => {
console.log(status, eventStatus);
// If the current timestamp for this data is newer than
// the data that triggered this event, we exit this function.
if (status.last_changed > eventStatus.last_changed) return;
// Otherwise, we convert the last_changed field to a Date
eventStatus.last_changed = new Date(eventStatus.last_changed);
// ... and write it to Firestore.
return userStatusFirestoreRef.set(eventStatus);
});
});
在Cloud Firestore中,它产生的是:
VISITORS_PRESENCE / 8PICNP6JBTJDFGiBZYsT /用户/ {event.params.uid2} /
applicationId“3b1874ec-02f8-4004-817d-a3c44877473c”
last_changed 2017年11月16日下午8:15:21 UTC + 1
国家“在线”
userId“testtest @ test,com”
我希望上面的event.params.uid2
是“3b1874ec-02f8-4004-817d-a3c44877473c”,这是userId。
我该怎么做?
答案 0 :(得分:1)
您的功能由对Firebase实时数据库的写入操作触发:
exports.onvisitorPresence = functions.database
.ref("/VISITORS_PRESENCE/{uid1}/{uid2}").onWrite((event) => {
要通过写入Cloud Firestore来触发功能,请使用:
exports.myFunctionName = functions.firestore
.document('users/marie').onWrite((event) => {
有关更长的示例,请查看documentation for triggering Cloud Functions from Firebase。
答案 1 :(得分:0)
我做了一个错误的错误。我忘记了$ sign
.DOC(
VISITORS_PRESENCE/${event.params.uid1}/USERS/{event.params.uid2}
);.DOC(
VISITORS_PRESENCE/${event.params.uid1}/USERS/${event.params.uid2}
);
现在Cloud Firestore数据看起来还不错:
VISITORS_PRESENCE / 8PICNP6JBTJDFGiBZYsT /用户/ 8PICNP6JBTJDFGiBZYsT /
applicationId" 3b1874ec-02f8-4004-817d-a3c44877473c"
last_changed 2017年11月16日下午8:15:21 UTC + 1
国家"在线"
userId" testtest @ test,com"