Firebase Firestore-在一个事务中执行多个添加和更新操作
我有一个Firestore文档，表示一天，其中包含Firestore数据库中当天的预订的子集合 以下是我的数据结构的JSON示例：Firebase Firestore-在一个事务中执行多个添加和更新操作,firebase,transactions,google-cloud-firestore,google-cloud-functions,Firebase,Transactions,Google Cloud Firestore,Google Cloud Functions,我有一个Firestore文档，表示一天，其中包含Firestore数据库中当天的预订的子集合 以下是我的数据结构的JSON示例： { "Day":{ "ReservationsCount":2, "Reservations":[ { "Order":1 }, { "Order":2 } ] } } 我需要添
{
"Day":{
"ReservationsCount":2,
"Reservations":[
{
"Order":1
},
{
"Order":2
}
]
}
}
是否有任何方法可以在一个事务中更新现有文档并将文档添加到其子集合？以下操作可以完成。您必须将“day”文档的ref、子集合的ref和一个数组传递给
updateRes（）<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://www.gstatic.com/firebasejs/5.0.4/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/5.0.4/firebase-firestore.js"></script>
</head>
<body>
<script>
var config = {
apiKey: "...",
authDomain: "...",
databaseURL: "...",
....
};
firebase.initializeApp(config);
var firestoredb = firebase.firestore();
function updateRes(dayDocRef, orderCollectionRef, refAndDataArray) {
return firestoredb.runTransaction(function (transaction) {
return transaction.get(dayDocRef)
.then(function (dayDoc) {
if (!dayDoc.exists) {
throw "Document Day does not exist!";
}
newResCount = dayDoc.data().ReservationsCount + refAndDataArray.length;
return transaction.update(dayDocRef, { ReservationsCount: newResCount });
})
.then(function () {
var t = transaction;
refAndDataArray.forEach(function (element) {
t = t.set(orderCollectionRef.doc(element.ref), element.data);
});
return t;
});
}).then(function () {
console.log("Transaction successfully committed!");
}).catch(function (error) {
console.log("Transaction failed: ", error);
});
};
var dayDocRef = firestoredb.collection("Days").doc("Day");
var orderCollectionRef = dayDocRef.collection("Reservations"); //The sub-collection is called "Reservations"
var refAndDataArray = [{ ref: "3", data: { Order: 3, otherData: "foo" } }, { ref: "4", data: { Order: 4, otherData: "bar" } }];
updateRes(dayDocRef, orderCollectionRef, refAndDataArray);
</script>
</body>
</html>
变量配置={
apiKey:“…”，
authDomain:“…”，
数据库URL:“…”，
....
};
firebase.initializeApp（配置）；
var firestoredb=firebase.firestore（）；
函数更新（dayDocRef、orderCollectionRef、refAndDataArray）{
返回firestoredb.runTransaction（函数（事务）{
返回事务.get（dayDocRef）
.then（函数（dayDoc）{
如果（！dayDoc.存在）{
抛出“文档日不存在！”；
}
newResCount=dayDoc.data（）.ReservationsCount+refAndDataArray.length；
return transaction.update（dayDocRef，{reservationscont:newResCount}）；
})
.然后（函数（）{
var t=交易；
refAndDataArray.forEach（函数（元素）{
t=t.set（orderCollectionRef.doc（element.ref）、element.data）；
});
返回t；
});
}).然后（函数（）{
log（“事务已成功提交！”）；
}).catch（函数（错误）{
日志（“事务失败：”，错误）；
});
};
var dayDocRef=firestoredb.collection（“天”）.doc（“天”）；
var orderCollectionRef=dayDocRef.collection（“保留”）；//子集合称为“保留”
var refAndDataArray=[{ref:“3”，数据：{Order:3，otherData:“foo”}，{ref:“4”，数据：{Order:4，otherData:“bar”}]；
更新（dayDocRef、orderCollectionRef、refAndDataArray）；
updateRes（）<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://www.gstatic.com/firebasejs/5.0.4/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/5.0.4/firebase-firestore.js"></script>
</head>
<body>
<script>
var config = {
apiKey: "...",
authDomain: "...",
databaseURL: "...",
....
};
firebase.initializeApp(config);
var firestoredb = firebase.firestore();
function updateRes(dayDocRef, orderCollectionRef, refAndDataArray) {
return firestoredb.runTransaction(function (transaction) {
return transaction.get(dayDocRef)
.then(function (dayDoc) {
if (!dayDoc.exists) {
throw "Document Day does not exist!";
}
newResCount = dayDoc.data().ReservationsCount + refAndDataArray.length;
return transaction.update(dayDocRef, { ReservationsCount: newResCount });
})
.then(function () {
var t = transaction;
refAndDataArray.forEach(function (element) {
t = t.set(orderCollectionRef.doc(element.ref), element.data);
});
return t;
});
}).then(function () {
console.log("Transaction successfully committed!");
}).catch(function (error) {
console.log("Transaction failed: ", error);
});
};
var dayDocRef = firestoredb.collection("Days").doc("Day");
var orderCollectionRef = dayDocRef.collection("Reservations"); //The sub-collection is called "Reservations"
var refAndDataArray = [{ ref: "3", data: { Order: 3, otherData: "foo" } }, { ref: "4", data: { Order: 4, otherData: "bar" } }];
updateRes(dayDocRef, orderCollectionRef, refAndDataArray);
</script>
</body>
</html>
变量配置={
apiKey:“…”，
authDomain:“…”，
数据库URL:“…”，
....
};
firebase.initializeApp（配置）；
var firestoredb=firebase.firestore（）；
函数更新（dayDocRef、orderCollectionRef、refAndDataArray）{
返回firestoredb.runTransaction（函数（事务）{
返回事务.get（dayDocRef）
.then（函数（dayDoc）{
如果（！dayDoc.存在）{
抛出“文档日不存在！”；
}
newResCount=dayDoc.data（）.ReservationsCount+refAndDataArray.length；
return transaction.update（dayDocRef，{reservationscont:newResCount}）；
})
.然后（函数（）{
var t=交易；
refAndDataArray.forEach（函数（元素）{
t=t.set（orderCollectionRef.doc（element.ref）、element.data）；
});
返回t；
});
}).然后（函数（）{
log（“事务已成功提交！”）；
}).catch（函数（错误）{
日志（“事务失败：”，错误）；
});
};
var dayDocRef=firestoredb.collection（“天”）.doc（“天”）；
var orderCollectionRef=dayDocRef.collection（“保留”）//子集合称为“预订”
var refAndDataArray=[{ref:“3”，数据：{Order:3，otherData:“foo”}，{ref:“4”，数据：{Order:4，otherData:“bar”}]；
更新（dayDocRef、orderCollectionRef、refAndDataArray）；
update（）set（）update（）