Cloud Functions 和 Firestore 不会在 Firebase 中根深蒂固

Question

// The Cloud Functions for Firebase SDK to create Cloud Functions and 
setup triggers.
const functions = require('firebase-functions');

// The Firebase Admin SDK to access the Firebase Realtime Database. 
const admin = require('firebase-admin');
admin.initializeApp(functions.config().firebase);

exports.giveCard = functions.firestore
.document('Profiles/{profileId}/cards/{cardsId}/_given/{_givenID}')
.onWrite((event) => {

    // Get the field values of what I am working with
    const oldGiven = event.data.previous.data()['given'];
    const newGiven = event.data.data()['given'];

    // Get the cardID to make sure that is there
    const cardID = event.params.cardsId;

    // An array to go through
    const give_profiles = event.data.data()['given_profiles'];

    // error cardDatatwo is returned as undefined
    const cardDatatwo = newGiven.parent;

    // error cardDatathree is returned as undefined
    const cardDatathree = event.data.ref.root

    // // error cardDatafour cannot read propoerty of undefined
    // const cardDatafour = cardDatathree.child('Profiles/{profileId}/cards/{cardsId}')

    // error cardDatafive 'The value of cardfive is DocumentReference...
    const cardDatafive = event.data.ref.firestore.doc('Profiles/{profileId}/cards/{cardsId}');

    // Check that the values have changed
    if (newGiven == oldGiven) return;

    if (newGiven !== undefined) {

        console.log('The old value of given is', oldGiven);
        console.log('The new value of given is', newGiven);
        console.log('The value of the card is', cardID);
        console.log('The value of the cardtwo is', cardDatatwo);
        console.log('The value of the cardthree is', cardDatathree);
        // console.log('The value of the cardfour is', cardDatafour);
        console.log('The value of the cardfive is', cardDatafive);

        for (var profile of give_profiles) {
            console.log(profile);
        };
        return;
    }
    return console.log("No given value");
});

我很难获得使用 Cloud Functions 的 Firestore 的根目录。当然，它的工作方式不同。

在进一步向下触发 onUpdate 之后，我试图在通往根的路径上获取一个值。

.parent 不起作用 functions.database.ref 当然不起作用，因为那是实时数据库 并且不能使用 firebase.firestore() 在节点中也不起作用 并且 event.data.ref.firestore.doc 以未定义的形式返回。

我确信已经经历了所有选择。

希望你能帮忙。

我

Answer 1

根据the documentation，你可以通过firestore访问收藏，像这样：

exports.giveCard = functions.firestore
.document('Profiles/{profileId}/cards/{cardsId}/_given/{_givenID}')
.onWrite((event) => {

    // other code

    const ref = event.data.ref.firestore.doc('your/path/here');
    return ref.set({foo: 'bar'}).then(res => {
      console.log('Document written');
    });

});

您可以使用firestore 为您要访问的数据库的任何部分构建路径。你也可以使用event.data.ref.parent，像这样：

exports.giveCard = functions.firestore
.document('Profiles/{profileId}/cards/{cardsId}/_given/{_givenID}')
.onWrite((event) => {

    // other code

    const parentref = event.data.ref.parent;
    const grandparentref = parentref.parent; // gets to cardsId
    return grandparentref.set({foo: 'bar'}).then(res => {
      console.log('Document written');
    });

});