javascript - Firebase Firestore : How to get ref from snapshot via using async/await

Question

我在 Firebase 函数 中使用 Cloud Firestore 和 Node.js 8

简单的开放性问题是:是否可以通过使用 async/await 从 .get() 获取 ref？

示例:

const snapshot = await db.collection(/*..*/).doc(/*..*/).get();
const data = snapshot.data();
const ref = /* ???? */
// Then using...
ref.update({/*..*/});

还是我应该照做？

const ref = db.collection(/*..*/).doc(/*..*/);
const snapshot = await ref.get();
/* so on.../*

Answer 1

如果你想从你的快照常量中获取一个新的引用那么它是可能的我会这样示例

const areaSnapshot = await admin.firestore().doc("areas/greater-boston").get()
const bostonCities = areaSnapshot.data().cities;
const allAreas = await areaSnapshot.ref.parent.doc("new-york").get()
const nyCities= allAreas.data().cities
console.log(bostonCities, nyCities)

更新文档

    //to update document
    const areaSnapshot = await admin.firestore().doc("areas/greater-boston").get()
    const allAreas = areaSnapshot.ref.parent.doc("new-york").update({
                    capital: {
                        liberty: true
                    }
                })
     await allAreas
                .then(() => {
                    console.log("success")
                })
                .catch(err => console.log(err))

来源: https://firebase.google.com/docs/firestore/manage-data/add-data