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