文档参考无效。文档引用必须有偶数个段，但城市/SF/地标有 3 个

Question

你好，我正在关注 firestore 教程

https://firebase.google.com/docs/firestore/query-data/queries#web-version-9_14

首先，他们指示我为数据库播种

import { collection, doc, setDoc } from "firebase/firestore"; 

const citiesRef = collection(db, "cities");

await setDoc(doc(citiesRef, "SF"), {
    name: "San Francisco", state: "CA", country: "USA",
    capital: false, population: 860000,
    regions: ["west_coast", "norcal"] });
await setDoc(doc(citiesRef, "LA"), {
    name: "Los Angeles", state: "CA", country: "USA",
    capital: false, population: 3900000,
    regions: ["west_coast", "socal"] });
await setDoc(doc(citiesRef, "DC"), {
    name: "Washington, D.C.", state: null, country: "USA",
    capital: true, population: 680000,
    regions: ["east_coast"] });
await setDoc(doc(citiesRef, "TOK"), {
    name: "Tokyo", state: null, country: "Japan",
    capital: true, population: 9000000,
    regions: ["kanto", "honshu"] });
await setDoc(doc(citiesRef, "BJ"), {
    name: "Beijing", state: null, country: "China",
    capital: true, population: 21500000,
    regions: ["jingjinji", "hebei"] }); 

在本教程的后面，他们指示我运行此代码来创建一些子集合

import { collection, doc, setDoc } from "firebase/firestore";  

const citiesRef = collection(db, 'cities');

await Promise.all([
    setDoc(doc(citiesRef, 'SF', 'landmarks'), {
        name: 'Golden Gate Bridge',
        type: 'bridge'
    }),
    setDoc(doc(citiesRef, 'SF', 'landmarks'), {
        name: 'Legion of Honor',
        type: 'museum'
    }),
    setDoc(doc(citiesRef, 'LA', 'landmarks'), {
        name: 'Griffith Park',
        type: 'park'
    }),
    setDoc(doc(citiesRef, 'LA', 'landmarks'), {
        name: 'The Getty',
        type: 'museum'
    }),
    setDoc(doc(citiesRef, 'DC', 'landmarks'), {
        name: 'Lincoln Memorial',
        type: 'memorial'
    }),
    setDoc(doc(citiesRef, 'DC', 'landmarks'), {
        name: 'National Air and Space Museum',
        type: 'museum'
    }),
    setDoc(doc(citiesRef, 'TOK', 'landmarks'), {
        name: 'Ueno Park',
        type: 'park'
    }),
    setDoc(doc(citiesRef, 'TOK', 'landmarks'), {
        name: 'National Museum of Nature and Science',
        type: 'museum'
    }),
    setDoc(doc(citiesRef, 'BJ', 'landmarks'), {
        name: 'Jingshan Park',
        type: 'park'
    }),
    setDoc(doc(citiesRef, 'BJ', 'landmarks'), {
        name: 'Beijing Ancient Observatory',
        type: 'museum'
    })
]); 

但是，这会导致错误

errors.ts:94 Uncaught FirebaseError: Invalid document reference. Document references must have an even number of segments, but cities/SF/landmarks has 3.

有人知道这是什么原因吗？

Answer 1

这看起来像是示例代码中的错误。由于citiesRef是集合引用，所以 是doc(citiesRef, 'SF', 'landmarks')，并且您不能调用setDoc集合引用。

调用addDoc代替setDoc和collection代替doc，事情应该会更好：

addDoc(collection(citiesRef, 'SF', 'landmarks'), {
    name: 'Golden Gate Bridge',
    type: 'bridge'
}),

2022 年 6 月 16 日更新：该文档页面已修复，现在使用addDoc()代替setDoc()和collection()代替doc()。