[英]How to get all documents in a collection from Firestore in React Native
我正在尝试从我的 firestore 数据库中的“用户”集合中检索所有文档：
现在我只想检索每个userName和Role 。 我见过很多类似的问题，但他们总是使用这样的快照：
async getMarkers() {
const events = await firebase.firestore().collection('events').get()
.then(querySnapshot => {
querySnapshot.docs.map(doc => {
console.log('LOG 1', doc.data());
return doc.data();
});
});
console.log('LOG 2', events);
return events;
}
但我认为我的项目结构有点不同。
这是位于 firebase 文件夹中的 index.js：
import * as firebase from 'firebase';
import 'firebase/firestore';
const firebaseConfig = {
apiKey: "AIzaSyDVyMU4XZEaLmT17ksu2S6ndnypNwL555s",
authDomain: "cyberpunkprojv1.firebaseapp.com",
databaseURL: "https://cyberpunkprojv1.firebaseio.com",
projectId: "cyberpunkprojv1",
storageBucket: "cyberpunkprojv1.appspot.com",
messagingSenderId: "837539155372",
appId: "1:837539155372:web:e52a4bd30fd0c9da29be09",
measurementId: "G-JGRZT5YX0Q"
};
export const init = () => {
return firebase.initializeApp(firebaseConfig);
}
export const createUser = (user) =>
firebase.firestore().collection('users').doc(user.userName).set(user); // I need to know how to create a subcollection when creating a document
export const getAllUsers = () => firebase.firestore().collection('users').get(); //This line does not work right now.
我在这里主要关心的是getAllUsers 。 请注意，尽管createUser完全按预期工作。
这是在调用getAllUsers的 another.js 屏幕中：
React.useEffect(()=>{
console.log('Select Screen loaded.')
userFetch();
},[])
const userFetch = async () => {
try{
await firebase.init();
const users = await firebase.getAllUsers();
console.log(users);
} catch (error) {
console.log(error);
}
}
function 运行正常，但是控制台中记录了以下内容：
Select Screen loaded.
t {
"SP": null,
"gP": t {
"Je": Array [],
"Ze": "F",
"collectionGroup": null,
"en": t {
"Ye": "users|f:|ob:__name__asc,",
"collectionGroup": null,
"endAt": null,
"filters": Array [],
"limit": null,
"orderBy": Array [
t {
"dir": t {
"name": "asc",
},
"field": e {
"len": 1,
"offset": 0,
"segments": Array [
"__name__",
],
},
"wn": true,
},
],
"path": e {
"len": 1,
"offset": 0,
"segments": Array [
"users",
],
},
"startAt": null,
},
"endAt": null,
"filters": Array [],
"limit": null,
"path": e {
"len": 1,
"offset": 0,
"segments": Array [
"users",
],
},
"startAt": null,
"tn": Array [
t {
"dir": t {
"name": "asc",
},
"field": e {
"len": 1,
"offset": 0,
"segments": Array [
"__name__",
],
},
"wn": true,
},
],
},
"iP": undefined,
"metadata": t {
"fromCache": false,
"hasPendingWrites": false,
},
"nP": t {
"$E": t {
"tl": [Function anonymous],
},
"BE": FirebaseAppImpl {
"automaticDataCollectionEnabled_": false,
"container": ComponentContainer {
"name": "[DEFAULT]",
"providers": Map {
"app" => Provider {
"component": Component {
"instanceFactory": [Function anonymous],
"instantiationMode": "LAZY",
"multipleInstances": false,
"name": "app",
"serviceProps": Object {},
"type": "PUBLIC",
},
"container": [Circular],
"instances": Map {
"[DEFAULT]" => [Circular],
},
"instancesDeferred": Map {},
"name": "app",
},
"platform-logger" => Provider {
"component": Component {
"instanceFactory": [Function anonymous],
"instantiationMode": "LAZY",
"multipleInstances": false,
"name": "platform-logger",
"serviceProps": Object {},
"type": "PRIVATE",
},
"container": [Circular],
"instances": Map {},
"instancesDeferred": Map {},
"name": "platform-logger",
},
"fire-core-rn-version" => Provider {
"component": Component {
"instanceFactory": [Function anonymous],
"instantiationMode": "LAZY",
"multipleInstances": false,
"name": "fire-core-rn-version",
"serviceProps": Object {},
"type": "VERSION",
},
"container": [Circular],
"instances": Map {},
"instancesDeferred": Map {},
"name": "fire-core-rn-version",
},
"fire-js-version" => Provider {
"component": Component {
"instanceFactory": [Function anonymous],
"instantiationMode": "LAZY",
"multipleInstances": false,
"name": "fire-js-version",
"serviceProps": Object {},
"type": "VERSION",
},
"container": [Circular],
"instances": Map {},
"instancesDeferred": Map {},
"name": "fire-js-version",
},
"auth" => Provider {
"component": Object {
"instanceFactory": [Function instanceFactory],
"instantiationMode": "LAZY",
"multipleInstances": false,
"name": "auth",
"serviceProps": Object {
"ActionCodeInfo": Object {
"Operation": Object {
"EMAIL_SIGNIN": "EMAIL_SIGNIN",
"PASSWORD_RESET": "PASSWORD_RESET",
"RECOVER_EMAIL": "RECOVER_EMAIL",
"VERIFY_EMAIL": "VERIFY_EMAIL",
},
},
"ActionCodeURL": [Function d],
"Auth": [Function Lm],
"AuthCredential": [Function kg],
"EmailAuthProvider": [Function d],
"Error": [Function M],
"FacebookAuthProvider": [Function d],
"GithubAuthProvider": [Function d],
"GoogleAuthProvider": [Function d],
"OAuthProvider": [Function d],
"PhoneAuthProvider": [Function d],
"RecaptchaVerifier": [Function d],
"SAMLAuthProvider": [Function d],
"TwitterAuthProvider": [Function d],
},
"type": "PUBLIC",
},
"container": [Circular],
"instances": Map {
"[DEFAULT]" => Object {
"apiKey": "AIzaSyDVyMU4XZEaLmT17ksu2S6ndnypNwL555s",
"appName": "[DEFAULT]",
"authDomain": "cyberpunkprojv1.firebaseapp.com",
"currentUser": null,
},
},
"instancesDeferred": Map {},
"name": "auth",
},
"auth-internal" => Provider {
"component": Object {
"instanceFactory": [Function instanceFactory],
"instantiationMode": "LAZY",
"multipleInstances": false,
"name": "auth-internal",
"type": "PRIVATE",
},
"container": [Circular],
"instances": Map {
"[DEFAULT]" => Object {
"addAuthTokenListener": [Function bound ],
"getToken": [Function bound ],
"getUid": [Function bound ],
"removeAuthTokenListener": [Function bound ],
},
},
"instancesDeferred": Map {},
"name": "auth-internal",
},
"fire-auth-version" => Provider {
"component": Component {
"instanceFactory": [Function anonymous],
"instantiationMode": "LAZY",
"multipleInstances": false,
"name": "fire-auth-version",
"serviceProps": Object {},
"type": "VERSION",
},
"container": [Circular],
"instances": Map {},
"instancesDeferred": Map {},
"name": "fire-auth-version",
},
"database" => Provider {
"component": Component {
"instanceFactory": [Function anonymous],
"instantiationMode": "LAZY",
"multipleInstances": true,
"name": "database",
"serviceProps": Object {
"DataSnapshot": [Function DataSnapshot],
"Database": [Function Database],
"INTERNAL": Object {
"dataUpdateCount": [Function dataUpdateCount],
"forceLongPolling": [Function forceLongPolling],
"forceWebSockets": [Function forceWebSockets],
"interceptServerData": [Function interceptServerData],
"isWebSocketsAvailable": [Function isWebSocketsAvailable],
"setSecurityDebugCallback": [Function setSecurityDebugCallback],
"stats": [Function stats],
"statsIncrementCounter": [Function statsIncrementCounter],
},
"Query": [Function Query],
"Reference": [Function Reference],
"ServerValue": Object {
"TIMESTAMP": Object {
".sv": "timestamp",
},
},
"TEST_ACCESS": Object {
"ConnectionTarget": [Function RepoInfo],
"DataConnection": [Function PersistentConnection],
"RealTimeConnection": [Function Connection],
"forceRestClient": [Function forceRestClient],
"hijackHash": [Function hijackHash],
"queryIdentifier": [Function queryIdentifier],
},
"enableLogging": [Function enableLogging],
},
"type": "PUBLIC",
},
"container": [Circular],
"instances": Map {},
"instancesDeferred": Map {},
"name": "database",
},
"fire-rtdb-version" => Provider {
"component": Component {
"instanceFactory": [Function anonymous],
"instantiationMode": "LAZY",
"multipleInstances": false,
"name": "fire-rtdb-version",
"serviceProps": Object {},
"type": "VERSION",
},
"container": [Circular],
"instances": Map {},
"instancesDeferred": Map {},
"name": "fire-rtdb-version",
},
"storage" => Provider {
"component": Component {
"instanceFactory": [Function factory],
"instantiationMode": "LAZY",
"multipleInstances": true,
"name": "storage",
"container": [Circular],
"instances": Map {},
"instancesDeferred": Map {},
"name": "fire-rtdb-version",
},
"storage" => Provider {
"component": Component {
"instanceFactory": [Function factory],
"instantiationMode": "LAZY",
"multipleInstances": true,
"name": "storage",
"serviceProps": Object {
"Reference": [Function Reference],
"Storage": [Function Service],
"StringFormat": Object {
"BASE64": "base64",
"BASE64URL": "base64url",
"DATA_URL": "data_url",
"RAW": "raw",
},
"TaskEvent": Object {
"STATE_CHANGED": "state_changed",
"TaskState": Object {
"CANCELED": "canceled",
"ERROR": "error",
"PAUSED": "paused",
"RUNNING": "running",
"SUCCESS": "s...(truncated to the first 10000 characters)
我觉得我必须非常接近，但我不知道正在记录的用户 object 实际上是什么。 我真的可以使用这种方法来做到这一点，还是必须像示例中那样使用快照？ 我的方法至少有点作用，因为我使用 Index.js 中的createUser方法创建了所有这些数据库条目，该方法在另一个视图中称为类似方法。
如果我需要添加任何其他信息，请告诉我。
Firestore 返回的QuerySnapshot object 的默认字符串 output 对您没有帮助。 您应该使用提供的 API 编写代码来检查和迭代其结果，如文档中所示：
const users = await firebase.getAllUsers();
// users is a QuerySnapshot
if (users.size() > 0) {
users.forEach(doc => {
console.log(doc.data())
})
}
else {
// decide what you want to do if no results
}
如何在本机反应中从 firebase 火库中获取除一份以外的所有文件？
[英]How to get all documents but one from firebase firestore in react native?
如何获取 Firestore 集合中所有文档的子集合的特定文档？
[英]How to get specific Documents of a Subcollection of all Documents in a Collection in Firestore?
从集合 firebase firestore 中的所有文档中获取数据
[英]get data from all documents in an collection firebase firestore
如何从集合中检索所有文档及其相关信息？ （反应原生 Firebase）
[英]How do i retrieve all documents from a collection and its relevant information? (React Native Firebase)
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