从 expo 环境调用后 Firestore 返回元数据
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【中文标题】从 expo 环境调用后 Firestore 返回元数据【英文标题】：Firestore returning metadata after call from expo environment 【发布时间】：2021-07-31 01:59:36 【问题描述】：大家好，我是反应原生的新手。我正在使用 expo env 的 firebase 包将 firebase 连接到我的项目。 auth 和添加 db 工作正常，但是当我尝试从 firestore 获取数据时，我得到了很多元数据并且无法解析它。
这是我的调用函数。
const getUserData = async () =>
const uid = await AuthUser.getUser();
try
const data = await firebase.firestore().collection('users').get();
data.docs.forEach(doc =>
console.log(doc.data())
);
catch (error)
console.log("error while getting user details", error)
;
这是我得到的结果
Array [
Zu
"_": vu
"Hf": Ku
"firestore": Qu
"INTERNAL": Object
"delete": [Function _delete],
,
"Id": qu ,
"_": tu
"A_": 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",
"REVERT_SECOND_FACTOR_ADDITION": "REVERT_SECOND_FACTOR_ADDITION",
"VERIFY_AND_CHANGE_EMAIL": "VERIFY_AND_CHANGE_EMAIL",
"VERIFY_EMAIL": "VERIFY_EMAIL",
,
,
"ActionCodeURL": [Function d],
"Auth": [Function En],
"AuthCredential": [Function Bg],
"EmailAuthProvider": [Function d],
"Error": [Function t],
"FacebookAuthProvider": [Function d],
"GithubAuthProvider": [Function d],
"GoogleAuthProvider": [Function d],
"OAuthProvider": [Function d],
"PhoneAuthProvider": [Function d],
"PhoneMultiFactorGenerator": [Function d],
"RecaptchaVerifier": [Function d],
"SAMLAuthProvider": [Function d],
"TwitterAuthProvider": [Function d],
,
"type": "PUBLIC",
,
"container": [Circular],
"instances": Map
"[DEFAULT]" => Object
"apiKey": "xxxx",
"appName": "[DEFAULT]",
"authDomain": "xxxx",
"currentUser": Object
"apiKey": "xxxx",
"appName": "[DEFAULT]",
"authDomain": "xxxx",
"createdAt": "xxxx",
"displayName": null,
"email": "sayanc20002@gmail.com",
"emailVerified": false,
"isAnonymous": false,
"lastLoginAt": "1620559912736",
"multiFactor": Object
"enrolledFactors": Array [],
,
"phoneNumber": null,
"photoURL": null,
"providerData": Array [
Object
"displayName": null,
"email": "sayanc20002@gmail.com",
"phoneNumber": null,
"photoURL": null,
"providerId": "password",
"uid": "sayanc20002@gmail.com",
,
],
"redirectEventId": null,
"stsTokenManager": Object
"accessToken": "xxxx",
"apiKey": "xxxx",
"expirationTime": 1620563512726,
"refreshToken": "xxxx",
,
"tenantId": null,
"uid": "uoGEBWjWHMfXhBL4dVodHAiHr7d2",
,
,
,
"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,
...(truncated to the first 10000 characters)
数据库使用公共字段 uid 链接到 auth。 另外，如果你们能帮助我如何根据 uid 搜索集合中的文档
【问题讨论】：
【参考方案1】：该日志输出看起来像是来自 console.log(doc.data()) 以外的其他地方，因为它包含不应由 data() 返回的内部数据结构。
但无论哪种方式，要从文档中获取字段值，请使用 Firebase javascript SDK 和/或 ReactNative Firebase 的文档。
例如，如果您在用户文档中有 name 字段，则应如下所示：
console.log(doc.data()['name'])
【讨论】：
非常感谢我解决了这个问题。以上是关于从 expo 环境调用后 Firestore 返回元数据的主要内容，如果未能解决你的问题，请参考以下文章
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