错误：Firestore 已初始化您只能调用 settings() 一次，并且只能在调用 Firestore 对象上的任何其他方法之前

如何解决错误：Firestore 已初始化您只能调用 settings() 一次，并且只能在调用 Firestore 对象上的任何其他方法之前

所以我正在为 firebase 规则编写测试，以便我可以为我在 stackoverflow 上编写的另一个问题创建可重现的代码，但我收到此错误：

$ mocha test2.js 


  Our social app
    1) Can read a single public post


  0 passing (245ms)
  1 failing

  1) Our social app
       Can read a single public post:
     Error: Firestore has already been initialized. You can only call settings() once,and only before calling any other methods on a Firestore object.
      at Firestore.settings (node_modules\@google-cloud\firestore\build\src\index.js:434:19)
      at getAdminFirestore (test2.js:41:9)
      at Context.<anonymous> (test2.js:60:23)
      at processImmediate (internal/timers.js:461:21)

我似乎不喜欢在 getAdminFirestore 函数中使用 admin.settings(dbSettings) 但如果我将其注释掉，它就会抛出

Error: Timeout of 2000ms exceeded. For async tests and hooks,ensure "done()" is called; if returning a Promise,ensure it resolves. (C:\Users\julien\Documents\GitHub\reloadium\test\test2.js)
      at listOnTimeout (internal/timers.js:554:17)
      at processTimers (internal/timers.js:497:7)

可能是因为它没有找到模拟器端口？

test2.js

/* eslint-env mocha */
const firebase = require('@firebase/rules-unit-testing');
const firestoreEmulatorPort = 8081;
const dbSettings = { 
  host: `localhost:${firestoreEmulatorPort}`,ssl: false,}
const MY_PROJECT_ID = "test";
const theirId = "user_xyz";

function getFirestore(
  auth,) {
  var db = firebase.initializeTestApp(
    {
      projectId: MY_PROJECT_ID,auth: auth
    }
  )
  .firestore()

  db.settings(
    dbSettings
  )
  

  return (
    db
  )
}

function getAdminFirestore(
) {
  var admin = firebase.initializeAdminApp(
    {
      projectId: MY_PROJECT_ID
    }
  )
  .firestore()

  admin.settings(
    dbSettings
  )

  return (
    admin
  )
}

describe(
  "Our social app",(

  ) => {
    it(
      "Can read a single public post",async (

      ) => {
        const admin = getAdminFirestore();

        const postId = "public_post"
        const setupDoc = admin.collection(
          "posts"
        ).doc(
          postId
        )

        await setupDoc.set(
          {
            authorId: theirId,visibility: "public"
          }
        )

        const db = getFirestore(null)

        const testRead= db.collection(
          "posts"
        ).doc(
          postId
        )

        await firebase.assertSucceeds(
          testRead.get()
        )
      }
    )
  }
)

firestore.rules

rules_version = '2';
service cloud.firestore {
  
  match /databases/{database}/documents {
    match /posts/{postId}{
      allow read:if (
        (
          resource.data.visibility == "public"
        ) || 
        (
          resource.data.authorId == request.auth.uid
        )
      );
    }
  }
}

我该如何解决这个问题？

解决方法

我通过设置 firestore 模拟器端口环境变量解决了我的问题 FIRESTORE_EMULATOR_HOST=localhost:8081 而不是在

中设置端口

const firestoreEmulatorPort = 8081;
const dbSettings = { 
  host: `localhost:${firestoreEmulatorPort}`,ssl: false,}

db.settings(dbSettings)

我从我的代码中删除了这个