Firebase数据库在HTTPS Firebase函数上未定义。

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英文:

Firebase db is not defined on HTTPS Firebase Function

问题

我正在创建一个Firebase HTTPS函数，用于从Firestore读取数据并返回给用户。

然而，我遇到了'db is not defined'的问题。我尝试了不同的编写方式，比如const db = firebase.firestore();，但这会导致错误TypeError: firestore.firestore is not a function。

以下是我编写的代码：

  1. const functions = require("firebase-functions");
  2. const admin = require('firebase-admin');
  3. const { firestore } = require("firebase-admin");
  5. admin.initializeApp();
  7. const db = firestore.firestore();
  9. exports.getUsers = functions.https.onRequest((request, response) => {
  10.   let user = request.query.user;
  11.   let ids = getIdsOfUsersWhoHaveSeenUser(user);
  12.   let jsonBody = {
  13.     "users": ids
  14.   }
  15.   let responseBody = JSON.stringify(jsonBody);
  16.   response.send(responseBody);
  17. });
  19. function getIdsOfUsersWhoHaveSeenUser(user) {
  20.   const query = db.collection('users').where('seenUsers', 'array-contains', user);
  21.   query.get()
  22.     .then(snapshot => {
  23.       const documents = snapshot.docs;
  24.       const ids = documents.map(doc => doc.id);
  25.       return ids;
  26.     })
  27.     .catch (error => {
  28.       console.log(error);
  29.     });
  30. };

我还尝试过admin.firestore().collection()，但那也不起作用。

英文:

I am creating a Firebase HTTPS function that reads data from Firestore and returns to the user.

However, I get 'db is not defined'. I've tried different ways of writing this such as const db = firebase.firestore(); but this causes an error TypeError: firestore.firestore is not a function

Here is the code I've written

  1. const functions = require("firebase-functions");
  2. const admin = require('firebase-admin');
  3. const { firestore } = require("firebase-admin");
  5. admin.initializeApp();
  7. const db = firestore.firestore();
  10. exports.getUsers = functions.https.onRequest((request, response) => {
  11.   let user = request.query.user;
  12.   let ids = getIdsOfUsersWhoHaveSeenUser(user);
  13.   let jsonBody = {
  14.     "users": ids
  15.   }
  16.   let responseBody = JSON.stringify(jsonBody);
  17.   response.send(responseBody);
  18. });
  20. function getIdsOfUsersWhoHaveSeenUser(user) {
  21.   const query = db.collection('users').whereField('seenUsers', arrayContains(user));
  22.   query.get()
  23.     .then(snapshot => {
  24.       const documents = snapshot.docs;
  25.       const ids = documents.map(doc => doc.id);
  26.       return ids;
  27.     })
  28.     .catch (error => {
  29.       console.log(error);
  30.     });
  31. };

I've also tried admin.firestore().collection() but that doesn't work either.

答案1

得分: 1

  1. const functions = require("firebase-functions");
  2. const admin = require('firebase-admin');
  4. admin.initializeApp();
  6. const db = admin.firestore();
  8. function getIdsOfUsersWhoHaveSeenUser(user) {
  9.   const query = db.collection('users').where("seenUsers", "array-contains", user);  // <== See change here
  11.   return query.get()   // <== See return here
  12.     .then(snapshot => {
  13.       const documents = snapshot.docs;
  14.       const ids = documents.map(doc => doc.id);
  15.       return ids;
  16.     })
  17.     .catch (error => {
  18.       console.log(error);
  19.     });
  20. };
  22. exports.getUsers = functions.https.onRequest((request, response) => {
  23.   let user = request.query.user;
  24.   getIdsOfUsersWhoHaveSeenUser(user)
  25.    .then(ids => {
  26.       let jsonBody = {
  27.          "users": ids
  28.       }
  29.       let responseBody = JSON.stringify(jsonBody);
  30.       response.send(responseBody);
  32.     });
  33. });

admin 是可以进行 Cloud Firestore 更改的管理员应用实例。

此外，你需要：

  1. 正确返回 getIdsOfUsersWhoHaveSeenUser 函数中的 Promise 链。
  2. 请注意，whereField() 不是 Admin SDK 的方法。你应该使用 where() 方法，详见文档。
英文:

You should do as follows:

  1. const functions = require(&quot;firebase-functions&quot;);
  2. const admin = require(&#39;firebase-admin&#39;);
  4. admin.initializeApp();
  6. const db = admin.firestore();

admin is the admin app instance from which Cloud Firestore changes can be made.

In addition you need to:

  1. Correctly return the Promise chain in your getIdsOfUsersWhoHaveSeenUser function
  2. Note that whereField() is not a method of the Admin SDK. You should use the where() method, see the doc.
  1. function getIdsOfUsersWhoHaveSeenUser(user) {
  2.   const query = db.collection(&#39;users&#39;).where(&quot;seenUsers&quot;, &quot;array-contains&quot;, &quot;user&quot;);  // &lt;== See change here
  4.   return query.get()   // &lt;== See return here
  5.     .then(snapshot =&gt; {
  6.       const documents = snapshot.docs;
  7.       const ids = documents.map(doc =&gt; doc.id);
  8.       return ids;
  9.     })
  10.     .catch (error =&gt; {
  11.       console.log(error);
  12.     });
  13. };

and also take into account the fact that this getIdsOfUsersWhoHaveSeenUser function is asynchronous.

  1. exports.getUsers = functions.https.onRequest((request, response) =&gt; {
  2.   let user = request.query.user;
  3.   getIdsOfUsersWhoHaveSeenUser(user)
  4.  .then(ids =&gt; {
  5.     let jsonBody = {
  6.        &quot;users&quot;: ids
  7.     }
  8.     let responseBody = JSON.stringify(jsonBody);
  9.     response.send(responseBody);
  11.   });
  12. });

huangapple
  • 本文由 发表于 2023年1月9日 14:54:41
  • 转载请务必保留本文链接：https://go.coder-hub.com/75053982.html
  • firebase
  • google-cloud-firestore
  • google-cloud-functions
  • google-cloud-platform
  • node.js
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