reactjs ref.orderBy不是包含firebase和react.js的函数

qlvxas9a  于 2023-03-29  发布在  React
关注(0)|答案(1)|浏览(146)

我正在开发一个聊天消息功能,但在我的控制台中遇到了这个错误:messagesRef.orderBy is not a function
下面是我目前的代码:

消防基地.js

import firebase from 'firebase/compat/app'
import 'firebase/compat/auth'
import "firebase/compat/storage";
import { getStorage } from "firebase/storage";
import { getFirestore } from "firebase/firestore"

const app = firebase.initializeApp({
    apiKey: process.env.REACT_APP_FIREBASE_API_KEY,
    authDomain: process.env.REACT_APP_FIREBASE_AUTH_DOMAIN,
    projectId: process.env.REACT_APP_FIREBASE_PROJECT_ID,
    storageBucket: process.env.REACT_APP_FIREBASE_STORAGE_BUCKET,
    messagingSenderId: process.env.REACT_APP_FIREBASE_MESSAGE_SENDER_ID,
    appId: process.env.REACT_APP_FIREBASE_APP_ID
})

export const auth = app.auth()
export const storage = getStorage(app);
export const db = getFirestore(app);
export default app

Messages.jsx

import React, { useState, useEffect } from "react";
import { auth, db } from "../firebase"
import { collection, getDocs } from "firebase/firestore";

const Messaging = () => {
  const [user, setUser] = useState(null);
  const [text, setText] = useState("");
  const [messages, setMessages] = useState([]);

  useEffect(() => {
    const unsubscribe = auth.onAuthStateChanged((user) => {
      if (user) {
        setUser(user);
      } else {
        setUser(null);
      }
    });

    const messagesRef = collection(db, "messages");
    messagesRef.orderBy("createdAt").onSnapshot((snapshot) => {
      const messagesList = snapshot.docs.map((doc) => ({
        ...doc.data(),
        id: doc.id,
      }));
      setMessages(messagesList);
    });
    return () => {
      unsubscribe();
    };
  }, []);

  const handleTextChange = (e) => {
    setText(e.target.value);
  };

  const handleSend = () => {
    const newMessage = {
      text,
      createdAt: new Date(),
      userId: user.uid,
    };
    db.collection("messages").add(newMessage);
    setText("");
  };

  return (
    <>
      <div>
        {user ? (
          <div>
            <div>
              {messages.map((message) => (
                <div key={message.id}>
                  <p>{message.text}</p>
                </div>
              ))}
            </div>
            <div>
              <input value={text} onChange={handleTextChange} />
              <button onClick={handleSend}>Send</button>
            </div>
          </div>
        ) : (
          <button onClick={() => auth.signInAnonymously()}>Sign In</button>
        )}
      </div>
    </>
  );
};

export default Messaging;

我的假设是集合没有被正确导入,但是我已经尝试了collection(db, "messages")db.collection("messages"),我不确定从哪里开始。
感谢您的任何输入您可能有!
此外,我已经知道我不应该导入/compat库,但我得到一个错误,没有它,所以这是没有改变。

dfty9e19

dfty9e191#

您正在从新的(ish)模块化SDK导入getFirestore,这意味着像orderBy这样的功能是一个顶级函数,而不是引用上的方法。因此,如果我们遵循文档中关于排序数据的代码示例,这意味着您的代码应该是:

import { collection, getDocs, onSnapshot, query, orderBy } from "firebase/firestore";

    ...

    const messagesRef = collection(db, "messages");
    onSnapshot(query(messagesRef, orderBy("createdAt")), (snapshot) => {
      ...
    });

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