如何在本机反应中从firestore数据库中获取字段值

Question

I'm trying to get data from my firestore database into my react native project. I've been able to get the data of a whole collection but unsure of how I would get different field values individually. Like how would I display the values FlagQuizscore: 83.33333333333334 WalesQuizscore:80 coins:46 from my firestore database into my react native project?

This code displays the values for the whole collection:

import {useEffect, useState} from "react";

export default function ModesScreen({navigation}) {
    const email = auth.currentUser.email
    const userCollectionRef = collection(db,"Users")
    const [users,setUsers] = useState([])

    useEffect(()=>{
        const getUsers = async () => {
            const data = await getDocs(userCollectionRef)
            setUsers(data.docs.map((doc)=>({...doc.data(), id: doc.id})))
        }
        getUsers()
    },[])

    return (
        <View style={styles.container}>
            {users.map((users)=>{return<View key={doc.id}>
                <Text>{users.WalesQuizscore}</Text>
                <Text>{users.coins}</Text>
            </View>})}
        </View>
    );
}

Results from my database I want to get into my react native project:

Answer 1

If you are just trying to get a single document then you can use getDoc() function. Also no need to declares users as an array. Try refactoring the code as shown below:

import {useEffect, useState} from "react";

export default function ModesScreen({navigation}) {
  const email = auth.currentUser.email
  const userDocRef = doc(db,"Users", email)
  const [user, setUser] = useState({})

  useEffect(() => {
    const getUser = async () => {
      const snap = await getDoc(userDocRef)
      setUser({email, ...snap.data()})
    }
    getUser()
  },[])

  return (
    <View style={styles.container}>
      {return <View key={user.email || 'email'}>
          <Text>{user.WalesQuizscore}</Text>
          <Text>{user.coins}</Text>
        </View>})}
    </View>
  );
}