无法显示来自Firestore的数据

问题描述

此刻我有两个问题

1. 用户登录后显示我的Firestore文档中的数据时遇到问题，他们确实有包含数据的文档

2. 我有一个按钮，允许用户上传文档，我将对其进行解析以提取所有重要数据。然后，将这些数据与ID一起放入文档中，该ID实际上是userId +它属于用户的数字doc。当他们上传数据时，似乎提取的所有数据都使用相同的ID，并且仅显示提取的最后一个ID。

这是我的代码：

const loansRef = firebase.firestore().collection('goals');
const [ courseGoals,setCourseGoals ] = useState([]);
const [goalCounter,setGoalCounter] = useState(0)

//let the user upload doc,what gets called when they press button
const pickDocument = async () => {
        try {
            let input = await DocumentPicker.getDocumentAsync({
                type: "text/plain",});
            setUserOut(await FileSystem.readAsstringAsync(input.uri));
        } catch (error) {
            console.log(error);
        }

        createLoans();
    };
    
    //extracts important info and returns array with all info for one loan
    const fileParser = () => {
        const parsedLoans = [];
        var newUserOut = userOut;

        if (newUserOut.length == 0) {
            return;
        }
        //remove the grants
        var grantPos = newUserOut.search("Grant Type:");
        var pos = newUserOut.search("Loan Type:");
        //hopefully just the loans Now
        newUserOut = newUserOut.slice(pos,grantPos);

        while (newUserOut.length > 0) {
            var lastPos = newUserOut.lastIndexOf("Loan Type:");
            parsedLoans.push(newUserOut.slice(lastPos,newUserOut.length));
            newUserOut = newUserOut.slice(0,lastPos);
        }
        //console.log('parsed loans: ' + parsedLoans)
        return parsedLoans;
    };

    //where we actually create loans and get the important data for each loan
    const createLoans = () => {
        const newLoans = fileParser();
        const title= 'Loan Amount:$'
        const interest = 'Loan Interest Rate:'

        for(let i =0; i < newLoans.length; i++){
            let loan = newLoans[i]
            let goalTitle=loan.substring(loan.indexOf(title)+title.length,loan.indexOf('Loan disbursed Amount:'))
            //console.log("goalTitle: " + goalTitle)
            let interestRate = loan.substring(loan.indexOf(interest)+interest.length,loan.indexOf('Loan Repayment Plan Type'))
            //console.log("Interest rate: "+ interestRate)
            let years = 0
            let paidOff = 0

            addGoalHandler(goalTitle,interestRate,years,paidOff)
        }
        return
    
    };


    useEffect(() => {
        getPW()
        let isMounted = true;

        if (isMounted) {
            loansRef.doc(userId).onSnapshot(
                (docSnapshot) => {
                    if(!docSnapshot.exists){console.log('doc doesnt exist,start from scratch')}
                    else{
                        console.log('loaded successfully '+docSnapshot.data())
                        setGoalCounter(docSnapshot.data().loans.length)
                        console.log(goalCounter)
                    }
                },(error) => {
                    console.log(error);
                }
            );
        }
        return () => {
            isMounted = false;
        };
    },[]);

    
    const addGoalHandler = (goalTitle,paidOff) => {
        //setCourseGoals([...courseGoals,enteredGoal])
        setGoalCounter(goalCounter+1)
        setCourseGoals((prevgoals) => [
            ...courseGoals,{
                id:userId.toString() + goalCounter.toString(),value: goalTitle,interest: interestRate,years: years,paidOff: paidOff
            }
        ]);

        addToFB(goalTitle,paidOff)
        
        //var oldIDS = docIDS 
        //oldIDS.push(userId.toString() + goalCounter.toString())
        //setDocIDS(oldIDS)
        setIsAddMode(false);
    };

    const cancelGoalAdditionHandler = () => {
        setIsAddMode(false);
    };

    const addToFB = async (goalTitle,paidOff) => {
        //adding data to firebase,takes into account if doc exists already 
        const loadDoc = await loansRef.doc(userId).get()
            .then((docSnapshot)=> {
                if(docSnapshot.exists){
                    loansRef.doc(userId).onSnapshot((docu)=>{
                        const updateLoansArr = loansRef.doc(userId).update({
                            loans: firebase.firestore.FieldValue.arrayUnion({
                                id: userId+goalCounter.toString(),paidOff: paidOff
                            })
                        })
                        //setGoalCounter(goalCounter+1)
                    })
                }
                else{
                    const addDoc = loansRef.doc(userId).set({
                        loans: firebase.firestore.FieldValue.arrayUnion({
                        id: userId+goalCounter.toString(),paidOff: paidOff
                    })
                })
                //setGoalCounter(goalCounter+1)
            }})
            //setGoalCounter(goalCounter+1)
        
    }

    const removeGoalHandler = async (goalId) => {
        /*
        setCourseGoals((currentGoals) => {
            loansRef.doc(goalId).delete().then(console.log('removed correctly'))
            return currentGoals.filter((goal) => goal.id !== goalId);
        });
        setGoalCounter(goalCounter-1)
        */
        //need to use the value and not the goalId
        const removeGoal = await loansRef.doc(goalId).update({
            goals: firebase.firestore.FieldValue.arrayRemove(goalId)
        })
        setCourseGoals((currentGoals)=> {
            return currentGoals.filer((goal)=> goal.id !== goalId)
        })
    };

解决方法

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