java - 我正在向 Firestore 数据库输入值，但它们没有进入正确的字段

Question

目前，我正在扫描二维码，然后在 Cloud Firestore 中更新我的出勤集合。它没有将它们放在正确的位置，并且我正在使用 Attendance 类型的模型类。这是我的代码:

 final FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
                        final DocumentReference docRef = rootRef.collection("Session").document(rawValue);
                        docRef.get().addOnCompleteListener(new OnCompleteListener<DocumentSnapshot>() {
                            @Override
                            public void onComplete(@NonNull Task<DocumentSnapshot> task) {
                                if (task.isSuccessful()){
                                    DocumentSnapshot document = task.getResult();
                                    if (document.exists()) {

                                        Date timeToCheck = calendar.getTime();
                                        Session session = document.toObject(Session.class);
                                        Date startTime = session.getStartTime();
                                        Date endTime = session.getEndTime();
                                        if (timeToCheck.after(startTime) && (timeToCheck.before(endTime))) {
                                            Attendance attendance = new Attendance(rawValue, userUID, date, userEmail);
                                            attendanceRef3.add(attendance);
                                            Toast.makeText(StudentAccount.this,
                                                    "Your attendance has been recorded", Toast.LENGTH_SHORT).show();
                                        } else {
                                            Toast.makeText(StudentAccount.this,
                                                    "You are outside the time parameters for this session", Toast.LENGTH_SHORT).show();
                                        }
                                    }
                                    else {
                                        Toast.makeText(StudentAccount.this,
                                                "Session does not exist", Toast.LENGTH_SHORT).show();

这是我的出勤模型类代码:我正在创建一个出勤类型的对象并尝试输入它。目前，它们位于错误的位置，我已经尝试更改它们以匹配它们在考勤构造函数中的外观:

package com.dissertation.studentscanner;

public class Attendance {

private String sessionID;
private String userUID;
private String signInTime;
private String userEmail;

public Attendance(){
    //public no-arg constructor needed
}



public Attendance(String userUID){
    this.userUID = userUID;
}

public Attendance (String sessionID, String userUID){
    this.sessionID = sessionID;
    this.userUID = userUID;
}

public Attendance( String sessionID, String date, String userEmail, String userUID){
    this.sessionID = sessionID;
    this.signInTime = date;
    this.userEmail = userEmail;
    this.userUID = userUID;

}

public String getSessionID(){
    return sessionID;
}

public String getUserUID(){
    return userUID;
}

public String getSignInTime(){
    return signInTime;
}

public String getUserEmail(){
    return userEmail;
}

还是这样

Answer 1

根据您的评论，发生这种情况是因为当您使用 Attendance 类的对象将数据添加到数据库时，您以错误的顺序传递给构造函数值。构造函数声明如下:

public Attendance( String sessionID, String date, String userEmail, String userUID)

因此，当您创建 Attendance 类的新对象时，您应该将以下值传递给构造函数:

Attendance attendance = new Attendance(rawValue, date, userEmail, userUID);

而不是:

Attendance attendance = new Attendance(rawValue, userUID, date, userEmail);

就像现在在您的代码中一样。看到正确的顺序了吗？