有没有办法将 Key 存储在我从 Firebase 对象投射的类中? [英] Is there a way to store Key in class which I cast from Firebase object?

问题描述

这是我的数据库:

[x] database
-- > [+] students
-----> [+] -KuGacomJymBwkcc7zlU (pushKey)
-----------> Name - Jon
-----------> Age - 21

我有 Student.class :

I have Student.class :

String name;
String age;

public Student(String Name, String Age) {
this.name=Name;
this.age=Age;
}

我从 firebase 数据快照中读取信息，如下所示:

I read the information from firebase datasnapshot like this:

Student newStudent = DataSnapshot.getValue(Student.class);

当我这样做时，我得到了姓名和年龄，但我的问题是是否有办法将 ID (pushKey) 存储在 Student 类上而不添加一个字符串来保存它并在 firebase 数据库上获取另一个字段.

When I do this I get the name and the age, but my question if there is a way to store the ID (pushKey) on the Student class without adding a String that will hold it and take another field on the firebase database.

谢谢大家.

推荐答案

我更喜欢将键和值分开，或者以其他方式传递 DataSnapshot .但是，如果您愿意，您也可以提取密钥 (DataSnapshot.getKey()) 并将其设置在您 @Exclude 的 Java 类中的属性上:

I prefer keeping the keys and the values separate, or otherwise passing the DataSnapshots around. But if you want, you can also extract the key (DataSnapshot.getKey()) and set it on a property in your Java class that you @Exclude:

public class Student {
  @Exclude
  public String key;
  public String name;
  public String age;
}

然后:

Student newStudent = snapshot.getValue(Student.class);
newStudent.key = snapshot.getKey();

相关:

• 如何管理 Firebase 数据库密钥?莉>
• 获取自定义对象 Firebase 中的引用和键安卓

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