Question

我有一个“用户”集合，其注册方法如下：

public class UserHelper  {

    public static final String COLLECTION_NAME = "USERTABLE";

    public  static CollectionReference getUserCollection(){
        return FirebaseFirestore.getInstance().collection(COLLECTION_NAME);
    }

    public static Task<Void> createUser(String uid, String email, String password, String pseudo, String photo_url,boolean statut){
        Usermodele usermodele = new Usermodele(uid,email,password,pseudo,photo_url,statut);

        return UserHelper.getUserCollection().document(uid).set(usermodele);
    }

对于这个类，我想创建一个子集合“ AmisHelper”，我这样做是为了创建子集合，但是似乎有些事情没有进行。

public class AmiHelper {

    private static final String COLLECTION_NAME = "AMISCOLLECTION";

    public static CollectionReference getAmiCollection(){
        return FirebaseFirestore.getInstance().collection(COLLECTION_NAME);
    }

    public static Task<Void> createAmi(String idDemandeur, String idReceveur, String pseudo, String photo_url, String date_amitie){
        AmisModele amisModele = new AmisModele(idDemandeur,idReceveur,pseudo,photo_url,date_amitie);

        return UserHelper.getUserCollection().document(idDemandeur).collection("AMISCOLLECTION").document(idReceveur).set(amisModele);
    }

在使用时，我做到了

        holder.boutonAjouter.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(holder.itemView.getContext(), "clic position"+ position, Toast.LENGTH_SHORT).show();
             UserHelper.getUserCollection().document(uid).collection("AMISCOLLECTION").document(uid).set(uid,uid,"","","");
            }
        });

我可能做了一些异常的事情

当我点击“添加”按钮时，我有这个提示：

java.lang.IllegalArgumentException: Invalid data. Data must be a Map<String, Object> or a suitable POJO object, but it was of type: java.lang.String
        at com.google.firebase.firestore.UserDataReader.convertAndParseDocumentData(com.google.firebase:firebase-firestore@@21.4.1:234)
        at com.google.firebase.firestore.UserDataReader.parseSetData(com.google.firebase:firebase-firestore@@21.4.1:75)
        at com.google.firebase.firestore.DocumentReference.set(com.google.firebase:firebase-firestore@@21.4.1:166)
        at com.google.firebase.firestore.DocumentReference.set(com.google.firebase:firebase-firestore@@21.4.1:146)
        at com.google.firebase.firestore.CollectionReference.add(com.google.firebase:firebase-firestore@@21.4.1:121)
        at com.devolab.recapitulatif.adapter.TabAbonneAdapter$1.onClick(TabAbonneAdapter.java:79)
        at android.view.View.performClick(View.java:6256)
        at android.view.View$PerformClick.run(View.java:24697)
        at android.os.Handler.handleCallback(Handler.java:789)
        at android.os.Handler.dispatchMessage(Handler.java:98)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6541)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

Answer 1

您遇到以下错误：

java.lang.IllegalArgumentException：无效的数据。数据必须是Map或合适的POJO对象，但其类型为：java.lang.String

因为您正在尝试向文档中写入String值，但这实际上是不可能的。根据有关set() method parameters的官方文档：

要写入文档的数据（例如包含所需文档内容的Map或POJO）。

因此您无法简单地编写String，因此会出现该错误。要解决此问题，请将Map传递给set（）方法，该Map包含属性名称和该String的实际值作为键。模式应如下所示：

Firestore-root
   |
   --- USERTABLE (collection)
         |
         --- uid (document)
              |
              --- AMISCOLLECTION (collection)
                     |
                     --- uid (document)
                          |
                          --- fieldName: "StringValue"

您还可以使用POJO类的对象，就像在前两个共享示例中所做的那样。

在“用户”集合Cloud Firestore中创建一个朋友子集合

1 个答案: