我使用云数据库在Firebase中创建项目，并且我想将存储在文档中的empUID字段与当前UID进行比较。
我创建了一个查询，该查询在当前UID和empUID匹配但无法获取数据时获取数据。
请指导是我的查询权限，还是我需要更改代码
我的子收集路径
雇主（根集合）->职位发布（子集合）->求职者 详细信息（工作职位的子集合）
Logcat
2020-02-10 10:38:36.239 29836-29895/com.example.part_time_job I/Adreno: Build Config : S P 6.0.7 AArch64
2020-02-10 10:38:36.231 29836-29836/com.example.part_time_job W/RenderThread: type=1400 audit(0.0:9359): avc: denied { search } for name="proc" dev="debugfs" ino=16085 scontext=u:r:untrusted_app:s0:c183,c257,c512,c768 tcontext=u:object_r:qti_debugfs:s0 tclass=dir permissive=0
2020-02-10 10:38:36.242 29836-29895/com.example.part_time_job I/Adreno: PFP: 0x016ee180, ME: 0x00000000
2020-02-10 10:38:36.231 29836-29836/com.example.part_time_job W/RenderThread: type=1400 audit(0.0:9360): avc: denied { search } for name="ctx" dev="debugfs" ino=16114 scontext=u:r:untrusted_app:s0:c183,c257,c512,c768 tcontext=u:object_r:qti_debugfs:s0 tclass=dir permissive=0
2020-02-10 10:38:36.245 29836-29895/com.example.part_time_job I/ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0
2020-02-10 10:38:36.245 29836-29895/com.example.part_time_job I/ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasHDRDisplay retrieved: 0
2020-02-10 10:38:36.245 29836-29895/com.example.part_time_job D/libEGL: eglInitialize: exit(res=1)
2020-02-10 10:38:36.245 29836-29895/com.example.part_time_job I/OpenGLRenderer: Initialized EGL, version 1.4
2020-02-10 10:38:36.246 29836-29895/com.example.part_time_job D/OpenGLRenderer: Swap behavior 2
2020-02-10 10:38:36.241 29836-29836/com.example.part_time_job W/RenderThread: type=1400 audit(0.0:9361): avc: denied { search } for name="ctx" dev="debugfs" ino=16114 scontext=u:r:untrusted_app:s0:c183,c257,c512,c768 tcontext=u:object_r:qti_debugfs:s0 tclass=dir permissive=0
2020-02-10 10:38:36.369 29836-29894/com.example.part_time_job W/e.part_time_jo: Accessing hidden method Ljava/security/spec/ECParameterSpec;->setCurveName(Ljava/lang/String;)V (light greylist, reflection)
2020-02-10 10:38:36.391 29836-29894/com.example.part_time_job W/e.part_time_jo: Accessing hidden method Ldalvik/system/BlockGuard;->getThreadPolicy()Ldalvik/system/BlockGuard$Policy; (light greylist, linking)
2020-02-10 10:38:36.391 29836-29894/com.example.part_time_job W/e.part_time_jo: Accessing hidden method Ldalvik/system/BlockGuard$Policy;->onNetwork()V (light greylist, linking)
2020-02-10 10:38:37.656 29836-29836/com.example.part_time_job E/RecyclerView: No adapter attached; skipping layout
2020-02-10 10:38:38.262 29836-29836/com.example.part_time_job E/Register4: Received an exception FAILED_PRECONDITION: The query requires an index. You can create it here: https://console.firebase.google.com/v1/r/project/part-time-job-74d92/firestore/indexes?create_composite=Cmxwcm9qZWN0cy9wYXJ0LXRpbWUtam9iLTc0ZDkyL2RhdGFiYXNlcy8oZGVmYXVsdCkvY29sbGVjdGlvbkdyb3Vwcy9Kb2IgQXBwbGljYW50IERldGFpbHMvaW5kZXhlcy9DSUNBZ09qWGg0RUsQAhoKCgZlbXBVSUQQARoKCgZ1c2VySWQQARoMCghfX25hbWVfXxAB
2020-02-10 10:38:38.263 29836-29877/com.example.part_time_job W/Firestore: (21.3.1) [Firestore]: Listen for Query(target=Query( collectionGroup=Job Applicant Details where userId == uOQXpA8WSgWb5DeDqXxLsdEz0G22 and empUID == null order by __name__);limitType=LIMIT_TO_FIRST) failed: Status{code=FAILED_PRECONDITION, description=The query requires an index. You can create it here: https://console.firebase.google.com/v1/r/project/part-time-job-74d92/firestore/indexes?create_composite=Cmxwcm9qZWN0cy9wYXJ0LXRpbWUtam9iLTc0ZDkyL2RhdGFiYXNlcy8oZGVmYXVsdCkvY29sbGVjdGlvbkdyb3Vwcy9Kb2IgQXBwbGljYW50IERldGFpbHMvaW5kZXhlcy9DSUNBZ09qWGg0RUsQAhoKCgZlbXBVSUQQARoKCgZ1c2VySWQQARoMCghfX25hbWVfXxAB, cause=null}
2020-02-10 10:38:41.232 29836-29870/com.example.part_time_job V/FA: Inactivity, disconnecting from the service
我的Java代码
package com.example.part_time_job;
import android.location.Address;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.firestore.CollectionReference;
import com.google.firebase.firestore.DocumentSnapshot;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.QueryDocumentSnapshot;
import com.google.firebase.firestore.QuerySnapshot;
import java.util.ArrayList;
import java.util.List;
import model.FInalApplyNotification;
import model.Jobpost;
import ui.JournalRecyclerAdapterNotificationEmp;
import util.JournalApi;
/**
* A simple {@link Fragment} subclass.
*/
public class HistoryFragment extends Fragment {
private static final String TAG = "Register4";
private FirebaseUser user;
private FirebaseAuth firebaseAuth;
private FirebaseAuth.AuthStateListener authStateListener;
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private List<FInalApplyNotification> journalList;
private String empid;
private String title;
private String currentUserId;
private RecyclerView recyclerViewnotifyemp;
private JournalRecyclerAdapterNotificationEmp journalRecyclerAdapterNotificationEmp;
private CollectionReference collectionReference=db.collection("Employer");
private TextView no_listnotifyemp;
public HistoryFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view=inflater.inflate(R.layout.fragment_history, container, false);
firebaseAuth= FirebaseAuth.getInstance();
user =firebaseAuth.getCurrentUser();
no_listnotifyemp= view.findViewById(R.id.no_listnotifyemp);
journalList=new ArrayList<>();
recyclerViewnotifyemp=view.findViewById(R.id.recyclerViewnotifyemp);
recyclerViewnotifyemp.setHasFixedSize(true);
recyclerViewnotifyemp.setLayoutManager(new LinearLayoutManager(getActivity()));
currentUserId=JournalApi.getInstance().getUserId();
return view;
}
@Override
public void onStart() {
super.onStart();
if (journalList!=null){
journalList.clear();
}
FInalApplyNotification fInalApplyNotification=new FInalApplyNotification();
fInalApplyNotification.setTitle(title);
fInalApplyNotification.setUserId(currentUserId);
db.collectionGroup("Job Applicant Details").whereEqualTo("userId",currentUserId).whereEqualTo("empUID",fInalApplyNotification.getEmpUID())
.get()
.addOnSuccessListener(new OnSuccessListener<QuerySnapshot>() {
@Override
public void onSuccess(QuerySnapshot queryDocumentSnapshots) {
if (!queryDocumentSnapshots.isEmpty()) {
for (QueryDocumentSnapshot journals : queryDocumentSnapshots) {
FInalApplyNotification fInalApplyNotification = journals.toObject(FInalApplyNotification.class);
journalList.add(fInalApplyNotification);
}
journalRecyclerAdapterNotificationEmp = new JournalRecyclerAdapterNotificationEmp(getActivity(), journalList);
recyclerViewnotifyemp.setAdapter(journalRecyclerAdapterNotificationEmp);
journalRecyclerAdapterNotificationEmp.notifyDataSetChanged();
} else {
no_listnotifyemp.setVisibility(View.VISIBLE);
}
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.e(TAG, "Received an exception " + e.getMessage() );
}
});
}
}
我的查询
db.collectionGroup("Job Applicant Details").whereEqualTo("userId",currentUserId).whereEqualTo("empUID",fInalApplyNotification.getEmpUID())
答案 0 :(得分：1)
作为例外情况，您必须为正在执行的查询创建索引。
FAILED_PRECONDITION：查询需要索引。您可以在这里创建它：{some link}
由异常提供的链接在输入到浏览器后将为Firebase控制台加载创建查询所需索引所需的所有详细信息。因此，您只需要访问链接并按照说明进行操作即可。
答案 1 :(得分：1)
Firebase Firestore主要有两种查询类型
FirebaseFirestore.getInstance().collection("cities")
.whereEqualTo("capital", true)
.get()
.addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
@Override
public void onComplete(@NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (QueryDocumentSnapshot document : task.getResult()) {
Log.d(TAG, document.getId() + " => " + document.getData());
}
} else {
Log.d(TAG, "Error getting documents: ", task.getException());
}
}
});