🐛 [firebase_database] limitToFirst and limitToLast retrieve the whole data when using the .get() method

Tom3652 commented 2 years ago

Bug report

I am trying to perform a simple query :

DataSnapshot snapshot = await FirebaseDatabase.instance.reference().child("messages").child(uid).orderByChild("createdAt").limitToLast(1).get();

And i expect to retrieve only 1 result from the end of the list (ascending order). I have 5 messages under the messages node here, and the query returns them all instead of the more recent one only.

Same issue using limitToFirst(1) that retrieves all data under the messages node.

I have also tried using orderByChild which doesn't change anything.

Steps to reproduce

Steps to reproduce the behavior:

Run the sample code

Expected behavior

I expect the data to be sorted ascending and limited to 1 result when using :

DataSnapshot snapshot = await FirebaseDatabase.instance.reference().child("messages").orderByChild("createdAt").limitToFirst(1).get();

=> Output is unordered and definitely not with 1 item.

I expect the data to be limited to 1 result when using :

DataSnapshot snapshot = await FirebaseDatabase.instance.reference().child("messages").limitToLast(1).get();

=> Same.

With the sample code, the expected output would be message4 as content only.

Additional issue

The orderByChild method is also not working. I have set negative timestamps to the createdAt to be able to order by descending.
However, the orderByChild is not working, we can see (despite the limitToLast(1)) in the sample example the whole list of messages still unordered.

Sample project


import 'package:firebase_core/firebase_core.dart';
import 'package:firebase_database/firebase_database.dart';
import 'package:flutter/material.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(const TestApp());
}

class TestApp extends StatefulWidget {
  const TestApp({Key? key}) : super(key: key);

  @override
  _TestAppState createState() => _TestAppState();
}

class _TestAppState extends State<TestApp> {

  final List<Map<String, dynamic>> _messageList = [];

  void _writeMessages() async {
    for (int i = 0; i < 5; i++) {
      int time = DateTime.now().millisecondsSinceEpoch;
      FirebaseDatabase.instance.reference().child("messages").child(time.toString()).update({
        "createdAt": time,
        "content": "message$i"
      });
      await Future.delayed(const Duration(milliseconds: 50));
    }
  }

  void _sortMessagesDescendingWithLimit() async {
    DataSnapshot dataSnapshot = await FirebaseDatabase.instance.reference().child("messages").orderByChild("createdAt").limitToLast(1).get();
    Map<String, dynamic> result = Map<String, dynamic>.from(dataSnapshot.value);
    print("Result : $result");
    for (var element in result.values) {
      _messageList.add(Map<String, dynamic>.from(element));
    }
    setState(() {

    });
  }

  @override
  void initState() {
    super.initState();
    _writeMessages();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: _messageList.isNotEmpty ? ListView.builder(
          itemCount: _messageList.length,
            itemBuilder: (context, index) {
          return Padding(
            padding: const EdgeInsets.all(15),
            child: Column(
              children: [
                Text("Content : ${_messageList[index]["content"]}", style: const TextStyle(color: Colors.black)),
                const Padding(padding: EdgeInsets.only(top: 15)),
                Text("Date : ${DateTime.fromMillisecondsSinceEpoch(_messageList[index]["createdAt"])}", style: const TextStyle(color: Colors.black))
              ],
            ),
          );
        }) : Center(
          child: GestureDetector(
            onTap: _sortMessagesDescendingWithLimit,
            child: Container(
              width: 300,
              height: 300,
              color: Colors.blue,
              child: const Center(child: Text("Sort descending")),
            ),
          ),
        ),
      ),
    );
  }
}

Flutter doctor

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Run flutter pub deps -- --style=compact and paste the output below:

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emoji_picker_flutter 1.0.8 [flutter shared_preferences] - extended_image 5.1.3 [extended_image_library flutter meta] - extended_tabs 2.3.0 [flutter] - ffmpeg_kit_flutter 4.5.0 [ffmpeg_kit_flutter_platform_interface flutter] - firebase_analytics 8.3.4 [firebase_analytics_platform_interface firebase_analytics_web firebase_core flutter meta] - firebase_auth 3.2.0 [firebase_auth_platform_interface firebase_auth_web firebase_core firebase_core_platform_interface flutter meta] - firebase_core 1.10.0 [firebase_core_platform_interface firebase_core_web flutter meta] - firebase_crashlytics 2.3.0 [firebase_core firebase_core_platform_interface firebase_crashlytics_platform_interface flutter stack_trace] - firebase_database 8.1.0 [firebase_core firebase_database_platform_interface firebase_database_web flutter] - firebase_dynamic_links 3.0.1 [firebase_core flutter] - firebase_messaging 11.1.0 [firebase_core firebase_core_platform_interface firebase_messaging_platform_interface firebase_messaging_web flutter meta] - firebase_performance 0.7.1+4 [firebase_core firebase_core_platform_interface firebase_performance_platform_interface firebase_performance_web flutter] - firebase_storage 10.1.0 [firebase_core firebase_core_platform_interface firebase_storage_platform_interface firebase_storage_web flutter] - flutter 0.0.0 [characters collection meta typed_data vector_math sky_engine] - flutter_app_badger 1.3.0 [flutter] - flutter_arc_text 0.5.0 [characters flutter] - flutter_contacts 1.1.1+2 [flutter] - flutter_facebook_auth 3.5.6 [flutter flutter_facebook_auth_platform_interface flutter_facebook_auth_web] - flutter_image_compress 1.1.0 [flutter] - flutter_launcher_icons 0.9.2 [args image path yaml] - flutter_localizations 0.0.0 [flutter intl characters clock collection meta path typed_data vector_math] - flutter_sound_lite 8.4.2 [path_provider recase uuid provider path synchronized logger flutter flutter_sound_platform_interface flutter_sound_web] - flutter_staggered_grid_view 0.4.1 [flutter] - flutter_svg 0.23.0+1 [flutter meta path_drawing vector_math xml] - 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video_player 2.2.7 [flutter meta video_player_platform_interface video_player_web html] - video_thumbnail 0.4.3 [flutter] - visibility_detector 0.2.2 [flutter] dev dependencies: - flutter_lints 1.0.4 [lints] - flutter_test 0.0.0 [flutter test_api path fake_async clock stack_trace vector_math async boolean_selector characters charcode collection matcher meta source_span stream_channel string_scanner term_glyph typed_data] transitive dependencies: - archive 3.1.6 [crypto path] - args 2.3.0 - async 2.8.1 [collection meta] - boolean_selector 2.1.0 [source_span string_scanner] - cached_network_image_platform_interface 1.0.0 [flutter flutter_cache_manager] - cached_network_image_web 1.0.1 [flutter flutter_cache_manager cached_network_image_platform_interface] - camera_platform_interface 2.1.1 [cross_file flutter meta plugin_platform_interface stream_transform] - camera_web 0.2.1+1 [camera_platform_interface flutter flutter_web_plugins stream_transform] - characters 1.1.0 - charcode 1.3.1 - clock 1.1.0 - cloud_functions_platform_interface 5.0.14 [firebase_core flutter meta plugin_platform_interface] - cloud_functions_web 4.1.1 [cloud_functions_platform_interface firebase_core firebase_core_web flutter flutter_web_plugins js] - collection 1.15.0 - connectivity_plus_linux 1.1.1 [flutter connectivity_plus_platform_interface meta nm] - connectivity_plus_macos 1.2.1 [connectivity_plus_platform_interface flutter] - connectivity_plus_platform_interface 1.1.1 [flutter meta plugin_platform_interface] - connectivity_plus_web 1.1.0+1 [connectivity_plus_platform_interface flutter_web_plugins flutter] - connectivity_plus_windows 1.2.0 [connectivity_plus_platform_interface flutter] - cross_file 0.3.2 [flutter js meta] - csslib 0.17.1 [source_span] - dbus 0.6.6 [args ffi meta xml] - extended_image_library 3.1.0 [crypto flutter http_client_helper path path_provider] - fake_async 1.2.0 [clock collection] - ffi 1.1.2 - ffmpeg_kit_flutter_platform_interface 0.1.0 [flutter plugin_platform_interface] - file 6.1.2 [meta path] - 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firebase_messaging_platform_interface 3.0.9 [firebase_core flutter meta plugin_platform_interface] - firebase_messaging_web 2.1.0 [firebase_core firebase_core_web firebase_messaging_platform_interface flutter flutter_web_plugins js meta] - firebase_performance_platform_interface 0.0.1+7 [firebase_core flutter plugin_platform_interface] - firebase_performance_web 0.0.2 [firebase firebase_performance_platform_interface flutter flutter_web_plugins] - firebase_storage_platform_interface 4.0.6 [collection firebase_core flutter meta plugin_platform_interface] - firebase_storage_web 3.1.0 [async firebase_core firebase_core_web firebase_storage_platform_interface flutter flutter_web_plugins http js meta] - flutter_blurhash 0.6.0 [flutter meta pedantic] - flutter_cache_manager 3.1.3 [clock collection file flutter http path path_provider pedantic rxdart sqflite uuid] - flutter_facebook_auth_platform_interface 2.7.0 [flutter plugin_platform_interface] - flutter_facebook_auth_web 2.6.0+2 [flutter flutter_web_plugins js flutter_facebook_auth_platform_interface] - flutter_plugin_android_lifecycle 2.0.4 [flutter] - flutter_sound_platform_interface 8.4.2 [flutter meta plugin_platform_interface logger] - flutter_sound_web 8.4.2 [flutter_sound_platform_interface flutter logger flutter_web_plugins meta js] - flutter_web_plugins 0.0.0 [flutter js characters collection meta typed_data vector_math] - geocoding_platform_interface 2.0.1 [flutter meta plugin_platform_interface] - geolocator_android 2.1.0 [flutter geolocator_platform_interface] - geolocator_apple 1.2.2 [flutter geolocator_platform_interface] - geolocator_platform_interface 2.3.6 [flutter plugin_platform_interface vector_math meta] - geolocator_web 2.0.6 [flutter flutter_web_plugins geolocator_platform_interface] - google_maps_flutter_platform_interface 2.1.3 [collection flutter meta plugin_platform_interface stream_transform] - google_sign_in_platform_interface 2.1.0 [flutter meta quiver] - google_sign_in_web 0.10.0+3 [flutter flutter_web_plugins google_sign_in_platform_interface js meta] - graphs 2.1.0 [collection] - html 0.15.0 [csslib source_span] - http_client_helper 2.0.2 [http] - http_parser 4.0.0 [charcode collection source_span string_scanner typed_data] - image 3.0.8 [archive meta xml] - in_app_review_platform_interface 2.0.2 [flutter url_launcher plugin_platform_interface platform] - js 0.6.3 - lints 1.0.1 - matcher 0.12.10 [stack_trace] - meta 1.7.0 - mime 1.0.1 - modal_bottom_sheet 2.0.0 [flutter] - nested 1.0.0 [flutter] - nm 0.4.1 [dbus] - octo_image 1.0.0+1 [flutter flutter_blurhash] - path_drawing 0.5.1+1 [vector_math meta path_parsing flutter] - path_parsing 0.2.1 [vector_math meta] - path_provider_android 2.0.8 [flutter path_provider_platform_interface] - path_provider_ios 2.0.7 [flutter path_provider_platform_interface] - path_provider_linux 2.1.2 [flutter path path_provider_platform_interface xdg_directories] - path_provider_macos 2.0.3 [flutter] - path_provider_platform_interface 2.0.1 [flutter meta platform plugin_platform_interface] - path_provider_windows 2.0.4 [ffi flutter meta path path_provider_platform_interface win32] - pedantic 1.11.1 - permission_handler_platform_interface 3.7.0 [flutter meta plugin_platform_interface] - petitparser 4.4.0 [meta] - platform 3.0.2 - plugin_platform_interface 2.0.2 [meta] - process 4.2.4 [file path platform] - quiver 3.0.1+1 [matcher] - recase 4.0.0 - rxdart 0.27.2 - share_plus_linux 2.0.4 [share_plus_platform_interface file flutter meta url_launcher] - share_plus_macos 2.0.2 [share_plus_platform_interface flutter] - share_plus_platform_interface 2.0.1 [flutter meta mime plugin_platform_interface] - share_plus_web 2.0.4 [share_plus_platform_interface url_launcher flutter flutter_web_plugins meta] - share_plus_windows 2.0.3 [share_plus_platform_interface flutter meta url_launcher] - shared_preferences_android 2.0.8 [flutter meta shared_preferences_platform_interface] - shared_preferences_ios 2.0.8 [flutter meta shared_preferences_platform_interface] - shared_preferences_linux 2.0.3 [file flutter meta path path_provider_linux shared_preferences_platform_interface] - shared_preferences_macos 2.0.2 [flutter shared_preferences_platform_interface] - shared_preferences_platform_interface 2.0.0 [flutter] - shared_preferences_web 2.0.2 [flutter flutter_web_plugins meta shared_preferences_platform_interface] - shared_preferences_windows 2.0.3 [file flutter meta path path_provider_platform_interface path_provider_windows shared_preferences_platform_interface] - sky_engine 0.0.99 - source_span 1.8.1 [collection path term_glyph] - sqflite_common 2.0.1+1 [synchronized path meta] - stack_trace 1.10.0 [path] - stream_channel 2.1.0 [async] - stream_transform 2.0.0 - string_scanner 1.1.0 [charcode source_span] - synchronized 3.0.0 - term_glyph 1.2.0 - test_api 0.4.2 [async boolean_selector collection meta source_span stack_trace stream_channel string_scanner term_glyph matcher] - typed_data 1.3.0 [collection] - universal_platform 1.0.0+1 - url_launcher_linux 2.0.2 [flutter] - url_launcher_macos 2.0.2 [flutter] - url_launcher_platform_interface 2.0.4 [flutter plugin_platform_interface] - url_launcher_web 2.0.4 [flutter flutter_web_plugins meta url_launcher_platform_interface] - url_launcher_windows 2.0.2 [flutter] - vector_math 2.1.0 - video_player_platform_interface 4.2.0 [flutter flutter_test meta] - video_player_web 2.0.4 [flutter flutter_web_plugins meta video_player_platform_interface] - win32 2.3.0 [ffi] - xdg_directories 0.2.0 [meta path process] - xml 5.3.1 [collection meta petitparser] - yaml 3.1.0 [collection source_span string_scanner] ```

maheshj01 commented 2 years ago

Hi @Tom3652, Thanks for filing the issue. Could you please share the version of the database plugin and the structure of your database?

Thanks

Tom3652 commented 2 years ago

Hello @maheshmnj thanks for your reply. I am using : firebase_database: ^8.1.0

Here is a screenshot of my structure : Capture d’écran 2021-11-22 à 14 30 21

But as i wrote in my sample code, this doesn't seem to be related to my database structure => having a simple node with messages only can reproduce the issue, there is no limit nor order by :/

Please let me know if you need more specifications / details.

maheshj01 commented 2 years ago

Thanks for the info @Tom3652. I can reproduce the issue limitToFirst and limitToLast methods are not limiting the number of results to be returned it always returns the whole data.

  firebase_core: ^1.10.0
  firebase_database: ^8.1.0

flutter doctor -v

``` [✓] Flutter (Channel stable, 2.5.3, on macOS 12.0.1 21A559 darwin-arm, locale en-GB) • Flutter version 2.5.3 at /Users/mahesh/Documents/flutter • Upstream repository https://github.com/flutter/flutter.git • Framework revision 18116933e7 (6 weeks ago), 2021-10-15 10:46:35 -0700 • Engine revision d3ea636dc5 • Dart version 2.14.4 [✓] Android toolchain - develop for Android devices (Android SDK version 31.0.0) • Android SDK at /Users/mahesh/Library/Android/sdk • Platform android-31, build-tools 31.0.0 • ANDROID_HOME = /Users/mahesh/Library/Android/sdk • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264) • All Android licenses accepted. [✓] Xcode - develop for iOS and macOS • Xcode at /Applications/Xcode.app/Contents/Developer • Xcode 13.1, Build version 13A1030d • CocoaPods version 1.10.2 [✓] Chrome - develop for the web • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome [✓] Android Studio (version 4.2) • Android Studio at /Applications/Android Studio.app/Contents • Flutter plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/9212-flutter • Dart plugin can be installed from: 🔨 https://plugins.jetbrains.com/plugin/6351-dart • Java version OpenJDK Runtime Environment (build 11.0.8+10-b944.6916264) [✓] IntelliJ IDEA Community Edition (version 2021.2.1) • IntelliJ at /Applications/IntelliJ IDEA CE.app • Flutter plugin version 60.1.4 • Dart plugin version 212.5080.8 [✓] VS Code (version 1.61.2) • VS Code at /Applications/Visual Studio Code.app/Contents • Flutter extension version 3.28.0 [✓] Connected device (4 available) • Redmi K20 Pro (mobile) • 192.168.1.2:5555 • android-arm64 • Android 11 (API 30) • iPhone 12 mini (mobile) • 1FBDAEA9-D062-4831-AFEC-820D955D6D88 • ios • com.apple.CoreSimulator.SimRuntime.iOS-14-5 (simulator) • macOS (desktop) • macos • darwin-arm64 • macOS 12.0.1 21A559 darwin-arm • Chrome (web) • chrome • web-javascript • Google Chrome 96.0.4664.55 • No issues found! ```

Tom3652 commented 2 years ago

Thanks @maheshmnj for confirming :) Should i open another issue regarding the orderByChild as well ?

I am aware that there is an ongoing rework of this plugin and that it's still written in beta in the FlutterFire doc, so the team is probably aware of all these bugs as they are really "simple" use cases.

maheshj01 commented 2 years ago

@Tom3652 sure please.

Tom3652 commented 2 years ago

Alright my bad, it's the get method that returns a complete desordered results with orderByChild, but the once is working fine along with orderByChild. Since i don't know if this is a normal behavior for the get method, i will not make an issue for now :)

Tom3652 commented 2 years ago

I simply would like to specify that the issue only happens when using the .get() method. Fortunately i can use the .once() so i am not stuck anymore :)

Salakar commented 2 years ago

Are you able to try the latest plugin version and confirm if this is still an issue.

I have a feeling there's an underlying issue with this though on the official Firebase SDKs that we wrap - but would be good to confirm how the latest FlutterFire plugin version behaves - thanks

Tom3652 commented 2 years ago

I also confirm that it's working fine with the version : firebase_database: ^9.0.3.

However, i had to add an index to make it work, otherwise i got the below error :

I/RepoOperation( 3761): get for query /messages falling back to disk cache after error: Index not defined, add ".indexOn": "createdAt", for path "/messages", to the rules
E/firebase_database( 3761): An unknown error occurred handling native method call Query#get
E/firebase_database( 3761): java.util.concurrent.ExecutionException: java.lang.Exception: Index not defined, add ".indexOn": "createdAt", for path "/messages", to the rules
E/firebase_database( 3761):     at com.google.android.gms.tasks.Tasks.zza(com.google.android.gms:play-services-tasks@@17.2.1:5)
E/firebase_database( 3761):     at com.google.android.gms.tasks.Tasks.await(com.google.android.gms:play-services-tasks@@17.2.1:8)
E/firebase_database( 3761):     at io.flutter.plugins.firebase.database.FirebaseDatabasePlugin.lambda$queryGet$8$FirebaseDatabasePlugin(FirebaseDatabasePlugin.java:248)
E/firebase_database( 3761):     at io.flutter.plugins.firebase.database.FirebaseDatabasePlugin$$ExternalSyntheticLambda17.call(Unknown Source:4)
E/firebase_database( 3761):     at com.google.android.gms.tasks.zzx.run(com.google.android.gms:play-services-tasks@@17.2.1:1)
E/firebase_database( 3761):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
E/firebase_database( 3761):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
E/firebase_database( 3761):     at java.lang.Thread.run(Thread.java:919)
E/firebase_database( 3761): Caused by: java.lang.Exception: Index not defined, add ".indexOn": "createdAt", for path "/messages", to the rules
E/firebase_database( 3761):     at com.google.firebase.database.connection.PersistentConnectionImpl.lambda$get$0$PersistentConnectionImpl(PersistentConnectionImpl.java:426)
E/firebase_database( 3761):     at com.google.firebase.database.connection.PersistentConnectionImpl$$ExternalSyntheticLambda2.onResponse(Unknown Source:6)
E/firebase_database( 3761):     at com.google.firebase.database.connection.PersistentConnectionImpl$6.onResponse(PersistentConnectionImpl.java:1315)
E/firebase_database( 3761):     at com.google.firebase.database.connection.PersistentConnectionImpl.onDataMessage(PersistentConnectionImpl.java:513)
E/firebase_database( 3761):     at com.google.firebase.database.connection.Connection.onDataMessage(Connection.java:167)
E/firebase_database( 3761):     at com.google.firebase.database.connection.Connection.onMessage(Connection.java:131)
E/firebase_database( 3761):     at com.google.firebase.database.connection.WebsocketConnection.appendFrame(WebsocketConnection.java:259)
E/firebase_database( 3761):     at com.google.firebase.database.connection.WebsocketConnection.handleIncomingFrame(WebsocketConnection.java:306)
E/firebase_database( 3761):     at com.google.firebase.database.connection.WebsocketConnection.access$500(WebsocketConnection.java:34)
E/firebase_database( 3761):     at com.google.firebase.database.connection.WebsocketConnection$WSClientTubesock$2.run(WebsocketConnection.java:86)
E/firebase_database( 3761):     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
E/firebase_database( 3761):     at java.util.concurrent.FutureTask.run(FutureTask.java:266)
E/firebase_database( 3761):     at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:301)
E/firebase_database( 3761):     ... 3 more
E/flutter ( 3761): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: [firebase_database/index-not-defined] Index not defined, add ".indexOn": "createdAt", for path "/messages", to the rules
E/flutter ( 3761): 
E/flutter ( 3761): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:607:7)
E/flutter ( 3761): #1      MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:167:18)
E/flutter ( 3761): <asynchronous suspension>
E/flutter ( 3761): #2      MethodChannel.invokeMapMethod (package:flutter/src/services/platform_channel.dart:367:43)
E/flutter ( 3761): <asynchronous suspension>
E/flutter ( 3761): #3      MethodChannelQuery.get (package:firebase_database_platform_interface/src/method_channel/method_channel_query.dart:74:22)
E/flutter ( 3761): <asynchronous suspension>
E/flutter ( 3761): #4      Query.get (package:firebase_database/src/query.dart:21:27)
E/flutter ( 3761): <asynchronous suspension>
E/flutter ( 3761): #5      _TestAppState._sortMessagesDescendingWithLimit (package:testapp/test_fire.dart:37:33)
E/flutter ( 3761): <asynchronous suspension>
E/flutter ( 3761): 
E/flutter ( 3761): #0      MethodChannelQuery.get (package:firebase_database_platform_interface/src/method_channel/method_channel_query.dart:86:7)
E/flutter ( 3761): <asynchronous suspension>
E/flutter ( 3761): #1      Query.get (package:firebase_database/src/query.dart:21:27)
E/flutter ( 3761): <asynchronous suspension>
E/flutter ( 3761): #2      _TestAppState._sortMessagesDescendingWithLimit (package:testapp/test_fire.dart:37:33)
E/flutter ( 3761): <asynchronous suspension>

After adding the index as required it gives the wanted output.

Salakar commented 2 years ago

great thanks for confirming this is now working

firebase / flutterfire