Error when import mongo_dart in the flutter

[SittiphanSittisak]

When I import the mongo_dart like:

import 'package:mongo_dart/mongo_dart.dart' as mongo;

I will get an error like this:

/C:/Users/username/AppData/Local/Pub/Cache/hosted/pub.dev/basic_utils-5.5.1/lib/src/library/crypto/rc2_engine.dart:4:1: Error: 'RC2Parameters' is imported from both 'package:basic_utils/src/library/crypto/rc2_parameters.dart' and 'package:pointycastle/api.dart'.
import 'package:pointycastle/export.dart';
^^^^^^^^^^^^^

basic code using mongo_dart: ^0.9.1:

import 'package:flutter/material.dart';
import 'package:mongo_dart/mongo_dart.dart' as mongo_test;

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also a layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

flutter doctor:

Doctor summary (to see all details, run flutter doctor -v):
[√] Flutter (Channel stable, 3.7.5, on Microsoft Windows [Version 10.0.19045.2728], locale th-TH)
[√] Windows Version (Installed version of Windows is version 10 or higher)      
[√] Android toolchain - develop for Android devices (Android SDK version 32.0.0)
[√] Chrome - develop for the web
[√] Visual Studio - develop for Windows (Visual Studio Community 2022 17.1.5)   
[√] Android Studio (version 2022.1)
[√] IntelliJ IDEA Community Edition (version 2022.2)
[√] VS Code (version 1.76.2)
[√] Connected device (3 available)
[√] HTTP Host Availability

• No issues found!

I must fix this error by editing at

C:\Users\username\AppData\Local\Pub\Cache\hosted\pub.dev\basic_utils-5.5.1\lib\src\library\crypto\rc2_engine.dart

from

import 'package:basic_utils/src/library/crypto/rc2_parameters.dart';

to

import 'package:basic_utils/src/library/crypto/rc2_parameters.dart' as crpto;

[marcellocamara]

Same problem here. Can't compile and I didn't upgrade any package.

[giorgiofran]

This is a problem of the basic_utils package. mongo_dart uses it, so it is also affected. I have seen that the maintainer of that package is aware of the problem and is going to release a new version. In the meanwhile, if you want to run your app you can override the dependecy adding the following lines in you pubspec:

dependency_overrides:
  basic_utils: 5.4.2

[tejHackerDEV]

Hi @giorgiofran, May i know from where you are getting references to develop this driver. Because i searched about documentation online to develop a mongoDB driver but failed to find the appropriate resources. If you would share the references it will be helpful also i can able to contribute to the project, if i can understand the things. Thank you

[giorgiofran]

Hi @giorgiofran, May i know from where you are getting references to develop this driver. Because i searched about documentation online to develop a mongoDB driver but failed to find the appropriate resources. If you would share the references it will be helpful also i can able to contribute to the project, if i can understand the things. Thank you

Mainly from the spefifications and also from the online manual

[SittiphanSittisak]

This issue was solved. Now, we don't need to override the basic_utils.