DEV Community: zeeshan mehdi

Rules that i follow for clean Code

zeeshan mehdi — Tue, 28 Jun 2022 20:36:23 +0000

Avoid Switch Statements instead use polymorphysm so for example you have a class Shape and there are few children like triangle, circle so in future if you want to add new shape like rectangle you can just inherit it from Shape and you do not have to change anything in the base class.
Don't Pass more than three arguments instead pass an object
Don't pass a boolean to a function
Use functions inside if statements
Clearly name your folders, modules, functions, classes, object and variables in a way that easily understandable what they do.
Function has to do just one thing
Function should not have more than 2 indents, ideally no ident.
No side Effects ( for example if you open a file ,you should not leave it open but close it after you are done with it.)
Don't write any code inside try block instead just a function call.
Don't duplicate code convert them to reusable methods.

I will write part 2 to this post.

PHP Laravel authentication method unknown to the client [caching_sha2_password]

zeeshan mehdi — Thu, 22 Apr 2021 02:09:12 +0000

I am using laravel 5.8 and having MAMP server got this error resolved by adding DB_SOCKET=/Applications/MAMP/tmp/mysql/mysql.sock in .env file like below

DB_CONNECTION=mysql DB_HOST=127.0.0.1 DB_PORT=8889 DB_DATABASE=dbname DB_USERNAME=root DB_PASSWORD=root DB_SOCKET=/Applications/MAMP/tmp/mysql/mysql.sock

how to deploy Node js App to Cpanel or Shared Hosting

zeeshan mehdi — Sat, 09 Jan 2021 14:57:23 +0000

I have made a video which thoroughly explains the process of deploying node js app with MySQL database to cpanel

check video here

Flutter : Could not find a generator for route RouteSettings(“/somePage”, null) in the _WidgetsAppState

zeeshan mehdi — Sun, 27 Sep 2020 04:41:51 +0000

Solution 1 :

Use this:

Navigator.push(context, new MaterialPageRoute(
   builder: (context) => new MyHomePage())
 );

Instead of :

Navigator.of(context)
           .pushReplacementNamed('/somePage');

but in my case it did not fixed.

Let me explain what was problem in my case ,

I had navigation drawer and one of my route was going to a route which had another MaterialApp() Widget and after routing to that page if i route back to any other page it will through this exception. Do you know why ?

because the context was changed to new material app and i was trying to find that route inside new material app but obviously it was not present there.

Before

class App extends StatelessWidget {
  final UserAndManagement userAndManagement;
  App(this.userAndManagement);
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        fontFamily: "Varela",
        primaryColor: primaryMaterialColor
      ),
      home: HomePage(userAndManagement),
    );
  }
}

After

class App extends StatelessWidget {
  final UserAndManagement userAndManagement;
  App(this.userAndManagement);
  @override
  Widget build(BuildContext context) {
    return HomePage(userAndManagement);
  }
}

and You guess it worked for me like a charm !!!!

If you were facing the same problem it fixed it give this thumbs up.

Thanks

NOdejs MYSql Error: ER_TRUNCATED_WRONG_VALUE: Truncated incorrect DOUBLE value: 'admin1234'

zeeshan mehdi — Sat, 19 Sep 2020 13:57:45 +0000

Code causing issue

let query = `update users set email = ? and password = ? where id = ?`;
    console.log(query);
    connection.query(query,[id,email,pass], function(error, result, fields) {

        if (error) {
            console.log(`error ${error}`);
            callback(false);
        }else {
            console.log(result);
            if(result.affectedRows>0)
                callback(true);
            else
                callback(false);
        }
    });

solution : Just replace AND with comma

let query = `update users set email = ?,password = ? where id = ?`;
    console.log(query);
    connection.query(query,[id,email,pass], function(error, result, fields) {

        if (error) {
            console.log(`error ${error}`);
            callback(false);
        }else {
            console.log(result);
            if(result.affectedRows>0)
                callback(true);
            else
                callback(false);
        }
    });

Node js Left Join with limit and offset Mysql

zeeshan mehdi — Sat, 19 Sep 2020 08:14:47 +0000

I was having a scenario where i was required to add pagination to website without using any plugin so i started, i knew how to use limit and offset but with joins it was a problem so after searching around i found the solution here it is .

let query = `select audio.title as title, audio.artist ,audio.fileName, audio.date,album.title as albumtitle from audio   left join album on audio.album = album.id order by audio.id LIMIT 10 offset ${offset}`;
    console.log(query);
    connection.query(query, function(error, result, fields) {

        if (error) {
            console.log(`error ${error}`);
            callback(error, null);
        }else {
            console.log(result);
            callback('success', result);
        }
    });

result on console

select audio.title as title, audio.artist ,audio.fileName, audio.date,album.title as albumtitle from audio   left join album on audio.album = album.id order by audio.id LIMIT 10 offset 0
[
  RowDataPacket {
    title: 'Audio Title',
    artist: null,
    fileName: 'audio-1600246003244ha.mp3',
    date: 2020-09-16T08:46:43.000Z,
    albumtitle: 'Jal Pari'
  },
  RowDataPacket {
    title: 'Another audio',
    artist: null,
    fileName: 'audio-1600246030100gs.mp3',
    date: 2020-09-16T08:47:10.000Z,
    albumtitle: 'Jal Pari'
  },
  RowDataPacket {
    title: 'Some title',
    artist: null,
    fileName: 'audio-1600246129892gs.mp3',
    date: 2020-09-16T08:48:50.000Z,
    albumtitle: 'Jal Pari'
  },
  RowDataPacket {
    title: 'Upload Another',
    artist: null,
    fileName: 'audio-1600246160918la.mp3',
    date: 2020-09-16T08:49:21.000Z,
    albumtitle: null
  },
  RowDataPacket {
    title: 'Tere sang yaara',
    artist: 'Atif Aslam',
    fileName: 'audio-1600349287336an.mp3',
    date: 2020-09-17T13:28:07.000Z,
    albumtitle: null
  }
]

If it helped you make sure to give thumbs up. thanks

Uploading multiple files with multer, but from different fields Node JS

zeeshan mehdi — Thu, 17 Sep 2020 14:11:26 +0000

i was in a situation where i were to upload audio file along with a graphic for that particular song so i was to upload to different files an image and audio file so i used a way to do that using multer plugin available on link

var multer = require('multer')
var storage = multer.diskStorage({


destination: function(req, file, callback) {
    callback(null, './public/audio');
  },
  filename: function(req, file, callback) {
    console.log(file);
    if(file.originalname.length>6)
      callback(null, file.fieldname + '-' + Date.now() + file.originalname.substr(file.originalname.length-6,file.originalname.length));
    else
      callback(null, file.fieldname + '-' + Date.now() + file.originalname);

  }
});

const upload = multer({ storage: storage });


router.post('/save/audio',upload.fields([{
  name: 'audio', maxCount: 1
}, {
  name: 'graphic', maxCount: 1
}]) ,(req, res) => {

  const audioFile = req.files.audio[0];
  const audioGraphic = req.files.graphic[0];
  const fileName = req.body.title;


  saveAudio(fileName,audioFile.filename,audioGraphic.filename,req.body.artist,function (error,success) {
    req.flash('success','File Uploaded Successfully')

    res.redirect('/')
  });

})

how to send push notification to particular user using fcm (firebase Messaging) and Flutter

zeeshan mehdi — Mon, 13 Apr 2020 16:09:41 +0000

Notification Sending Side Using Dio flutter Library to make http post request

step1 : Get api key from firebase console under firebase messaging section or from project settings.

var postUrl = "fcm.googleapis.com/fcm/send";

        static Future<void> sendNotification(receiver,msg)async{

        var token = await getToken(receiver);
        print('token : $token');

        final data = {
          "notification": {"body": "Accept Ride Request", "title": "This is Ride Request"},
          "priority": "high",
          "data": {
            "click_action": "FLUTTER_NOTIFICATION_CLICK",
            "id": "1",
            "status": "done"
          },
          "to": "$token"
        };

        final headers = {
          'content-type': 'application/json',
          'Authorization': 'key=<Your firebase Messaging Api Key Get it from firebase project settings under cloud messaging section>'
        };


        BaseOptions options = new BaseOptions(
          connectTimeout: 5000,
          receiveTimeout: 3000,
          headers: headers,
        );


        try {
          final response = await Dio(options).post(postUrl,
              data: data);

          if (response.statusCode == 200) {
            Fluttertoast.showToast(msg: 'Request Sent To Driver');
          } else {
            print('notification sending failed');
            // on failure do sth
          }
        }
        catch(e){
          print('exception $e');
        }




      }

      static Future<String> getToken(userId)async{

        final Firestore _db = Firestore.instance;

        var token;
        await _db.collection('users')
            .document(userId)
            .collection('tokens').getDocuments().then((snapshot){
              snapshot.documents.forEach((doc){
                token = doc.documentID;
              });
        });

        return token;


      }


    //Now Receiving End 

        class _LoginPageState extends State<LoginPage>
        with SingleTickerProviderStateMixin {

      final Firestore _db = Firestore.instance;
      final FirebaseMessaging _fcm = FirebaseMessaging();

      StreamSubscription iosSubscription;



    //this code will go inside intiState function 

    if (Platform.isIOS) {
          iosSubscription = _fcm.onIosSettingsRegistered.listen((data) {
            // save the token  OR subscribe to a topic here
          });

          _fcm.requestNotificationPermissions(IosNotificationSettings());
        }
        _fcm.configure(
          onMessage: (Map<String, dynamic> message) async {
            print("onMessage: $message");
            showDialog(
              context: context,
              builder: (context) => AlertDialog(
                content: ListTile(
                  title: Text(message['notification']['title']),
                  subtitle: Text(message['notification']['body']),
                ),
                actions: <Widget>[
                  FlatButton(
                    child: Text('Ok'),
                    onPressed: () => Navigator.of(context).pop(),
                  ),
                ],
              ),
            );
          },
          onLaunch: (Map<String, dynamic> message) async {
            print("onLaunch: $message");
            // TODO optional
          },
          onResume: (Map<String, dynamic> message) async {
            print("onResume: $message");
            // TODO optional
          },
        );

//saving token while signing in or signing up
 _saveDeviceToken(uid) async {
    FirebaseUser user = await _auth.currentUser();

    // Get the token for this device
    String fcmToken = await _fcm.getToken();

    // Save it to Firestore
    if (fcmToken != null) {
      var tokens = _db
          .collection('users')
          .document(uid)
          .collection('tokens')
          .document(fcmToken);

      await tokens.setData({
        'token': fcmToken,
        'createdAt': FieldValue.serverTimestamp(), // optional
        'platform': Platform.operatingSystem // optional
      });
    }
  }

libs used firebase messaging, Dio for http request and firestore to store and retrieve fcm token.

I am new here

zeeshan mehdi — Fri, 10 Apr 2020 12:54:34 +0000

New Here ..