How to post multiple input fields to server as a json object

Ionic Framework ionic-v3
1

Hai there,
Iam relatively new to the ionic app development.
Now i am face a problem that,i need to send multiple input field which generate dynamically from the mysql php.
ie, i have a input field which i can be updated and send to the server that is my requirement.

Now i am able to get data from my server and generate the input field.but iam unable to send the (updated if any) to the server back

studentsscreenshot
studentsscreenshot.png1000×303 22.2 KB

here is the screenshot.

here is html template

type or paste code here
```  `<ion-list>
  <ion-item no-margin="">
  <ion-grid>
    <strong><ion-row>
      <ion-col>Student code</ion-col>
      <ion-col>name</ion-col>
      <ion-col>phone</ion-col>
    </ion-row>
    </strong>
  </ion-grid>
  </ion-item>
  <ion-grid>
    <ion-row *ngFor="let student of students">
      <ion-col >{{student.student_code}}</ion-col>
      <ion-col>{{student.full_name}}</ion-col>
      <ion-col ion-item=""><ion-input  maxlength="10" required [(ngModel)]="student.phone"></ion-input></ion-col>
    </ion-row>
  </ion-grid>
</ion-list>`


here is the .ts file

loadStudents(division){
this.rest.loadStudents(division)
.subscribe(data=>{
this.students=data;

  },error1 => {
    console.log(error1);
  });

}