Get data emty in ngmodel

Ionic Framework ionic-v3
1

Code HTML

 <div  *ngFor='let user of arrayUser'>
    <form (ngSubmit)="UpdateMe()" >

        <ion-item>
          <ion-label>Nom</ion-label>
          <ion-input type="text" [(ngModel)]="user.nom"  name='nom' ></ion-input>
        </ion-item>
        <ion-item>
          <ion-label>Prenom</ion-label>
          <ion-input [(ngModel)]="user.prenom" name="prenom"></ion-input>
        </ion-item>

 <ion-button ion-button type="submit" color='secondary' expand="full" block >Update</ion-button>
</form>
</div>

Code ts

import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Storage } from '@ionic/storage';
import { FormsModule } from '@angular/forms';
@Component({
  selector: 'app-update-user',
  templateUrl: './update-user.page.html',
  styleUrls: ['./update-user.page.scss'],
})
export class UpdateUserPage implements OnInit {

  constructor(
   private Http: HttpClient,
   private storage: Storage,


  ) { }
  apiUrl='xxxxxxxxxxxxxxxx/mobile/myName.php';
 
  arrayUser:any;
  nom:string='';
  user={};

  ngOnInit() {

    this.storage.get('id').then((val) => {
      

      this.Http.post(this.apiUrl,JSON.stringify(val)).subscribe(data=>{
       this.arrayUser=data;
       

      });
    });
  }


  UpdateMe(){  
    console.log(user);
  }


}

console.log(user) get data empty

2

on code.ts

if(user == null){
    console.log('User is empty)
}

on code.html

if user is not null show ion-item

<ion-item *ngIf="user">
 <p>user is not null</p>
</ion-item>