edit-article.component.ts:117 ERROR Error: NG01352: If ngModel is used within a form tag, either the name attribute must be set or the form

    control must be defined as 'standalone' in ngModelOptions.

    Example 1: <input [(ngModel)]="person.firstName" name="first">

    Example 2: <input [(ngModel)]="person.firstName" [ngModelOptions]="{standalone: true}">

<form #f="ngForm" (ngSubmit)="save_create()">

    <div *ngIf="article">

        <h1>Id:{{idarticle}}</h1>

        <input [(ngModel)]="article.title" name="title" placeholder="Title" style="width: 100%" />

        <button class="btn mat-raised-button btn-primary" [disabled]="!f.valid" >Save</button>

        <button (click)="delete_article(idarticle)" *ngIf="idarticle">Delete</button>

    </div>

</form>