angular material multi select ngmodel
<mat-form-field>
<mat-select [compareWith]="compareFn" name="users" [(ngModel)]="users" multiple>
<mat-option *ngFor="let person of people" [value]="person">
{{ person.username }}
</mat-option>
</mat-select>
</mat-form-field>
compareFn(user1: User, user2: User) {
return user1 && user2 ? user1.id === user2.id : user1 === user2;
}
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