insert.ts

@Component({
  selector: 'users',
  templateUrl: './users.component.html',
})
export class UserComponent implements OnInit {

  newUser: User;
  
  constructor(
    private userService: UserService
  ) { }

  ngOnInit() {
    this.newUser = User.CreateDefault();
  }
  
  insertUser() {
    this.userService
    .insertNewUser(this.newUser)
    .subscribe(
      data => {
         this.newUser._id = data.id;
         this.users.push(this.newUser);
         this.newUser = User.CreateDefault();
    
         console.log("Added user.");
      }
    )
  }
}